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https://reviews.apache.org/r/45619/
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Review request for Ambari, Andrew Onischuk, Mahadev Konar, and Sumit Mohanty.


Bugs: AMBARI-15677
    https://issues.apache.org/jira/browse/AMBARI-15677


Repository: ambari


Description
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We need to make sure the Namenode CMS GC settings are correct.
Ambari does not currently set -XX:CMSInitiatingOccupancyFraction=70 or 
-XX:+UseCMSInitiatingOccupancyOnly. The NewSize needs also some tweaking: it 
should be 1/8th to 1/10th of the namenode heap size in general, but it looks 
like we would cap at 8 gb like here (this NN has 112 GB heap).


Diffs
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ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/configuration/hadoop-env.xml
 cade180 
  
ambari-server/src/main/resources/stacks/HDP/2.2/services/HDFS/configuration/hadoop-env.xml
 7429738 
  
ambari-server/src/main/resources/stacks/HDP/2.3/services/HDFS/configuration/hadoop-env.xml
 80b545c 

Diff: https://reviews.apache.org/r/45619/diff/


Testing
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mvn clean test


Thanks,

Vitalyi Brodetskyi

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