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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10950) rework heap management vars
Date Sat, 07 Mar 2015 19:44:38 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: 
* HADOOP_HEAPSIZE variable has been deprecated  (It will still be honored if set, but expect
it to go away in the future).    In its place, HADOOP_HEAPSIZE_MAX and HADOOP_HEAPSIZE_MIN
have been introduced to set Xmx and Xms, respectively. 

* The internal variable JAVA_HEAP_MAX has been removed.

* 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. 

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

  was:
* HADOOP_HEAPSIZE variable has been deprecated  (It will still be honored if set, but expect
it to go away in the future).    In its place, HADOOP_HEAPSIZE_MAX and HADOOP_HEAPSIZE_MIN
have been introduced to set Xmx and Xms, respectively. 

* The internal variable JAVA_HEAP_MAX has been removed.

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

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


> rework  heap management  vars
> -----------------------------
>
>                 Key: HADOOP-10950
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10950
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: scripts
>            Reporter: Allen Wittenauer
>            Assignee: John Smith
>              Labels: scripts
>             Fix For: 3.0.0
>
>         Attachments: HADOOP-10950-01.patch, HADOOP-10950-02.patch, HADOOP-10950-03.patch,
HADOOP-10950-04.patch, HADOOP-10950.patch
>
>
> 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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