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  1. Couchbase Server
  2. MB-59310

Handle empty snapshot from checkpoints

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    • KV 2023-4

    Description

      We have recently hit processing empty snapshots from checkpoints in cases where the DCP client streams from replica vbuckets.
      That happened in cases where streaming from replicas was unexpected (FTS in MB-57443, CBAS in MB-59282), but we do support streaming from replicas for the ViewEngine, so concern is that we might hit the same on production envs.

      We need at least to make memcached resilient to that scenario and prevent a crash (see https://review.couchbase.org/c/kv_engine/+/193433).

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          is triggered by

          Bug - A problem which impairs or prevents the functions of the product. MB-57443 [System Test] : CRITICAL Caught unhandled std::exception-derived exception. what(): GSL: Precondition failure: 'itemsForCursor.ranges.size() == 1' at /home/couchbase/jenkins/workspace/toy-unix-simple/kv_engine/engines/ep/src/dcp/active_stream.cc:1012

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

          Bug - A problem which impairs or prevents the functions of the product. MB-59282 [System Test] :- CRITICAL Caught unhandled std::exception-derived exception. what(): ActiveStream::getOutstandingItems: stream:eq_dcpq:cbas:Local:bucket4:1c796c38c739683bc6dee69c0e89a438:2sid:5 vb:122

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
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              paolo.cocchi Paolo Cocchi
              paolo.cocchi Paolo Cocchi
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