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

["ASF subversion and git services (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IMPALA-9274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17011314#comment-17011314 ] 

ASF subversion and git services commented on IMPALA-9274:
---------------------------------------------------------

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 <im...@cloudera.com>
Reviewed-by: Tim Armstrong <ta...@cloudera.com>


> 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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