Details
-
Bug
-
Status: Closed
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Critical
-
Resolution: Fixed
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6.5.0, 6.5.1, 6.6.0
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6.6.0-7880-enterprise
couchbase-transactions-1.1.0-SNAPSHOT.jar
java-client-3.0.6-SNAPSHOT.jar
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Untriaged
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Centos 64-bit
-
-
1
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No
Description
Build: 6.6.0-7880-enterprise
Scenario:
- 4 node cluster, Couchbase bucket (replica=2)
- Rebalance out 1 node from the cluster
- Initiate transaction in parallel to rebalance_out operation
+----------------+-----------------+--------------+| Nodes | Services | Status |+----------------+-----------------+--------------+| 172.23.107.52 | index, kv, n1ql | Cluster node || 172.23.123.101 | kv | --- OUT ---> || 172.23.123.102 | kv | Cluster node || 172.23.123.100 | kv | Cluster node |+----------------+-----------------+--------------+
Observation:
Seeing rebalance failure followed by memcached crash on master node - 172.23.107.52
Service 'memcached' exited with status 134. Restarting. Messages:
|
2020-07-14T23:30:54.406403-07:00 CRITICAL /opt/couchbase/bin/../lib/libstdc++.so.6() [0x7f2e4bcfd000+0x8f213]
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2020-07-14T23:30:54.406414-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xccc10]
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2020-07-14T23:30:54.406426-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xc805a]
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2020-07-14T23:30:54.406434-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xca463]
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2020-07-14T23:30:54.406441-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0x18f5a0]
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2020-07-14T23:30:54.406447-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xcf98d]
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2020-07-14T23:30:54.406454-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0x12b864]
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2020-07-14T23:30:54.406459-07:00 CRITICAL /opt/couchbase/bin/../lib/libplatform_so.so.0.1.0() [0x7f2e4ddac000+0x8f17]
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2020-07-14T23:30:54.406467-07:00 CRITICAL /lib64/libpthread.so.0() [0x7f2e4b5c8000+0x7dd5]
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2020-07-14T23:30:54.406499-07:00 CRITICAL /lib64/libc.so.6(clone+0x6d) [0x7f2e4b1fb000+0xfdead]
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|
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Rebalance exited with reason {mover_crashed,
|
{unexpected_exit,
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{'EXIT',<0.6670.0>,
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{{{{{child_interrupted,
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{'EXIT',<17502.2478.0>,socket_closed}},
|
[{dcp_replicator,spawn_and_wait,1,
|
[{file,"src/dcp_replicator.erl"}, {line,266}]},
|
{dcp_replicator,handle_call,3,
|
[{file,"src/dcp_replicator.erl"}, {line,121}]},
|
{gen_server,try_handle_call,4,
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[{file,"gen_server.erl"},{line,636}]},
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{gen_server,handle_msg,6,
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[{file,"gen_server.erl"},{line,665}]},
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{proc_lib,init_p_do_apply,3,
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[{file,"proc_lib.erl"},{line,247}]}]},
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{gen_server,call,
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[<17502.2476.0>,get_partitions,infinity]}},
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{gen_server,call,
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['dcp_replication_manager-default',
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{get_replicator_pid,543}, infinity]}},
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{gen_server,call,
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[{'janitor_agent-default',
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'ns_1@172.23.123.102'},
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{if_rebalance,<0.3620.0>,
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{update_vbucket_state,979,active,paused, undefined,
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[['ns_1@172.23.123.102', 'ns_1@172.23.123.101', 'ns_1@172.23.107.52']]}},
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infinity]}}}}}.
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Rebalance Operation Id = 322d92a2335598e144eb0bb97f14f1a3
|
|
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Worker <0.6325.0> (for action {move,{979,
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['ns_1@172.23.123.102',
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'ns_1@172.23.123.101',
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'ns_1@172.23.107.52'],
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['ns_1@172.23.107.52',
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'ns_1@172.23.123.100',
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'ns_1@172.23.123.102'],
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[]}}) exited with reason {unexpected_exit,
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{'EXIT', <0.6670.0>,
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{{{{{child_interrupted,
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{'EXIT', <17502.2478.0>, socket_closed}},
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[{dcp_replicator, spawn_and_wait, 1,
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[{file, "src/dcp_replicator.erl"}, {line, 266}]},
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{dcp_replicator, handle_call, 3,
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[{file, "src/dcp_replicator.erl"}, {line, 121}]},
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{gen_server, try_handle_call, 4,
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[{file, "gen_server.erl"}, {line, 636}]},
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{gen_server, handle_msg, 6,
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[{file, "gen_server.erl"}, {line, 665}]},
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{proc_lib, init_p_do_apply, 3,
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[{file, "proc_lib.erl"}, {line, 247}]}]},
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{gen_server, call,
