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  1. Kudu
  2. KUDU-430 Consistent Operations
  3. KUDU-1127

Avoid holding RPC handler threads on replicas that are part of a degraded tablet

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    Details

    • Type: Sub-task
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: Private Beta
    • Fix Version/s: 1.2.0
    • Component/s: tserver
    • Labels:
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    • Target Version/s:

      Description

      If the client performs a snapshot scan, we may need to wait for the leader to tell us that the timestamp is "safe". If the majority of nodes in a tablet are down, this will never happen. After KUDU-689, well wait with a deadline, but even this multi-second wait will end up blocking a lot of RPC handlers, potentially preventing other useful work from getting done.

      We should probably short-circuit the wait in the case that we haven't heard from any leader within the election timeout and just respond immediately. Alternatively, we could make this an async callback vs a blocking wait on handler.

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            • Assignee:
              dralves David Alves
              Reporter:
              tlipcon Todd Lipcon
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              • Created:
                Updated:
                Resolved: