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From "Devaraj K (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4352) Jobs fail during resource localization when directories in file cache reaches to unix directory limit
Date Tue, 19 Jun 2012 13:48:43 GMT
Devaraj K created MAPREDUCE-4352:
------------------------------------

             Summary: Jobs fail during resource localization when directories in file cache
reaches to unix directory limit
                 Key: MAPREDUCE-4352
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4352
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: nodemanager
    Affects Versions: 2.0.1-alpha, 3.0.0
            Reporter: Devaraj K
            Assignee: Devaraj K


If we have multiple jobs which uses distributed cache with small size of files, the directory
limit reaches before reaching the cache size and fails to create any directories in file cache.
The jobs start failing with the below exception.


{code:xml}
java.io.IOException: mkdir of /tmp/nm-local-dir/usercache/root/filecache/1701886847734194975
failed
	at org.apache.hadoop.fs.FileSystem.primitiveMkdir(FileSystem.java:909)
	at org.apache.hadoop.fs.DelegateToFileSystem.mkdir(DelegateToFileSystem.java:143)
	at org.apache.hadoop.fs.FilterFs.mkdir(FilterFs.java:189)
	at org.apache.hadoop.fs.FileContext$4.next(FileContext.java:706)
	at org.apache.hadoop.fs.FileContext$4.next(FileContext.java:703)
	at org.apache.hadoop.fs.FileContext$FSLinkResolver.resolve(FileContext.java:2325)
	at org.apache.hadoop.fs.FileContext.mkdir(FileContext.java:703)
	at org.apache.hadoop.yarn.util.FSDownload.call(FSDownload.java:147)
	at org.apache.hadoop.yarn.util.FSDownload.call(FSDownload.java:49)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)
{code}

We should have a mechanism to clean the cache files if it crosses specified number of directories
like cache size.

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