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[<17502.2476.0>,
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get_partitions, infinity]}},
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{gen_server, call,
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['dcp_replication_manager-default',
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{get_replicator_pid, 543}, infinity]}},
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{gen_server, call,
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[{'janitor_agent-default',
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'ns_1@172.23.123.102'},
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{if_rebalance, <0.3620.0>,
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{update_vbucket_state,
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979, active, paused, undefined,
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[['ns_1@172.23.123.102',
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'ns_1@172.23.123.101',
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'ns_1@172.23.107.52']]}},
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infinity]}}}}
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Test to run:
Atomicity.doc_isolation.IsolationDocTest.test_transaction_with_rebalance,nodes_init=4,replicas=2,num_items=20000,rebalance_type=out,nodes_out=1,doc_op=create,durability=PERSIST_TO_MAJORITY,services_init=kv;n1ql;index,rerun=False
|
Attachments
Activity
| Field | Original Value | New Value |
|---|---|---|
| Description |
*Build*: 6.6.0-7880-enterprise
*Scenario*: * 4 node cluster, Couchbase bucket (replica=2) * Rebalance out 1 node from the cluster * Initiate transaction in parallel to rebalance_out operation {noformat} +----------------+-----------------+--------------+ | Nodes | Services | Status | +----------------+-----------------+--------------+ | 172.23.107.52 | index, kv, n1ql | Cluster node | | 172.23.123.101 | kv | --- OUT ---> | | 172.23.123.102 | kv | Cluster node | | 172.23.123.100 | kv | Cluster node | +----------------+-----------------+--------------+{noformat} *Observation:* Seeing rebalance failure followed by memcached crash on master node {noformat} Service 'memcached' exited with status 134. Restarting. Messages: 2020-07-14T23:30:54.406403-07:00 CRITICAL /opt/couchbase/bin/../lib/libstdc++.so.6() [0x7f2e4bcfd000+0x8f213] 2020-07-14T23:30:54.406414-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xccc10] 2020-07-14T23:30:54.406426-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xc805a] 2020-07-14T23:30:54.406434-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xca463] 2020-07-14T23:30:54.406441-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0x18f5a0] 2020-07-14T23:30:54.406447-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xcf98d] 2020-07-14T23:30:54.406454-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0x12b864] 2020-07-14T23:30:54.406459-07:00 CRITICAL /opt/couchbase/bin/../lib/libplatform_so.so.0.1.0() [0x7f2e4ddac000+0x8f17] 2020-07-14T23:30:54.406467-07:00 CRITICAL /lib64/libpthread.so.0() [0x7f2e4b5c8000+0x7dd5] 2020-07-14T23:30:54.406499-07:00 CRITICAL /lib64/libc.so.6(clone+0x6d) [0x7f2e4b1fb000+0xfdead] Rebalance exited with reason {mover_crashed, {unexpected_exit, {'EXIT',<0.6670.0>, {{{{{child_interrupted, {'EXIT',<17502.2478.0>,socket_closed}}, [{dcp_replicator,spawn_and_wait,1, [{file,"src/dcp_replicator.erl"}, {line,266}]}, {dcp_replicator,handle_call,3, [{file,"src/dcp_replicator.erl"}, {line,121}]}, {gen_server,try_handle_call,4, [{file,"gen_server.erl"},{line,636}]}, {gen_server,handle_msg,6, [{file,"gen_server.erl"},{line,665}]}, {proc_lib,init_p_do_apply,3, [{file,"proc_lib.erl"},{line,247}]}]}, {gen_server,call, [<17502.2476.0>,get_partitions,infinity]}}, {gen_server,call, ['dcp_replication_manager-default', {get_replicator_pid,543}, infinity]}}, {gen_server,call, [{'janitor_agent-default', 'ns_1@172.23.123.102'}, {if_rebalance,<0.3620.0>, {update_vbucket_state,979,active,paused, undefined, [['ns_1@172.23.123.102', 'ns_1@172.23.123.101', 'ns_1@172.23.107.52']]}}, infinity]}}}}}. Rebalance Operation Id = 322d92a2335598e144eb0bb97f14f1a3 Worker <0.6325.0> (for action {move,{979, ['ns_1@172.23.123.102', 'ns_1@172.23.123.101', 'ns_1@172.23.107.52'], ['ns_1@172.23.107.52', 'ns_1@172.23.123.100', 'ns_1@172.23.123.102'], []}}) exited with reason {unexpected_exit, {'EXIT', <0.6670.0>, {{{{{child_interrupted, {'EXIT', <17502.2478.0>, socket_closed}}, [{dcp_replicator, spawn_and_wait, 1, [{file, "src/dcp_replicator.erl"}, {line, 266}]}, {dcp_replicator, handle_call, 3, [{file, "src/dcp_replicator.erl"}, {line, 121}]}, {gen_server, try_handle_call, 4, [{file, "gen_server.erl"}, {line, 636}]}, {gen_server, handle_msg, 6, [{file, "gen_server.erl"}, {line, 665}]}, {proc_lib, init_p_do_apply, 3, [{file, "proc_lib.erl"}, {line, 247}]}]}, {gen_server, call, [<17502.2476.0>, get_partitions, infinity]}}, {gen_server, call, ['dcp_replication_manager-default', {get_replicator_pid, 543}, infinity]}}, {gen_server, call, [{'janitor_agent-default', 'ns_1@172.23.123.102'}, {if_rebalance, <0.3620.0>, {update_vbucket_state, 979, active, paused, undefined, [['ns_1@172.23.123.102', 'ns_1@172.23.123.101', 'ns_1@172.23.107.52']]}}, infinity]}}}}{noformat} |
*Build*: 6.6.0-7880-enterprise
*Scenario*: * 4 node cluster, Couchbase bucket (replica=2) * Rebalance out 1 node from the cluster * Initiate transaction in parallel to rebalance_out operation {noformat} +----------------+-----------------+--------------+ | Nodes | Services | Status | +----------------+-----------------+--------------+ | 172.23.107.52 | index, kv, n1ql | Cluster node | | 172.23.123.101 | kv | --- OUT ---> | | 172.23.123.102 | kv | Cluster node | | 172.23.123.100 | kv | Cluster node | +----------------+-----------------+--------------+{noformat} *Observation:* Seeing rebalance failure followed by memcached crash on master node - 172.23.107.52 {noformat} Service 'memcached' exited with status 134. Restarting. Messages: 2020-07-14T23:30:54.406403-07:00 CRITICAL /opt/couchbase/bin/../lib/libstdc++.so.6() [0x7f2e4bcfd000+0x8f213] 2020-07-14T23:30:54.406414-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xccc10] 2020-07-14T23:30:54.406426-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xc805a] 2020-07-14T23:30:54.406434-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xca463] 2020-07-14T23:30:54.406441-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0x18f5a0] 2020-07-14T23:30:54.406447-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xcf98d] 2020-07-14T23:30:54.406454-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0x12b864] 2020-07-14T23:30:54.406459-07:00 CRITICAL /opt/couchbase/bin/../lib/libplatform_so.so.0.1.0() [0x7f2e4ddac000+0x8f17] 2020-07-14T23:30:54.406467-07:00 CRITICAL /lib64/libpthread.so.0() [0x7f2e4b5c8000+0x7dd5] 2020-07-14T23:30:54.406499-07:00 CRITICAL /lib64/libc.so.6(clone+0x6d) [0x7f2e4b1fb000+0xfdead] Rebalance exited with reason {mover_crashed, {unexpected_exit, {'EXIT',<0.6670.0>, {{{{{child_interrupted, {'EXIT',<17502.2478.0>,socket_closed}}, [{dcp_replicator,spawn_and_wait,1, [{file,"src/dcp_replicator.erl"}, {line,266}]}, {dcp_replicator,handle_call,3, [{file,"src/dcp_replicator.erl"}, {line,121}]}, {gen_server,try_handle_call,4, [{file,"gen_server.erl"},{line,636}]}, {gen_server,handle_msg,6, [{file,"gen_server.erl"},{line,665}]}, {proc_lib,init_p_do_apply,3, [{file,"proc_lib.erl"},{line,247}]}]}, {gen_server,call, [<17502.2476.0>,get_partitions,infinity]}}, {gen_server,call, ['dcp_replication_manager-default', {get_replicator_pid,543}, infinity]}}, {gen_server,call, [{'janitor_agent-default', 'ns_1@172.23.123.102'}, {if_rebalance,<0.3620.0>, {update_vbucket_state,979,active,paused, undefined, [['ns_1@172.23.123.102', 'ns_1@172.23.123.101', 'ns_1@172.23.107.52']]}}, infinity]}}}}}. Rebalance Operation Id = 322d92a2335598e144eb0bb97f14f1a3 Worker <0.6325.0> (for action {move,{979, ['ns_1@172.23.123.102', 'ns_1@172.23.123.101', 'ns_1@172.23.107.52'], ['ns_1@172.23.107.52', 'ns_1@172.23.123.100', 'ns_1@172.23.123.102'], []}}) exited with reason {unexpected_exit, {'EXIT', <0.6670.0>, {{{{{child_interrupted, {'EXIT', <17502.2478.0>, socket_closed}}, [{dcp_replicator, spawn_and_wait, 1, [{file, "src/dcp_replicator.erl"}, {line, 266}]}, {dcp_replicator, handle_call, 3, [{file, "src/dcp_replicator.erl"}, {line, 121}]}, {gen_server, try_handle_call, 4, [{file, "gen_server.erl"}, {line, 636}]}, {gen_server, handle_msg, 6, [{file, "gen_server.erl"}, {line, 665}]}, {proc_lib, init_p_do_apply, 3, [{file, "proc_lib.erl"}, {line, 247}]}]}, {gen_server, call, [<17502.2476.0>, get_partitions, infinity]}}, {gen_server, call, ['dcp_replication_manager-default', {get_replicator_pid, 543}, infinity]}}, {gen_server, call, [{'janitor_agent-default', 'ns_1@172.23.123.102'}, {if_rebalance, <0.3620.0>, {update_vbucket_state, 979, active, paused, undefined, [['ns_1@172.23.123.102', 'ns_1@172.23.123.101', 'ns_1@172.23.107.52']]}}, infinity]}}}}{noformat} |
On 172.23.123.100 seeing:
2020-07-14T23:28:33.404296-07:00 ERROR 62: (default) DCP (Producer) eq_dcpq:replication:ns_1@172.23.123.100->ns_1@172.23.123.102:default - DcpProducer::handleResponse disconnecting, received unexpected response:{"bodylen":0,"cas":0,"datatype":"raw","extlen":0,"keylen":0,"magic":"ClientResponse","opaque":150,"opcode":"DCP_COMMIT","status":"Not found"}
|
2020-07-14T23:28:35.202402-07:00 ERROR 55: (default) DCP (Producer) eq_dcpq:replication:ns_1@172.23.123.100->ns_1@172.23.123.102:default - DcpProducer::handleResponse disconnecting, received unexpected response:{"bodylen":0,"cas":0,"datatype":"raw","extlen":0,"keylen":0,"magic":"ClientResponse","opaque":22,"opcode":"DCP_COMMIT","status":"Not found"}
|
On 172.23.123.101 seeing:
2020-07-14T23:30:47.535475-07:00 ERROR (default) VBucket::commit (vb:164) failed as no HashTable item found with key:<ud>cid:0x0:test_docs-00020907</ud> prepare_seqno:29, commit_seqno: 30
|
2020-07-14T23:30:49.888694-07:00 ERROR (default) VBucket::commit (vb:164) failed as no HashTable item found with key:<ud>cid:0x0:test_docs-00020907</ud> prepare_seqno:29, commit_seqno: 30
|
On 172.23.123.102 seeing:
2020-07-14T23:28:33.404193-07:00 ERROR (default) VBucket::commit (vb:489) failed as no HashTable item found with key:<ud>cid:0x0:test_docs-00006681</ud> prepare_seqno:3, commit_seqno: 4
|
2020-07-14T23:28:35.167405-07:00 ERROR (default) VBucket::commit (vb:309) failed as no HashTable item found with key:<ud>cid:0x0:test_docs-00026690</ud> prepare_seqno:3, commit_seqno: 4
|
2020-07-14T23:28:35.194229-07:00 ERROR 55: exception occurred in runloop during packet execution. Cookie info: [{"aiostat":"success","connection":"[ 127.0.0.1:44227 - 127.0.0.1:11209 (<ud>@ns_server</ud>) ]","engine_storage":"0x00007fcc15e6c210","ewouldblock":false,"packet":{"bodylen":34,"cas":0,"datatype":"raw","extlen":16,"key":"<ud>test_docs-00006681</ud>","keylen":18,"magic":"ClientRequest","opaque":155,"opcode":"DCP_COMMIT","vbucket":489},"refcount":1}] - closing connection ([ 127.0.0.1:44227 - 127.0.0.1:11209 (<ud>@ns_server</ud>) ]): PassiveDurabilityMonitor::completeSyncWrite vb:489 Pending resolution for 'SW @0x7fcc160b4e50 qi:[key:'<ud>cid:0x0:test_docs-00006681</ud>' seqno:3 reqs:{persist_to_majority, timeout=infinite}] status:Pending', but received unexpected commit for key <ud>cid:0x0:test_docs-00006681</ud> different prepare seqno: 5
|
2020-07-14T23:28:39.958943-07:00 ERROR 56: exception occurred in runloop during packet execution. Cookie info: [{"aiostat":"success","connection":"[ 127.0.0.1:42668 - 127.0.0.1:11209 (<ud>@ns_server</ud>) ]","engine_storage":"0x00007fcc15e70310","ewouldblock":false,"packet":{"bodylen":39,"cas":1594794515272695808,"datatype":"raw","extlen":21,"key":"<ud>test_docs-00026690</ud>","keylen":18,"magic":"ClientRequest","opaque":24,"opcode":"DCP_DELETION","vbucket":309},"refcount":1}] - closing connection ([ 127.0.0.1:42668 - 127.0.0.1:11209 (<ud>@ns_server</ud>) ]): PassiveDurabilityMonitor::completeSyncWrite vb:309 Pending resolution for 'SW @0x7fcc15eb9050 qi:[key:'<ud>cid:0x0:test_docs-00026690</ud>' seqno:3 reqs:{persist_to_majority, timeout=infinite}] status:Pending', but received unexpected commit for key <ud>cid:0x0:test_docs-00026690</ud> different prepare seqno: 5
|
2020-07-14T23:28:44.960641-07:00 ERROR 56: exception occurred in runloop during packet execution. Cookie info: [{"aiostat":"success","connection":"[ 127.0.0.1:33903 - 127.0.0.1:11209 (<ud>@ns_server</ud>) ]","engine_storage":"0x00007fcc15e6d610","ewouldblock":false,"packet":{"bodylen":39,"cas":1594794515272695808,"datatype":"raw","extlen":21,"key":"<ud>test_docs-00026690</ud>","keylen":18,"magic":"ClientRequest","opaque":24,"opcode":"DCP_DELETION","vbucket":309},"refcount":1}] - closing connection ([ 127.0.0.1:33903 - 127.0.0.1:11209 (<ud>@ns_server</ud>) ]): PassiveDurabilityMonitor::completeSyncWrite vb:309 Pending resolution for 'SW @0x7fcc15eb9050 qi:[key:'<ud>cid:0x0:test_docs-00026690</ud>' seqno:3 reqs:{persist_to_majority, timeout=infinite}] status:Pending', but received unexpected commit for key <ud>cid:0x0:test_docs-00026690</ud> different prepare seqno: 5
|
| Assignee | Daniel Owen [ owend ] | Ben Huddleston [ ben.huddleston ] |
| Due Date | 20/Jul/20 |
Nothing stands out in the logs here as an obvious cause.
I found vBucket 489 and 309 had errors on node 102. Both had some slightly odd looking vBucket state changes before the errors but they were deleted and recreated before things went wrong.
On node 101 vBucket 164 had the same error without the state changes, the only interesting thing was that a stream was made, nothing was received, then recreated before the crash.
I refreshed my understanding of the Stream/VBucket durability code but nothing is jumping out as the obvious cause for this (no HashTable item for commit). Interesting note is that these crashes look to be from purely memory streams (i.e. no disk backfills).
*Update*
While trying to collect logs, noticed a TAF task related issue.
Fixed using http://review.couchbase.org/c/TAF/+/132654 and restarted the failed jobs again.
Will collect logs if we see the same failure again.
| Description |
*Build*: 6.6.0-7880-enterprise
*Scenario*: * 4 node cluster, Couchbase bucket (replica=2) * Rebalance out 1 node from the cluster * Initiate transaction in parallel to rebalance_out operation {noformat} +----------------+-----------------+--------------+ | Nodes | Services | Status | +----------------+-----------------+--------------+ | 172.23.107.52 | index, kv, n1ql | Cluster node | | 172.23.123.101 | kv | --- OUT ---> | | 172.23.123.102 | kv | Cluster node | | 172.23.123.100 | kv | Cluster node | +----------------+-----------------+--------------+{noformat} *Observation:* Seeing rebalance failure followed by memcached crash on master node - 172.23.107.52 {noformat} Service 'memcached' exited with status 134. Restarting. Messages: 2020-07-14T23:30:54.406403-07:00 CRITICAL /opt/couchbase/bin/../lib/libstdc++.so.6() [0x7f2e4bcfd000+0x8f213] 2020-07-14T23:30:54.406414-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xccc10] 2020-07-14T23:30:54.406426-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xc805a] 2020-07-14T23:30:54.406434-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xca463] 2020-07-14T23:30:54.406441-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0x18f5a0] 2020-07-14T23:30:54.406447-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xcf98d] 2020-07-14T23:30:54.406454-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0x12b864] 2020-07-14T23:30:54.406459-07:00 CRITICAL /opt/couchbase/bin/../lib/libplatform_so.so.0.1.0() [0x7f2e4ddac000+0x8f17] 2020-07-14T23:30:54.406467-07:00 CRITICAL /lib64/libpthread.so.0() [0x7f2e4b5c8000+0x7dd5] 2020-07-14T23:30:54.406499-07:00 CRITICAL /lib64/libc.so.6(clone+0x6d) [0x7f2e4b1fb000+0xfdead] Rebalance exited with reason {mover_crashed, {unexpected_exit, {'EXIT',<0.6670.0>, {{{{{child_interrupted, {'EXIT',<17502.2478.0>,socket_closed}}, [{dcp_replicator,spawn_and_wait,1, [{file,"src/dcp_replicator.erl"}, {line,266}]}, {dcp_replicator,handle_call,3, [{file,"src/dcp_replicator.erl"}, {line,121}]}, {gen_server,try_handle_call,4, [{file,"gen_server.erl"},{line,636}]}, {gen_server,handle_msg,6, [{file,"gen_server.erl"},{line,665}]}, {proc_lib,init_p_do_apply,3, [{file,"proc_lib.erl"},{line,247}]}]}, {gen_server,call, [<17502.2476.0>,get_partitions,infinity]}}, {gen_server,call, ['dcp_replication_manager-default', {get_replicator_pid,543}, infinity]}}, {gen_server,call, [{'janitor_agent-default', 'ns_1@172.23.123.102'}, {if_rebalance,<0.3620.0>, {update_vbucket_state,979,active,paused, undefined, [['ns_1@172.23.123.102', 'ns_1@172.23.123.101', 'ns_1@172.23.107.52']]}}, infinity]}}}}}. Rebalance Operation Id = 322d92a2335598e144eb0bb97f14f1a3 Worker <0.6325.0> (for action {move,{979, ['ns_1@172.23.123.102', 'ns_1@172.23.123.101', 'ns_1@172.23.107.52'], ['ns_1@172.23.107.52', 'ns_1@172.23.123.100', 'ns_1@172.23.123.102'], []}}) exited with reason {unexpected_exit, {'EXIT', <0.6670.0>, {{{{{child_interrupted, {'EXIT', <17502.2478.0>, socket_closed}}, [{dcp_replicator, spawn_and_wait, 1, [{file, "src/dcp_replicator.erl"}, {line, 266}]}, {dcp_replicator, handle_call, 3, [{file, "src/dcp_replicator.erl"}, {line, 121}]}, {gen_server, try_handle_call, 4, [{file, "gen_server.erl"}, {line, 636}]}, {gen_server, handle_msg, 6, [{file, "gen_server.erl"}, {line, 665}]}, {proc_lib, init_p_do_apply, 3, [{file, "proc_lib.erl"}, {line, 247}]}]}, {gen_server, call, [<17502.2476.0>, get_partitions, infinity]}}, {gen_server, call, ['dcp_replication_manager-default', {get_replicator_pid, 543}, infinity]}}, {gen_server, call, [{'janitor_agent-default', 'ns_1@172.23.123.102'}, {if_rebalance, <0.3620.0>, {update_vbucket_state, 979, active, paused, undefined, [['ns_1@172.23.123.102', 'ns_1@172.23.123.101', 'ns_1@172.23.107.52']]}}, infinity]}}}}{noformat} |
*Build*: 6.6.0-7880-enterprise
