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  1. Kudu
  2. KUDU-2918

Rebalancer can fail when a service queue is full

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    Details

    • Type: Bug
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 1.11.0
    • Fix Version/s: None
    • Component/s: CLI, ksck

      Description

      The various low-level RPCs issued by ksck aren't retried if the corresponding service queues are full. These include GetConsensusState, GetStatus, and ListTablets.

      Without retries, ksck (and the rebalancer) can fail midway:

      I0812 11:21:10.669682 42799 rebalancer.cc:831] tablet d729fb149e804696a0862adacb725d66: a0dca75bbbfb4de69616694834adf930 -> 24d0eb73b3c64a0f901ae092186b3439 move is abandoned: Remote error: Service unavailable: GetConsensusState request on kudu.consensus.ConsensusService from 10.17.182.15:50754 dropped due to backpressure. The service queue is full; it has 50 items.
      I0812 11:21:10.871894 42799 rebalancer.cc:239] re-synchronizing cluster state
      Illegal state: tablet server 0d88ff7360b74d1e81cd2ccd41fab8a5 (foo.bar.com:7050): unacceptable health status UNAVAILABLE
      

      The helper classes in rpc/rpc.h may be useful here.

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            • Assignee:
              Unassigned
              Reporter:
              adar Adar Dembo
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              Dates

              • Created:
                Updated: