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https://reviews.apache.org/r/46178/
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Review request for Ambari, Dmytro Sen, Sumit Mohanty, and Sid Wagle.


Bugs: AMBARI-15872
    https://issues.apache.org/jira/browse/AMBARI-15872


Repository: ambari


Description
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For large clusters, this is a very useful optimization that can be employed.

Added an optional config (Not available through default from the stack)

ams-site : timeline.metrics.tables.durability
Valid values it can take : SKIP_WAL / SYNC_WAL / ASYNC_WAL / FSYNC_WAL


Diffs
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ambari-metrics/ambari-metrics-timelineservice/src/main/java/org/apache/hadoop/yarn/server/applicationhistoryservice/metrics/timeline/PhoenixHBaseAccessor.java
 813387f 
  
ambari-metrics/ambari-metrics-timelineservice/src/main/java/org/apache/hadoop/yarn/server/applicationhistoryservice/metrics/timeline/TimelineMetricConfiguration.java
 0ebc248 
  
ambari-metrics/ambari-metrics-timelineservice/src/test/java/org/apache/hadoop/yarn/server/applicationhistoryservice/metrics/timeline/ITPhoenixHBaseAccessor.java
 89f3fbe 

Diff: https://reviews.apache.org/r/46178/diff/


Testing
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Manually tested.

Added unit test.


Thanks,

Aravindan Vijayan

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