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https://issues.apache.org/jira/browse/MAPREDUCE-4352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13396765#comment-13396765
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Robert Joseph Evans commented on MAPREDUCE-4352:
------------------------------------------------
There is a config in 1.0 for this type of thing. My guess is that it either
was not implemented in 2.0 or the default is too large.
> 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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