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[BP 7.1.4] Index build can hang in mixed mode due to projector skipping transaction records

Description

There is a bug during upgrade from 6.6.x to 7.x when transactional ATR/client record documents are present.

1. There was an optimization done in 7.0() to skip ATR/client records in projector and generate UpdateSeqno message in such a case.

projector/worker.go

2. In a mixed mode cluster, projector on 7.0.4 will skip any document with prefix "_txn:"(i.e. ATR/client records or any user created document with prefix "_txn:")

3. The problem is that a 6.6.5 indexer node cannot understand and process an UpdateSeqno message. So these UpdateSeqno messages will get skipped on the indexer node. If these UpdateSeqno messages correspond to SnapEnd of a DCP snapshot marker, indexer will keep waiting indefinitely and lead to index build hang.

Components

Affects versions

Fix versions

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Environment

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Link to Log File, atop/blg, CBCollectInfo, Core dump

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Release Notes Description

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Activity

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Yash Dodderi February 14, 2023 at 10:23 AM

Verfied the fix on 7.1.4 3580

Steps to verify–> https://couchbasecloud.atlassian.net/browse/MB-54681

Closing the ticket

CB robot February 2, 2023 at 12:20 AM

Build couchbase-server-7.1.4-3579 contains indexing commit 825acd9 with commit message:
[BP 7.1.4] Fix transaction record skipping at projector

Fixed
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Details

Assignee

Reporter

Is this a Regression?

Unknown

Story Points

Priority

Instabug

Open Instabug

PagerDuty

Sentry

Zendesk Support

Created November 29, 2022 at 5:12 AM
Updated August 31, 2024 at 11:07 AM
Resolved February 2, 2023 at 3:44 AM
Instabug