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Posted to issues@impala.apache.org by "Tim Armstrong (Jira)" <ji...@apache.org> on 2020/01/09 03:14:00 UTC

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

     [ https://issues.apache.org/jira/browse/IMPALA-9274?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Armstrong resolved IMPALA-9274.
-----------------------------------
    Fix Version/s: Impala 3.4.0
       Resolution: Fixed

> 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
>            Assignee: Tim Armstrong
>            Priority: Major
>             Fix For: Impala 3.4.0
>
>
> 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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