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Posted to mapreduce-issues@hadoop.apache.org by "Allen Wittenauer (JIRA)" <ji...@apache.org> on 2014/07/30 00:35:39 UTC
[jira] [Resolved] (MAPREDUCE-1374) Reduce memory footprint of
FileSplit
[ https://issues.apache.org/jira/browse/MAPREDUCE-1374?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Allen Wittenauer resolved MAPREDUCE-1374.
-----------------------------------------
Resolution: Fixed
File splits moved to client.
> Reduce memory footprint of FileSplit
> ------------------------------------
>
> Key: MAPREDUCE-1374
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1374
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Affects Versions: 0.20.1, 0.21.0, 0.22.0
> Reporter: Zheng Shao
> Assignee: Zheng Shao
> Attachments: MAPREDUCE-1374.1.patch, MAPREDUCE-1374.2.patch, MAPREDUCE-1374.3.patch
>
>
> We can have many FileInput objects in the memory, depending on the number of mappers.
> It will save tons of memory on JobTracker and JobClient if we intern those Strings for host names.
> {code}
> FileInputFormat.java:
> for (NodeInfo host: hostList) {
> // Strip out the port number from the host name
> - retVal[index++] = host.node.getName().split(":")[0];
> + retVal[index++] = host.node.getName().split(":")[0].intern();
> if (index == replicationFactor) {
> done = true;
> break;
> }
> }
> {code}
> More on String.intern(): http://www.javaworld.com/javaworld/javaqa/2003-12/01-qa-1212-intern.html
> It will also save a lot of memory by changing the class of {{file}} from {{Path}} to {{String}}. {{Path}} contains a {{java.net.URI}} which internally contains ~10 String fields. This will also be a huge saving.
> {code}
> private Path file;
> {code}
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