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Posted to common-issues@hadoop.apache.org by "Travis Thompson (JIRA)" <ji...@apache.org> on 2014/09/17 02:28:35 UTC

[jira] [Created] (HADOOP-11098) [jdk8] MaxDirectMemorySize default changed between JDK7 and 8

Travis Thompson created HADOOP-11098:
----------------------------------------

             Summary: [jdk8] MaxDirectMemorySize default changed between JDK7 and 8
                 Key: HADOOP-11098
                 URL: https://issues.apache.org/jira/browse/HADOOP-11098
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Travis Thompson


I noticed this because the NameNode UI shows "Max Non Heap Memory" which after some digging I found correlates to MaxDirectMemorySize.

JDK7
{noformat}
Heap Memory used 16.75 GB of 23 GB Heap Memory. Max Heap Memory is 23.7 GB.
Non Heap Memory used 57.32 MB of 67.38 MB Commited Non Heap Memory. Max Non Heap Memory is 130 MB. 
{noformat}

JDK8
{noformat}
Heap Memory used 3.02 GB of 7.65 GB Heap Memory. Max Heap Memory is 23.7 GB.
Non Heap Memory used 103.12 MB of 104.41 MB Commited Non Heap Memory. Max Non Heap Memory is -1 B. 
{noformat}

More information in first comment.



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