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https://issues.apache.org/jira/browse/TWILL-78?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13995709#comment-13995709
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Terence Yim commented on TWILL-78:
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Includes the mail discussion thread.
http://mail-archives.apache.org/mod_mbox/twill-dev/201405.mbox/%3CCC5ABC8D-1E6A-439D-9B03-3AFBE5B45EC4%40gmail.com%3E
> Supports distributed barrier for runnables within the same application
> ----------------------------------------------------------------------
>
> Key: TWILL-78
> URL: https://issues.apache.org/jira/browse/TWILL-78
> Project: Apache Twill
> Issue Type: Sub-task
> Components: core, zookeeper
> Reporter: Terence Yim
>
> We already has couple use cases that needed some kind of barrier support to
> have runnables to block at a point until certain number of instances joint
> and then proceed to next step (e.g. Load testing framework, GraphLab, etc.)
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