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Posted to issues@impala.apache.org by "Tim Armstrong (Jira)" <ji...@apache.org> on 2020/01/03 02:05:00 UTC

[jira] [Created] (IMPALA-9274) Implement phased barrier synchronisation construct

Tim Armstrong created IMPALA-9274:
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             Summary: Implement phased barrier synchronisation construct
                 Key: IMPALA-9274
                 URL: https://issues.apache.org/jira/browse/IMPALA-9274
             Project: IMPALA
          Issue Type: Sub-task
            Reporter: Tim Armstrong


We need a synchronisation primitive that allows n threads to synchronise by joining on a barrier, then having the last arriving thread execute some code and then wake up all of the other threads.

This is required for implementing phases of the hash join algorithm.



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