*Scenario*: * 4 node cluster, Couchbase bucket (replica=2) * Rebalance out 1 node from the cluster * Initiate transaction in parallel to rebalance_out operation {noformat}+----------------+-----------------+--------------+ | Nodes | Services | Status | +----------------+-----------------+--------------+ | 172.23.107.52 | index, kv, n1ql | Cluster node | | 172.23.123.101 | kv | --- OUT ---> | | 172.23.123.102 | kv | Cluster node | | 172.23.123.100 | kv | Cluster node | +----------------+-----------------+--------------+{noformat} *Observation:* Seeing rebalance failure followed by memcached crash on master node - 172.23.107.52 {noformat}Service 'memcached' exited with status 134. Restarting. Messages: 2020-07-14T23:30:54.406403-07:00 CRITICAL /opt/couchbase/bin/../lib/libstdc++.so.6() [0x7f2e4bcfd000+0x8f213] 2020-07-14T23:30:54.406414-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xccc10] 2020-07-14T23:30:54.406426-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xc805a] 2020-07-14T23:30:54.406434-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xca463] 2020-07-14T23:30:54.406441-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0x18f5a0] 2020-07-14T23:30:54.406447-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0xcf98d] 2020-07-14T23:30:54.406454-07:00 CRITICAL /opt/couchbase/bin/../lib/../lib/ep.so() [0x7f2e466a5000+0x12b864] 2020-07-14T23:30:54.406459-07:00 CRITICAL /opt/couchbase/bin/../lib/libplatform_so.so.0.1.0() [0x7f2e4ddac000+0x8f17] 2020-07-14T23:30:54.406467-07:00 CRITICAL /lib64/libpthread.so.0() [0x7f2e4b5c8000+0x7dd5] 2020-07-14T23:30:54.406499-07:00 CRITICAL /lib64/libc.so.6(clone+0x6d) [0x7f2e4b1fb000+0xfdead] Rebalance exited with reason {mover_crashed, {unexpected_exit, {'EXIT',<0.6670.0>, {{{{{child_interrupted, {'EXIT',<17502.2478.0>,socket_closed}}, [{dcp_replicator,spawn_and_wait,1, [{file,"src/dcp_replicator.erl"}, {line,266}]}, {dcp_replicator,handle_call,3, [{file,"src/dcp_replicator.erl"}, {line,121}]}, {gen_server,try_handle_call,4, [{file,"gen_server.erl"},{line,636}]}, {gen_server,handle_msg,6, [{file,"gen_server.erl"},{line,665}]}, {proc_lib,init_p_do_apply,3, [{file,"proc_lib.erl"},{line,247}]}]}, {gen_server,call, [<17502.2476.0>,get_partitions,infinity]}}, {gen_server,call, ['dcp_replication_manager-default', {get_replicator_pid,543}, infinity]}}, {gen_server,call, [{'janitor_agent-default', 'ns_1@172.23.123.102'}, {if_rebalance,<0.3620.0>, {update_vbucket_state,979,active,paused, undefined, [['ns_1@172.23.123.102', 'ns_1@172.23.123.101', 'ns_1@172.23.107.52']]}}, infinity]}}}}}. Rebalance Operation Id = 322d92a2335598e144eb0bb97f14f1a3 Worker <0.6325.0> (for action {move,{979, ['ns_1@172.23.123.102', 'ns_1@172.23.123.101', 'ns_1@172.23.107.52'], ['ns_1@172.23.107.52', 'ns_1@172.23.123.100', 'ns_1@172.23.123.102'], []}}) exited with reason {unexpected_exit, {'EXIT', <0.6670.0>, {{{{{child_interrupted, {'EXIT', <17502.2478.0>, socket_closed}}, [{dcp_replicator, spawn_and_wait, 1, [{file, "src/dcp_replicator.erl"}, {line, 266}]}, {dcp_replicator, handle_call, 3, [{file, "src/dcp_replicator.erl"}, {line, 121}]}, {gen_server, try_handle_call, 4, [{file, "gen_server.erl"}, {line, 636}]}, {gen_server, handle_msg, 6, [{file, "gen_server.erl"}, {line, 665}]}, {proc_lib, init_p_do_apply, 3, [{file, "proc_lib.erl"}, {line, 247}]}]}, {gen_server, call, [<17502.2476.0>, get_partitions, infinity]}}, {gen_server, call, ['dcp_replication_manager-default', {get_replicator_pid, 543}, infinity]}}, {gen_server, call, [{'janitor_agent-default', 'ns_1@172.23.123.102'}, {if_rebalance, <0.3620.0>, {update_vbucket_state, 979, active, paused, undefined, [['ns_1@172.23.123.102', 'ns_1@172.23.123.101', 'ns_1@172.23.107.52']]}}, infinity]}}}}{noformat} *Test to run:* {noformat} Atomicity.doc_isolation.IsolationDocTest.test_transaction_with_rebalance,nodes_init=4,replicas=2,num_items=20000,rebalance_type=out,nodes_out=1,doc_op=create,durability=PERSIST_TO_MAJORITY,services_init=kv;n1ql;index,rerun=False {noformat} |
| Summary | [Doc isolation] Seeing rebalance failure with reason "mover crashed" followed by memcached crash | [Doc isolation] failed as no HashTable item found with key:<ud>cid:0x0:test_docs-00020907</ud> prepare_seqno:29, commit_seqno: 30 |
| Summary | [Doc isolation] failed as no HashTable item found with key:<ud>cid:0x0:test_docs-00020907</ud> prepare_seqno:29, commit_seqno: 30 | [Doc isolation] failed as no HashTable item found with key:.... prepare_seqno:29, commit_seqno: 30 |
Tried repro without TAF today with no luck. Been trying TAF repro and hitting the following error:
2020-07-17 18:13:41,720 | test | ERROR | pool-2-thread-4 | [rest_client:_http_request:746] POST http://127.0.0.1:9003/pools/default body: memoryQuota=13007 headers: {'Accept': '*/*', 'Connection': 'close', 'Authorization': 'Basic QWRtaW5pc3RyYXRvcjphc2Rhc2Q=\n', 'Content-Type': 'application/x-www-form-urlencoded'} error: 400 reason: unknown {"errors":{"_":"Total quota (13007MB) exceeds the maximum allowed quota (9157MB) on node 'n_3@127.0.0.1'"}} auth: Administrator:asdasd
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Ashwin Govindarajulu, how do you specify memory quota for the test?
