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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10950) rework heap management vars
Date Wed, 20 Aug 2014 14:48:27 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-10950?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Allen Wittenauer updated HADOOP-10950:
--------------------------------------

    Release Note: 
* The default heap sizes have been removed and the HADOOP_HEAPSIZE variable has been deprecated
 (It will still be honored if set, but expect it to go away in the future).  This will allow
for the JVM to use auto-tuning based upon the memory size of the host.  To re-enable the old
default, configure HADOOP_HEAPSIZE_MAX="1g" in hadoop-env.sh.

* All heap size variables now support units.  If the variable is only a number, the size assumed
to be in megabytes.

  was:The default heap sizes have been removed.  This will allow for the JVM to use auto-tuning
based upon the memory size of the host.  To re-enable the old default, configure HADOOP_HEAPSIZE_MAX="1g"
in hadoop-env.sh.


> rework  heap management  vars
> -----------------------------
>
>                 Key: HADOOP-10950
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10950
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: scripts
>            Reporter: Allen Wittenauer
>              Labels: scripts
>
> Post-HADOOP-9902, we need to rework how heap is configured for small footprint machines,
deprecate some options, introduce new ones for greater flexibility.



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