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From "Vitaly Brodetskyi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMBARI-15677) Ambari needs to set HDFS GC settings correctly
Date Sat, 02 Apr 2016 14:57:25 GMT
Vitaly Brodetskyi created AMBARI-15677:
------------------------------------------

             Summary: Ambari needs to set HDFS GC settings correctly
                 Key: AMBARI-15677
                 URL: https://issues.apache.org/jira/browse/AMBARI-15677
             Project: Ambari
          Issue Type: Bug
          Components: ambari-server
    Affects Versions: 2.2.2
            Reporter: Vitaly Brodetskyi
            Assignee: Vitaly Brodetskyi
            Priority: Critical
             Fix For: 2.2.2


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).



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