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

["liu ming (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TRAFODION-2046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on TRAFODION-2046 started by liu ming.
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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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