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https://issues.apache.org/jira/browse/TRAFODION-2046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15325779#comment-15325779
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ASF GitHub Bot commented on TRAFODION-2046:
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GitHub user traflm opened a pull request:
https://github.com/apache/incubator-trafodion/pull/542
[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-2046-1
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-trafodion/pull/542.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 #542
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commit 31d0bea37b7b0f09ba84495f28a6f9044e7368d6
Author: Liu Ming <ovis_p...@sina.com>
Date: 2016-06-11T08:47:41Z
[TRAFODION-2046]change DTM's memoryUsageChore default settings to enable
memory threthold
----
> 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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