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https://issues.apache.org/jira/browse/YARN-2624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14153749#comment-14153749
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Anubhav Dhoot commented on YARN-2624:
-------------------------------------
What we see is a bunch of preexisting local resource cache directories conflict
with the new resource download. The destination directory being chosen via
uniqueNumberGenerator is choosing one of these and without
[HADOOP-9438|https://issues.apache.org/jira/browse/HADOOP-9438] we dont know
until the rename fails.
Resetting uniqueNumberGenerator based on recoverResource does not seem to be
enough. We may need to check the state of the NM's cache directory and reset to
the highest number in the directory
> Resource Localization fails on a cluster due to existing cache directories
> --------------------------------------------------------------------------
>
> Key: YARN-2624
> URL: https://issues.apache.org/jira/browse/YARN-2624
> Project: Hadoop YARN
> Issue Type: Bug
> Components: nodemanager
> Reporter: Anubhav Dhoot
> Assignee: Anubhav Dhoot
>
> We have found resource localization fails on a cluster with following error
> in certain cases.
> {noformat}
> INFO
> org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService:
> Failed to download rsrc { {
> hdfs://<blahhostname>:8020/tmp/hive-hive/hive_2014-09-29_14-55-45_184_6531377394813896912-12/-mr-10004/95a07b90-2448-48fc-bcda-cdb7400b4975/map.xml,
> 1412027745352, FILE, null
> },pending,[(container_1411670948067_0009_02_000001)],443533288192637,DOWNLOADING}
> java.io.IOException: Rename cannot overwrite non empty destination directory
> /data/yarn/nm/filecache/27
> at
> org.apache.hadoop.fs.AbstractFileSystem.renameInternal(AbstractFileSystem.java:716)
> at org.apache.hadoop.fs.FilterFs.renameInternal(FilterFs.java:228)
> at
> org.apache.hadoop.fs.AbstractFileSystem.rename(AbstractFileSystem.java:659)
> at org.apache.hadoop.fs.FileContext.rename(FileContext.java:906)
> at org.apache.hadoop.yarn.util.FSDownload.call(FSDownload.java:366)
> at org.apache.hadoop.yarn.util.FSDownload.call(FSDownload.java:59)
> {noformat}
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