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https://issues.apache.org/jira/browse/IMPALA-9274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17011314#comment-17011314
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ASF subversion and git services commented on IMPALA-9274:
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Commit 1bf92120dd4cf7df3fd9764ef9fcb2b061b87644 in impala's branch
refs/heads/master from Tim Armstrong
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=1bf9212 ]
IMPALA-9274: cyclic barrier implementation
This adds a synchronisation utility CyclicBarrier, which will be
used in IMPALA-9156 for orchestrating the hash join algorithm
with a shared build side and multiple hash join nodes.
Testing:
Add a unit test for the barier class.
Change-Id: Id5c8cc6b3023d2dc03c8116d462440c5e25c3bb0
Reviewed-on: http://gerrit.cloudera.org:8080/14973
Tested-by: Impala Public Jenkins <[email protected]>
Reviewed-by: Tim Armstrong <[email protected]>
> 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
>
> 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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