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https://issues.apache.org/jira/browse/TWILL-78?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14027190#comment-14027190
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Erick Tryzelaar commented on TWILL-78:
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I've pushed up an implementation of this here:
https://reviews.apache.org/r/22171/.
> 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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