[jira] [Commented] (SAMZA-1645) A few issues found by BEAM stress test

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SAMZA-1645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16434124#comment-16434124 ] 

ASF GitHub Bot commented on SAMZA-1645:
---------------------------------------

GitHub user xinyuiscool opened a pull request:

    https://github.com/apache/samza/pull/469

    SAMZA-1645: A few issues found by BEAM stress test

    1. Revert the priority set to intermediate streams.
    2. Fix a watermark propagation condition

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/xinyuiscool/samza SAMZA-1645

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/samza/pull/469.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #469
    
----
commit 54c2b4f01c85e40c83bb27d1d03aad22b3e680a3
Author: xinyuiscool <xi...@...>
Date:   2018-04-11T01:46:23Z

    SAMZA-1645: A few issues found by BEAM stress test

----


> A few issues found by BEAM stress test
> --------------------------------------
>
>                 Key: SAMZA-1645
>                 URL: https://issues.apache.org/jira/browse/SAMZA-1645
>             Project: Samza
>          Issue Type: Bug
>            Reporter: Xinyu Liu
>            Assignee: Xinyu Liu
>            Priority: Major
>
> # Setting high priority on intermediate streams caused starvation on certain tasks. Due to the intermediate message kept coming, the input streams are not consumed and watermark messages are not generated, which makes downstream accumulates large state and makes processing slower thus make starvation worse.
>  # Watermark broadcast needs to check whether the watermark is advanced.



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