[jira] [Commented] (TRAFODION-2046) change DTM's memoryUsageChore default settings to enable memory threthold

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

    [ https://issues.apache.org/jira/browse/TRAFODION-2046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15323933#comment-15323933 ] 

ASF GitHub Bot commented on TRAFODION-2046:
-------------------------------------------

GitHub user traflm opened a pull request:

    https://github.com/apache/incubator-trafodion/pull/537

    [TRAFODION-2046]change DTM's memoryUsageChore default settings to ena…

    …ble memory threthold
    
    Change the default behavior of DTM to restrict the memory usage in Region Server to 90%, if above that threshold, stop all new transaction operations until memory released under the threshold.

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

    $ git pull https://github.com/traflm/incubator-trafodion TRAFODION-2046

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

    https://github.com/apache/incubator-trafodion/pull/537.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 #537
    
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commit c849baf89221a3f943e3d66d303390d0cc453fa8
Author: Liu Ming <ov...@sina.com>
Date:   2016-06-10T06:07:34Z

    [TRAFODION-2046]change DTM's memoryUsageChore default settings to enable memory threthold

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> change DTM's memoryUsageChore default settings to enable memory threthold
> -------------------------------------------------------------------------
>
>                 Key: TRAFODION-2046
>                 URL: https://issues.apache.org/jira/browse/TRAFODION-2046
>             Project: Apache Trafodion
>          Issue Type: Improvement
>            Reporter: liu ming
>            Assignee: liu ming
>
> DTM provide MemoryUsageChore to monitor the memory pressure in a RegionServer, when memory is beyond a defined threshold, it will give a warning or prevent new operations based on a flag.
> By default, the threshold is now 100%, and the flag is just warning. So that means DTM coprocessor can use all RS memory and when it find memory pressure , just print warning, instead of control new transaction.
> This will lead to un-predictable behavior for certain fat transaction.
> It is better to change the default setting to enable protection.



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