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https://issues.apache.org/jira/browse/YARN-467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13615908#comment-13615908
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Omkar Vinit Joshi commented on YARN-467:
----------------------------------------
Adding tests to validate the expected behavior :-
* TestHierarchicalDirectory
** testHierarchicalSubDirectoryCreation :- It tests below scenarios
*** Limiting files per directory to
YarnConfiguration.NM_LOCAL_CACHE_NUM_FILES_PER_DIRECTORY ( which includes 36
directories)
*** If a file is removed (decFileCountForPath call) from any subdirectory then
those directories are reused the order in which their state changes to
DirectoryState.VACANT
*** Checks path generation upto 2nd level.
** testMinimumPerDirectoryFileLimit :- This tests if the configuration
parameter is set to a value which is <= 36.
* TestLocalResourcesTrackerImpl
** testMinimumPerDirectoryFileLimit :- It is testing Public resources for
HierarchicalDirectory structure.
> Jobs fail during resource localization when public distributed-cache hits
> unix directory limits
> -----------------------------------------------------------------------------------------------
>
> Key: YARN-467
> URL: https://issues.apache.org/jira/browse/YARN-467
> Project: Hadoop YARN
> Issue Type: Bug
> Components: nodemanager
> Affects Versions: 3.0.0, 2.0.0-alpha
> Reporter: Omkar Vinit Joshi
> Assignee: Omkar Vinit Joshi
> Attachments: yarn-467-20130322.1.patch, yarn-467-20130322.2.patch,
> yarn-467-20130322.3.patch, yarn-467-20130322.patch,
> yarn-467-20130325.1.patch, yarn-467-20130325.path
>
>
> 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 (PUBLIC). The jobs start failing with
> the below exception.
> java.io.IOException: mkdir of /tmp/nm-local-dir/filecache/3901886847734194975
> 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)
> we need to have a mechanism where in we can create directory hierarchy and
> limit number of files per directory.
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