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Posted to issues@tez.apache.org by "Siddharth Seth (JIRA)" <ji...@apache.org> on 2014/02/26 20:03:24 UTC

[jira] [Commented] (TEZ-892) Buffer events to Tasks until they ready to be started

    [ https://issues.apache.org/jira/browse/TEZ-892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13913333#comment-13913333 ] 

Siddharth Seth commented on TEZ-892:
------------------------------------

Dupe of TEZ-715. Also, another jira after that - in terms of queuing events.

> Buffer events to Tasks until they ready to be started
> -----------------------------------------------------
>
>                 Key: TEZ-892
>                 URL: https://issues.apache.org/jira/browse/TEZ-892
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Bikas Saha
>            Assignee: Bikas Saha
>         Attachments: TEZ-892.1.patch
>
>
> Tasks dont start until the VertexManager has decided parallelism and allowed them to start. Until that time the task events should be buffered in the vertex. Without this routing task events can race with changing task parallelism. Thus some routed events may have missing destination tasks and cause NPE.



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