[MB-51513] Upgrades can fail due to the 200 character limit for DCP connections - Couchbase database

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Details

Type: Bug
Status: Closed
Priority: Critical
Resolution: Fixed
Affects Version/s: 7.0.0, 7.0.3, 7.0.2, 7.0.1, 6.6.5
Fix Version/s: 7.1.0, 7.0.4
Component/s: couchbase-bucket
Labels:
- approved-for-7.0.4
- approved-for-neo

Triage:
Triaged
Story Points:
1
Is this a Regression?:
Yes
Sprint:
KV March-22

Description

With the restriction of 200 char limit it is possible that upgrading a pre 6.6.5 cluster will fail where previously it would have passed.

The reason is that with a key length > 250 in a mcbp response can result in a disconnect and hence a rebalance failure. However it is possible to have a dcp connection name length > 200 without triggering the key length > 250 response issue.

See customer CBSE linked as an example case.

The fix is to remove the restriction by reverting the associated patch https://review.couchbase.org/c/kv_engine/+/114481

Attachments

Issue Links

relates to

MB-51458 Clusters with long hostnames may not be online upgradeable to 7.x or 6.6.5

Closed

MB-34280 Memcached should disallow DCP connections with names greater than 200 characters (was: ns_server connections may be terminated if a client uses a long DCP_OPEN.name)

Closed

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View 4 older comments

Couchbase Build Team added a comment - 18/Mar/22 12:05 PM

Build couchbase-server-7.1.0-2505 contains kv_engine commit cc160cb with commit message:
~~MB-51513~~: Revert "~~MB-34280~~: Set max DCP name to 200 characters"

Couchbase Build Team added a comment - 18/Mar/22 12:05 PM Build couchbase-server-7.1.0-2505 contains kv_engine commit cc160cb with commit message: MB-51513 : Revert " MB-34280 : Set max DCP name to 200 characters"

Couchbase Build Team added a comment - 22/Mar/22 6:27 PM

Build couchbase-server-7.2.0-1024 contains kv_engine commit ac0da7c with commit message:
~~MB-51513~~: Merge branch 'couchbase/cheshire-cat' into 'couchbase/neo'

Couchbase Build Team added a comment - 22/Mar/22 6:27 PM Build couchbase-server-7.2.0-1024 contains kv_engine commit ac0da7c with commit message: MB-51513 : Merge branch 'couchbase/cheshire-cat' into 'couchbase/neo'

Couchbase Build Team added a comment - 22/Mar/22 6:27 PM

Build couchbase-server-7.2.0-1024 contains kv_engine commit cc160cb with commit message:
~~MB-51513~~: Revert "~~MB-34280~~: Set max DCP name to 200 characters"

Couchbase Build Team added a comment - 22/Mar/22 6:27 PM Build couchbase-server-7.2.0-1024 contains kv_engine commit cc160cb with commit message: MB-51513 : Revert " MB-34280 : Set max DCP name to 200 characters"

Couchbase Build Team added a comment - 22/Mar/22 6:27 PM

Build couchbase-server-7.2.0-1024 contains kv_engine commit 5cbcd28 with commit message:
~~MB-51513~~: Merge 'couchbase/cheshire-cat' into 'couchbase/neo'

Couchbase Build Team added a comment - 22/Mar/22 6:27 PM Build couchbase-server-7.2.0-1024 contains kv_engine commit 5cbcd28 with commit message: MB-51513 : Merge 'couchbase/cheshire-cat' into 'couchbase/neo'

Anitha Kuberan added a comment - 23/Mar/22 10:56 PM

online upgrade successfully passed

6.6.0 to 7.1.0-2517
6.6.5 to 7.1.0-2517
7.0.4 to 7.1.0-2517

Tested with bucket name length 100

Anitha Kuberan added a comment - 23/Mar/22 10:56 PM online upgrade successfully passed 6.6.0 to 7.1.0-2517 6.6.5 to 7.1.0-2517 7.0.4 to 7.1.0-2517 Tested with bucket name length 100