As discussed with Ben Huddleston, he was using CE of server. So bucket creation was failing with following log message in TAF,
2020-07-17 18:23:56,805 | test | INFO | MainProcess | pool-2-thread-5 | [table_view:display:72] Rebalance Overview
--------------------------------------
| Nodes | Services | Status |
--------------------------------------
| 127.0.0.1 | index, kv, n1ql | Cluster node |
| 127.0.0.1 | None | <--- IN — |
| 127.0.0.1 | None | <--- IN — |
| 127.0.0.1 | None | <--- IN — |
-------------------------+-------------+2020-07-17 18:23:56,855 | test | INFO | MainProcess | pool-2-thread-5 | [task:check:320] Rebalance - status: running, progress: 0
2020-07-17 18:24:06,959 | test | INFO | MainProcess | pool-2-thread-5 | [task:check:320] Rebalance - status: none, progress: 100
2020-07-17 18:24:06,982 | test | INFO | MainProcess | pool-2-thread-5 | [task:check:377] Rebalance completed with progress: 100% in 10.1910002232 sec
2020-07-17 18:24:07,403 | infra | ERROR | MainProcess | pool-2-thread-6 | [Rest_Connection:_http_request:205] POST http://127.0.0.1:9000/pools/default/buckets body: storageBackend=couchstore&replicaIndex=1&maxTTL=0&flushEnabled=0&durabilityMinLevel=none&compressionMode=passive&bucketType=couchbase&conflictResolutionType=seqno&name=default&replicaNumber=2&ramQuotaMB=100&threadsNumber=3&evictionPolicy=valueOnly headers: {'Accept': '/', 'Connection': 'close', 'Authorization': 'Basic QWRtaW5pc3RyYXRvcjphc2Rhc2Q=', 'Content-Type': 'application/x-www-form-urlencoded'} error: 400 reason: unknown {"errors":{"maxTTL":"Max TTL is supported in enterprise edition only","compressionMode":"Compression mode is supported in enterprise edition only"},"summaries":{"ramSummary":{"total":22187868160,"otherBuckets":0,"nodesCount":4,"perNodeMegs":100,"thisAlloc":419430400,"thisUsed":0,"free":21768437760},"hddSummary":{"total":1999852683264,"otherData":1719873307604,"otherBuckets":0,"thisUsed":0,"free":279979375660}}} auth: Administrator:asdas
So asked him to switch to EE and try again.
| Due Date | 20/Jul/20 | 24/Jul/20 |
Tried repro with TAF cluster_run and hit other issues. Ashwin Govindarajulu said that this test won't work properly with a cluster_run so switched to vagrants.
Hit a gsl assert in the ADM when running this test with vagrants. Expect it could have the same root cause so it's worth mentioning here. Here's the backtrace.
(gdb) bt full
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#0 0x00007f04936025c9 in raise () from /usr/lib64/libc-2.17.so
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No symbol table info available.
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#1 0x00007f0493603cd8 in abort () from /usr/lib64/libc-2.17.so
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No symbol table info available.
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#2 0x00007f0494154195 in __gnu_cxx::__verbose_terminate_handler () at /tmp/deploy/gcc-7.3.0/libstdc++-v3/libsupc++/vterminate.cc:95
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terminating = false
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t = <optimized out>
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#3 0x0000000000549e42 in backtrace_terminate_handler () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/utilities/terminate_handler.cc:86
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No locals.
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#4 0x00007f0494151f86 in __cxxabiv1::__terminate (handler=<optimized out>) at /tmp/deploy/gcc-7.3.0/libstdc++-v3/libsupc++/eh_terminate.cc:47
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No locals.
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#5 0x00007f0494151fd1 in std::terminate () at /tmp/deploy/gcc-7.3.0/libstdc++-v3/libsupc++/eh_terminate.cc:57
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No locals.
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#6 0x00007f0494152213 in __cxxabiv1::__cxa_throw (obj=obj@entry=0x7f047c0060c0, tinfo=0x7f9ab0 <typeinfo for std::logic_error>, dest=0x418c50 <_ZNSt11logic_errorD1Ev@plt>) at /tmp/deploy/gcc-7.3.0/libstdc++-v3/libsupc++/eh_throw.cc:93
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globals = <optimized out>
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header = 0x7f047c006040
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#7 0x00007f048eb71c10 in ActiveDurabilityMonitor::throwException<std::logic_error> (this=this@entry=0x7f046100b0f0, thrower=..., error=...) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/durability/active_durability_monitor.cc:1482
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No locals.
