Details
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Bug
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Resolution: Fixed
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Major
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5.5.0
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Untriaged
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Unknown
Description
Build : 5.5.0-2958 (RC4)
While the system was running, a query was run separately on the same cluster (query is not a part of the test). This query resulted in a panic on the query log. Upon retrying the query, it returned results and didnt result in an error. Re-ran twice again, it panic'd once more. So 2/4 times it panicked.
Query
select meta().xattrs._sync.sequence
from default
where meta().xattrs._sync.sequence is not null
limit 10
Indexes on xattr
CREATE INDEX `sg_roleAccess_x1` ON `default`((all (array (`op`.`name`) for `op` in object_pairs((((meta().`xattrs`).`_sync`).`role_access`)) end))) WITH { "defer_build":true, "retain_deleted_xattr":true, "num_replica":1 }
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CREATE INDEX `sg_access_x1` ON `default`((all (array (`op`.`name`) for `op` in object_pairs((((meta().`xattrs`).`_sync`).`access`)) end))) WITH { "defer_build":true, "retain_deleted_xattr":true, "num_replica":1 }
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CREATE INDEX `sg_allDocs_x1` ON `default`((((meta().`xattrs`).`_sync`).`sequence`),(((meta().`xattrs`).`_sync`).`rev`),(((meta().`xattrs`).`_sync`).`flags`),(((meta().`xattrs`).`_sync`).`deleted`)) WHERE (not ((meta().`id`) like "\\_sync:%")) WITH { "defer_build":true, "retain_deleted_xattr":true, "num_replica":1 }
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CREATE INDEX `sg_channels_x1` ON `default`((all (array [(`op`.`name`), least((((meta().`xattrs`).`_sync`).`sequence`), ((`op`.`val`).`seq`)), ifmissing(((`op`.`val`).`rev`), null), ifmissing(((`op`.`val`).`del`), null)] for `op` in object_pairs((((meta().`xattrs`).`_sync`).`channels`)) end)),(((meta().`xattrs`).`_sync`).`rev`),(((meta().`xattrs`).`_sync`).`sequence`),(((meta().`xattrs`).`_sync`).`flags`)) WITH { "defer_build":true, "retain_deleted_xattr":true, "num_replica":1 }
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CREATE INDEX `sg_tombstones_x1` ON `default`((((meta().`xattrs`).`_sync`).`tombstoned_at`)) WITH { "defer_build":true, "retain_deleted_xattr":true, "num_replica":1 }
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Panic seen in query log on 172.23.104.61
_time=2018-07-13T01:58:19.535-07:00 _level=SEVERE _msg=panic: runtime error: index out of range
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request text:
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<ud>select meta().xattrs._sync.sequence
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from default
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where meta().xattrs._sync.sequence is not null
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limit 10</ud>
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stack:
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goroutine 3792435 [running]:
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github.com/couchbase/query/execution.(*Context).Recover(0xc4219a5600)
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goproj/src/github.com/couchbase/query/execution/context.go:498 +0xbc
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panic(0xe37480, 0x186d160)
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/home/couchbase/.cbdepscache/exploded/x86_64/go-1.8.5/go/src/runtime/panic.go:489 +0x2cf
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github.com/couchbase/query/datastore/couchbase.getSubDocFetchResults(0xc425bcef20, 0x12, 0xc42f4fd020, 0xc424b53d20, 0x2, 0x2, 0x1, 0x18d1280, 0xc42e482ae0)
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goproj/src/github.com/couchbase/query/datastore/couchbase/couchbase.go:1096 +0xb81
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github.com/couchbase/query/datastore/couchbase.(*keyspace).Fetch(0xc4201a3090, 0xc42d309000, 0x10, 0x40, 0xc42df36ea0, 0x189a4a0, 0xc4219a5600, 0xc421ec1540, 0x1, 0x1, ...)
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goproj/src/github.com/couchbase/query/datastore/couchbase/couchbase.go:1044 +0x379
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github.com/couchbase/query/execution.(*Fetch).flushBatch(0xc42bb381e0, 0xc4219a5600, 0x1906600)
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goproj/src/github.com/couchbase/query/execution/fetch.go:108 +0x533
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github.com/couchbase/query/execution.(*base).enbatchSize(0xc42bb381e0, 0x18d1280, 0xc431086330, 0x189a500, 0xc42bb381e0, 0x10, 0xc4219a5600, 0xc431086330)
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goproj/src/github.com/couchbase/query/execution/base.go:707 +0x1a2
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github.com/couchbase/query/execution.(*Fetch).processItem(0xc42bb381e0, 0x18d1280, 0xc431086330, 0xc4219a5600, 0x1)
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goproj/src/github.com/couchbase/query/execution/fetch.go:53 +0x6a
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github.com/couchbase/query/execution.(*base).runConsumer.func1()
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goproj/src/github.com/couchbase/query/execution/base.go:547 +0x25d
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github.com/couchbase/query/util.(*Once).Do(0xc42bb382d8, 0xc4242f0738)
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goproj/src/github.com/couchbase/query/util/sync.go:51 +0x68
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github.com/couchbase/query/execution.(*base).runConsumer(0xc42bb381e0, 0x1897c40, 0xc42bb381e0, 0xc4219a5600, 0x0, 0x0)
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goproj/src/github.com/couchbase/query/execution/base.go:552 +0xaf
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github.com/couchbase/query/execution.(*Fetch).RunOnce(0xc42bb381e0, 0xc4219a5600, 0x0, 0x0)
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goproj/src/github.com/couchbase/query/execution/fetch.go:49 +0x5c
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created by github.com/couchbase/query/execution.(*base).runConsumer.func1
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goproj/src/github.com/couchbase/query/execution/base.go:537 +0x2f6
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Explain plan from one of the successful queries
{
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"plan": {
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"#operator": "Sequence",
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"~children": [
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{
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"#operator": "Sequence",
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"~children": [
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{
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"#operator": "PrimaryScan3",
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"index": "#primary",
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"index_projection": {
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"primary_key": true
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},
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"keyspace": "default",
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"namespace": "default",
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"using": "gsi"
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},
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{
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"#operator": "Fetch",
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"keyspace": "default",
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"namespace": "default",
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"subpaths": [
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"_sync"
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]
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},
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{
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"#operator": "Parallel",
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"~child": {
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"#operator": "Sequence",
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"~children": [
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{
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"#operator": "Filter",
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"condition": "((((meta(`default`).`xattrs`).`_sync`).`sequence`) is not null)"
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},
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{
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"#operator": "InitialProject",
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"result_terms": [
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{
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"expr": "(((meta(`default`).`xattrs`).`_sync`).`sequence`)"
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}
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]
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},
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{
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"#operator": "FinalProject"
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}
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]
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}
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}
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]
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},
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{
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"#operator": "Limit",
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"expr": "10"
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}
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]
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},
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"text": "select meta().xattrs._sync.sequence\nfrom default \nwhere meta().xattrs._sync.sequence is not null\nlimit 10"
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}
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