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From "Omkar Vinit Joshi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-467) Jobs fail during resource localization when public distributed-cache hits unix directory limits
Date Wed, 03 Apr 2013 02:37:16 GMT

    [ https://issues.apache.org/jira/browse/YARN-467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13620535#comment-13620535
] 

Omkar Vinit Joshi commented on YARN-467:
----------------------------------------

I have tested this code for below scenarios
* I used 4 local-dirs to see if the localization gets distributed across them and LocalCacheDirectoryManager

is managing them separately
* I tested for various values of "yarn.nodemanager.local-cache.max-files-per-directory" <=36,
37 , 40 and much larger..
* I modified the cache cleanup interval and cache target size in mb to see older files getting
removed from cache and LocalCacheDirectoryManager's sub directories are getting reused.
* I tested that we never run into a situation where we have more number of files or sub directories
in any local-directory than what is specified in the configuration.
                
> 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, yarn-467-20130328.patch,
yarn-467-20130401.patch, yarn-467-20130402.1.patch, yarn-467-20130402.patch
>
>
> 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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