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https://issues.apache.org/jira/browse/HADOOP-10950?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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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 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:
* 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 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: Improvement
> Components: scripts
> Reporter: Allen Wittenauer
> Assignee: Allen Wittenauer
> Labels: scripts
> Attachments: 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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