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  1. Couchbase Server
  2. MB-32358

Collections: DCP stream-request for collection extra seqno checks required.

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      Note: This MB used to track a feature called anti-lag, away to stop DCP clients falling behind the purge-seqno - the comments write up an idea that means we can use the collection high-seqno to determine if a client behind the purge-seqno can still safely re-connect.

      https://issues.couchbase.com/browse/MB-32358?focusedCommentId=421402&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-421402

      The technique only need apply to DCP clients that choose a scope or collection and does not apply to 'replication'. When a scope or muliple collections are selected, the technique needs to consider all collections, only if all collections satisfy the condition can we proceed.

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          causes

          Bug - A problem which impairs or prevents the functions of the product. MB-62940 [Ephemeral] Collection backfill does not allow collection highSeqno <= purgeSeqno on reconnect

          • Major - Major loss of function.
          • In Progress
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MB-40288 Creating deferred indexes taking unusually long time

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          For Gerrit Dashboard: MB-32358
          # Subject Branch Project Status CR V
          133977,13 MB-32358: Reduce the need for rollback for collection streams master kv_engine Status: MERGED +2 +1
          213484,2 MB-62940: Collection stream purgeSeqno logic for Ephemeral neo kv_engine Status: ABANDONED 0 -1
          213528,3 MB-62940: Collection stream purgeSeqno logic for Ephemeral trinity kv_engine Status: MERGED +2 +1

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              richard.demellow Richard deMellow
              jwalker Jim Walker
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                Resolved:

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