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  1. Couchbase Server
  2. MB-4542

timeout and connection failures under moderate load

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Details

    • Bug
    • Resolution: Cannot Reproduce
    • Blocker
    • 2.0-beta
    • 2.0-developer-preview-3
    • None
    • Security Level: Public
    • None
    • 2.0 DP3
      originally reported on Debian GNU/Linux 6.0
      reproduced with slight differences on Ubuntu 11.10 64 bit

    Description

      Running initially with a PHP client, but then simplifying the test and running both clustered and unclustered basic workload tests shows that on both micro instances and large instances basic workload tests timeout and/or fail. On micro instances, this is shows up particularly quickly even in a single node localhost situation.

      Steps:

      • Set up EC2 instance
      • Install Couchbase Server 2.0 DP3
      • Run /opt/couchbase/bin/memcachetest -l -t 32 -h localhost:11211

      Observed behavior:
      Many errors such as:
      ASCII set failure: SERVER_ERROR proxy downstream timeout
      ASCII set failure: SERVER_ERROR proxy downstream timeout 10.48.43.67
      ASCII set failure: SERVER_ERROR proxy out of downstreams
      ASCII set failure: SERVER_ERROR proxy downstream timeout
      <3944> isn't there anymore
      ...

      Also note that the observed throughput would start high, slow down, speed up, etc.

      Expected behavior:
      Workload should degrade or possibly timeout in an extreme workload case, but not be issuing out of downstreams. The server should definitely handle this workload without errors.

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            Unassigned Unassigned
            ingenthr Matt Ingenthron
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            Dates

              Created:
              Updated:
              Resolved:

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