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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1866) distcp requires large heapsize when copying many files
Date Mon, 10 Sep 2007 16:47:29 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12526187
] 

Owen O'Malley commented on HADOOP-1866:
---------------------------------------

Koji, I assume this was on 0.13 or 0.14? The new distcp in 0.15 is almost completely re-written,
so the version matters a lot.

> distcp requires large heapsize when copying many files
> ------------------------------------------------------
>
>                 Key: HADOOP-1866
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1866
>             Project: Hadoop
>          Issue Type: Bug
>          Components: util
>            Reporter: Koji Noguchi
>            Priority: Minor
>
> Trying to distcp 1.5 million files with 1G client heapsize,  failed with outofmemory.
> Exception in thread "main" java.lang.OutOfMemoryError: GC overhead limit
> exceeded
>        at java.util.regex.Pattern.compile(Pattern.java:1438)
>        at java.util.regex.Pattern.<init>(Pattern.java:1130)
>        at java.util.regex.Pattern.compile(Pattern.java:846)
>        at java.lang.String.replace(String.java:2208)
>        at org.apache.hadoop.fs.Path.normalizePath(Path.java:147)
>        at org.apache.hadoop.fs.Path.initialize(Path.java:137)
>        at org.apache.hadoop.fs.Path.<init>(Path.java:126)
>        at org.apache.hadoop.dfs.DfsPath.<init>(DfsPath.java:32)
>        at org.apache.hadoop.dfs.DistributedFileSystem$RawDistributedFileSystem.listPaths(DistributedFileSystem.java:214)
>        at org.apache.hadoop.fs.FileSystem.listPaths(FileSystem.java:483)
>        at org.apache.hadoop.fs.FileSystem.listPaths(FileSystem.java:496)
>        at org.apache.hadoop.fs.ChecksumFileSystem.listPaths(ChecksumFileSystem.java:539)
>        at org.apache.hadoop.util.CopyFiles$FSCopyFilesMapper.setup(CopyFiles.java:327)
>        at org.apache.hadoop.util.CopyFiles.copy(CopyFiles.java:762)
>        at org.apache.hadoop.util.CopyFiles.run(CopyFiles.java:808)
>        at org.apache.hadoop.util.ToolBase.doMain(ToolBase.java:189)
>        at org.apache.hadoop.util.CopyFiles.main(CopyFiles.java:818)
> It would be nice if distcp doesn't require gigs of heapsize when copying large amount
of files.

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