[jira] [Created] (IMPALA-5807) Fix possibility of concurrent status reports

["Thomas Tauber-Marshall (JIRA)" <ji...@apache.org>]

Thomas Tauber-Marshall created IMPALA-5807:
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             Summary: Fix possibility of concurrent status reports
                 Key: IMPALA-5807
                 URL: https://issues.apache.org/jira/browse/IMPALA-5807
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
    Affects Versions: Impala 2.10.0
            Reporter: Thomas Tauber-Marshall


The coordinator may receive multiple backend status reports concurrently for a few reasons:
- The backend believes that sending the report failed and retries when in fact the first report did reach the coordinator.
- A report is sent by the reporting thread at the same time that one is sent by Finalize().
- Multiple fragments from the same backend send reports at the same time.

This has the possibility of causing races. One such race was fixed in IMPALA-5749, but we should deal with the underlying issue of concurrent reports in a more complete way, rather than just trying to fix individual races as they become apparent.



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