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#8 0x00007f048eb6d05a in ActiveDurabilityMonitor::abort (this=this@entry=0x7f046100b0f0, sw=...) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/durability/active_durability_monitor.cc:872
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key = <optimized out>
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result = ENGINE_KEY_ENOENT
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__func__ = "abort"
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s = <optimized out>
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#9 0x00007f048eb6f463 in ActiveDurabilityMonitor::processCompletedSyncWriteQueue (this=0x7f046100b0f0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/durability/active_durability_monitor.cc:450
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sw = {storage_ = {{emptyState = -96 '\240', value = {<DurabilityMonitor::SyncWrite> = {item = {value = 0x7f046873e2a0}, startTime = {__d = {__r = 813149465068}}, status = ToAbort}, cookie = 0x7f04606fd680, firstChain = {
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ackCount = {<IgnorePolicy<unsigned char>> = {<No data fields>}, val = 1 '\001'}, chainPtr = 0x7f0460f1a590}, secondChain = {ackCount = {<IgnorePolicy<unsigned char>> = {<No data fields>}, val = 0 '\000'}, chainPtr = 0x0},
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expiryTime = {<boost::optional_detail::optional_base<std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1, 1000000000> > > >> = {<boost::optional_detail::optional_tag> = {<No data fields>}, m_initialized = true,
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m_storage = {dummy_ = {data = "\236p\230ٽ\000\000", aligner_ = {<No data fields>}}}}, <No data fields>}}}, hasValue = true}}
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lock = {_M_device = @0x7f04610111a8}
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#10 0x00007f048ec345a0 in VBucket::processResolvedSyncWrites (this=0x7f0461035800) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/vbucket.cc:697
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rlh = {lock_ = 0x7f0461035a50, token_ = {type_ = folly::SharedMutexToken::INLINE_SHARED, slot_ = 25215}}
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#11 0x00007f048eb7498d in DurabilityCompletionTask::run (this=0x7f048fd64510) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/durability/durability_completion_task.cc:53
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vb = {<std::__shared_ptr<VBucket, (__gnu_cxx::_Lock_policy)2>> = {<std::__shared_ptr_access<VBucket, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, _M_ptr = 0x7f0461035800, _M_refcount = {_M_pi = 0x7f0461044f20}}, <No data fields>}
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runtime = <optimized out>
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startTime = {__d = {__r = 815400727662}}
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pendingVb = {vbid = 33}
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#12 0x00007f048ebd0864 in ExecutorThread::run (this=0x7f048fd6ab20) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/executorthread.cc:190
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curTaskDescr = {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x7f04615cf8a0 <Address 0x7f04615cf8a0 out of bounds>}, _M_string_length = 24, {
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_M_local_buf = "\030\000\000\000\000\000\000\000pressor", _M_allocated_capacity = 24}}
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woketime = <optimized out>
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scheduleOverhead = <optimized out>
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again = <optimized out>
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runtime = <optimized out>
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q = <optimized out>
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tick = 249 '\371'
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#13 0x00007f049617af17 in run (this=0x7f0492fc3110) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:58
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No locals.
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#14 platform_thread_wrap (arg=0x7f0492fc3110) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:71
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context = {_M_t = {
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_M_t = {<std::_Tuple_impl<0, CouchbaseThread*, std::default_delete<CouchbaseThread> >> = {<std::_Tuple_impl<1, std::default_delete<CouchbaseThread> >> = {<std::_Head_base<1, std::default_delete<CouchbaseThread>, true>> = {<std::default_delete<CouchbaseThread>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0, CouchbaseThread*, false>> = {_M_head_impl = 0x7f0492fc3110}, <No data fields>}, <No data fields>}}}
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#15 0x00007f0493995df3 in start_thread () from /usr/lib64/libpthread-2.17.so
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No symbol table info available.
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#16 0x00007f04936c31ad in clone () from /usr/lib64/libc-2.17.so
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No symbol table info available.
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Will investigate the logs.
Didn't manage to get the logs for the above crash, they'd rotated out already.
Managed to repro the issue on vagrants (I believe twice). My attempt at getting pcaps was unsuccessful though so running again. TAF can do this with the option "collect_pcaps=True" though which is handy. Believe I've got a repro again, but it's stuck in a txn cleanup phase (this is 1 snippet of logs).
15:38:07.564 244/pool-2-thread-15/841a5 ErrorWrapper retryTransaction=false
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15:38:07.564 244/pool-2-thread-15/841a5/e8cb6 converted ErrorWrapper TRANSACTION_EXPIRED to final error com.couchbase.transactions.error.TransactionExpired: Transaction has expired configured timeout of 100000msecs. The transaction is not committed.
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TransactionCleanupEndRunEvent: start={default/_default/clientId=1583f,index=0,numClients=2,ATRs={checking=512,total=1024},runLength=60000millis},end={taken=10128millis,ATRs={tried=0,present=0,errored=0},entries={expired=0,failed=0,total=0},largestNumEntries=0}
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TransactionCleanupEndRunEvent: start={default/_default/clientId=6b822,index=1,numClients=2,ATRs={checking=512,total=1024},runLength=60000millis},end={taken=10127millis,ATRs={tried=0,present=0,errored=0},entries={expired=0,failed=0,total=0},largestNumEntries=0}
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I think that this phase is running some kind of txn which is constantly failing because the previous errors have got at least one node stuck as the DCP connections are constantly being torn down with errors. It hasn't spit out the pcaps or cbcollects yet though.
| Labels | 6.6.0 Transactions functional-test | 6.6.0 Transactions approved-for-6.6.0 functional-test |
| Link | This issue blocks MB-38724 [ MB-38724 ] |
Ashwin Govindarajulu told me that the easiest way to get pcaps in this case is to just ssh to each vagrant node and kill the tcpdump process. In attempting to do so I found that the tcpdump process was not actually running. tcpdump wasn't running because the tcpdump command in pytests/basetestcase.py assumes we are using the eth0 device which is not the case for my VMs.
tcpdump -C 500 -w pcaps/pack-dump-file.pcap -i eth0 -s 0 tcp
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After changing this to use an appropriate device and a bit of messing about to rebuild my local wireshark I managed to get pcaps of a reproduction.
| Attachment | Screenshot 2020-07-21 at 09.12.47.png [ 101663 ] |
Log snippets for node .104 which hit this.
2020-07-20T18:41:32.612223+00:00 INFO (default) VBucket: created vb:55 with state:replica initialState:dead lastSeqno:0 persistedRange:{0,0} max_cas:0 uuid:179188313359479 topology:null
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2020-07-20T18:41:32.612244+00:00 INFO (default) VBucket::setState: transitioning vb:55 with high seqno:0 from:replica to:replica
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2020-07-20T18:41:32.834898+00:00 INFO 51: (default) DCP (Consumer) eq_dcpq:replication:ns_1@10.112.202.101->ns_1@10.112.202.104:default - (vb:55) Attempting to add stream: opaque_:15, start_seqno_:0, end_seqno_:18446744073709551615, vb_uuid:179188313359479, snap_start_seqno_:0, snap_end_seqno_:0, last_seqno:0, stream_req_value:{"uid":"0"}
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2020-07-20T18:41:33.117764+00:00 INFO 53: (default) DCP (Consumer) eq_dcpq:replication:ns_1@10.112.202.103->ns_1@10.112.202.104:default - (vb:555) Attempting to add stream: opaque_:1, start_seqno_:0, end_seqno_:18446744073709551615, vb_uuid:128582366262475, snap_start_seqno_:0, snap_end_seqno_:0, last_seqno:0, stream_req_value:{"uid":"0"}
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2020-07-20T18:41:33.117785+00:00 INFO 53: (default) DCP (Consumer) eq_dcpq:replication:ns_1@10.112.202.103->ns_1@10.112.202.104:default - (vb:556) Attempting to add stream: opaque_:2, start_seqno_:0, end_seqno_:18446744073709551615, vb_uuid:158066772463846, snap_start_seqno_:0, snap_end_seqno_:0, last_seqno:0, stream_req_value:{"uid":"0"}
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2020-07-20T18:41:33.117802+00:00 INFO 53: (default) DCP (Consumer) eq_dcpq:replication:ns_1@10.112.202.103->ns_1@10.112.202.104:default - (vb:557) Attempting to add stream: opaque_:3, start_seqno_:0, end_seqno_:18446744073709551615, vb_uuid:194833567066844, snap_start_seqno_:0, snap_end_seqno_:0, last_seqno:0, stream_req_value:{"uid":"0"}
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2020-07-20T18:41:33.117811+00:00 INFO 53: (default) DCP (Consumer) eq_dcpq:replication:ns_1@10.112.202.103->ns_1@10.112.202.104:default - (vb:558) Attempting to add stream: opaque_:4, start_seqno_:0, end_seqno_:18446744073709551615, vb_uuid:160753835799648, snap_start_seqno_:0, snap_end_seqno_:0, last_seqno:0, stream_req_value:{"uid":"0"}
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2020-07-20T18:41:33.117818+00:00 INFO 53: (default) DCP (Consumer) eq_dcpq:replication:ns_1@10.112.202.103->ns_1@10.112.202.104:default - (vb:559) Attempting to add stream: opaque_:5, start_seqno_:0, end_seqno_:18446744073709551615, vb_uuid:28356807138515, snap_start_seqno_:0, snap_end_seqno_:0, last_seqno:0, stream_req_value:{"uid":"0"}
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2020-07-20T18:43:11.619383+00:00 ERROR (default) VBucket::commit (vb:55) failed as no HashTable item found with key:<ud>cid:0x0:test_docs-20049</ud> prepare_seqno:13, commit_seqno: 14
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Pcap shows this is a deleted prepare which was preceded by an abort for the same key.
With the recent txn changes to stage documents as deleted every prepare should be marked deleted.
| Attachment | Screenshot 2020-07-21 at 09.58.48.png [ 101666 ] |
Based on seqno acks in the pcap we know that this node has persisted the prepare that "went missing" (the highlighted prepare).
Think I've found the bug here. There's a race condition when we flush documents that requires an abort and a deleted prepare that is as follows:
- Create and flush a prepare
- Create an abort for that prepare
- Run the flusher to the point that it has acquired the mutations from the CheckpointManager but not yet invoked the PersistenceCallback
- Create a deleted prepare with the same key
- Finish running the PersistenceCallback
At step 5 we call "VBucket::deletedOnDiskCbk" for the abort. We call this function as an abort has the deleted flag set on the item and it is not a prepare. This function then attempts to find the item in the HashTbale and if the item exists, is deleted, and has the same rev seqno, then we delete it from the HashTable. This is the cause of the "prepare not found" errors. This can manifest on the replica as an "ERROR" message which causes the DCP stream to shut down, or, on the active, as a crash in the ActiveDurabilityMonitor.
This is most likely a latent bug with SyncDeletes that has come up now as changing transactions to store staged mutations as deleted has increased the likelihood of hitting it.
This is most likely a latent bug with SyncDeletes that has come up now as changing transactions to store staged mutations as deleted has increased the likelihood of hitting it.
Can you confirm, and if so update the affectsVersion to include 6.5.0 and 6.5.1 please?
| Affects Version/s | 6.5.1 [ 16622 ] | |
| Affects Version/s | 6.5.0 [ 15037 ] |
| Summary | [Doc isolation] failed as no HashTable item found with key:.... prepare_seqno:29, commit_seqno: 30 | Non-complete, unpersisted, "deleted" prepare can be removed from HashTable by the persistence of previous abort |
| Assignee | Ben Huddleston [ ben.huddleston ] | Ashwin Govindarajulu [ ashwin.govindarajulu ] |
| Resolution | Fixed [ 1 ] | |
| Status | Open [ 1 ] | Resolved [ 5 ] |
Build couchbase-server-6.6.0-7888 contains kv_engine commit 6842000 with commit message:
MB-40480: Compare seqno at VBucket::deletedOnDiskCbk
Not seeing this issue in latest build. Verified using 6.6.0-7891.
Hence closing this ticket.
| VERIFICATION STEPS |
Ran the same test few time and not hitting this issue.
Job: http://qa.sc.couchbase.com/job/oel6-4node-rebalance_in_jython/1128/console |
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| Status | Resolved [ 5 ] | Closed [ 6 ] |
Build couchbase-server-7.0.0-2712 contains kv_engine commit 6842000 with commit message:
MB-40480: Compare seqno at VBucket::deletedOnDiskCbk
On 172.23.107.52 seeing:
2020-07-14T23:30:47.535365-07:00 ERROR 92: (default) DCP (Producer) eq_dcpq:replication:ns_1@172.23.107.52->ns_1@172.23.123.101:default - DcpProducer::handleResponse disconnecting, received unexpected response:{"bodylen":0,"cas":0,"datatype":"raw","extlen":0,"keylen":0,"magic":"ClientResponse","opaque":124,"opcode":"DCP_COMMIT","status":"Not found"}2020-07-14T23:30:49.918099-07:00 ERROR 62: (default) DCP (Producer) eq_dcpq:replication:ns_1@172.23.107.52->ns_1@172.23.123.101:default - DcpProducer::handleResponse disconnecting, received unexpected response:{"bodylen":0,"cas":0,"datatype":"raw","extlen":0,"keylen":0,"magic":"ClientResponse","opaque":124,"opcode":"DCP_COMMIT","status":"Not found"}2020-07-14T23:30:54.336833-07:00 ERROR (default) VBucket::abort (vb:243) - active failed as no HashTableitem found with key:<ud>cid:0x0:test_docs-00007567</ud>