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  1. Couchbase Server
  2. MB-41255

Value eviction bucket - Replication of deletes with XATTRS will fail if return EWOULD_BLOCK

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    Description

      Problem

      As described in CBSE-8828, for a replica DCP stream. If a previous item that uses XATTRs is to be deleted, however it is not resident - then we must perform a bgfetch - see MB-36087. When the bgfetch is complete we replay PassiveStream::messageReceived. However this time it fails because the last seqno now equals the sequence number of the deletion and so it is discarded.

      Suggested Possible Solution

      • only set the last seqno to the seqno of the message just received, once the message has been completed or
      • If an EWOULD_BLOCK occurs reserve the setting of the last seqno so the message can be received again.

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        Issue Links

          backports to

          Technical task - A technical task. MB-41387 [BP] MB-41255 to 6.0.4 - MP2

          • Critical - Crashes, loss of data, severe memory leak.
          • Resolved
          blocks

          Task - A task that needs to be done. MB-41310 6.0.4-MP2

          • Major - Major loss of function.
          • Resolved
          is caused by

          Bug - A problem which impairs or prevents the functions of the product. MB-36087 DeleteWithMeta against a value evicted xattr document crashes memcached

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MB-41471 Upgrading to MB-41255

          • Critical - Crashes, loss of data, severe memory leak.
          • Resolved
          mentioned in

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              ashwin.govindarajulu Ashwin Govindarajulu
              owend Daniel Owen
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              Dates

                Created:
                Updated:
                Resolved:

                PagerDuty