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