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  1. Kudu
  2. KUDU-1869

Scans do not work with hybrid time disabled and snapshot reads enabled

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Critical
    • Resolution: Won't Fix
    • Affects Version/s: 1.2.0
    • Fix Version/s: None
    • Component/s: consensus
    • Labels:
    • Environment:
      Centos 6.6

      kudu 1.2.0-cdh5.10.0
      revision 01748528baa06b78e04ce9a799cc60090a821162
      build type RELEASE

      6 nodes, 5 tservers/impalads
    • Target Version/s:

      Description

      With -use_hybrid_clock=false and scanning with SNAPSHOT_READ, all scans appear to be timing out with the following error message:

      [vc0736.halxg.cloudera.com:21000] > SELECT COUNT(*) FROM functional_kudu.alltypes;
      Query: select COUNT(*) FROM functional_kudu.alltypes
      Query submitted at: 2017-02-10 09:50:02 (Coordinator: http://vc0736.halxg.cloudera.com:25000)
      Query progress can be monitored at: http://vc0736.halxg.cloudera.com:25000/query_plan?query_id=ff48eb0af82f057e:f2c1e2f800000000
      WARNINGS: 
      Unable to open scanner: Timed out: unable to retry before timeout: Remote error: Service unavailable: Timed out: could not wait for desired snapshot timestamp to be consistent: Timed out waiting for ts: L: 3632307 to be safe (mode: NON-LEADER). Current safe time: L: 3598991 Physical time difference: None (Logical clock): Remote error: Service unavailable: Timed out: could not wait for desired snapshot timestamp to be consistent: Timed out waiting for ts: L: 3625836 to be safe (mode: NON-LEADER). Current safe time: L: 3593993 Physical time difference: None (Logical clock)
      

      This is a severe issue for Impala which aims to keep SNAPSHOT_READ enabled.

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              • Assignee:
                dralves David Alves
                Reporter:
                mjacobs Matthew Jacobs
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                Dates

                • Created:
                  Updated:
                  Resolved: