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https://issues.apache.org/jira/browse/HADOOP-18793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17740662#comment-17740662
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Steve Loughran commented on HADOOP-18793:
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should be done in cleanupStagingDirs()
can you do a run at debug and make sure that "Cleaning up work path" is
printed?
we should always be able to delete the dir as if the uuids are not unique then
the jobs are corrupted.
> S3A StagingCommitter does not clean up staging-uploads directory
> ----------------------------------------------------------------
>
> Key: HADOOP-18793
> URL: https://issues.apache.org/jira/browse/HADOOP-18793
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/s3
> Affects Versions: 3.2.2
> Reporter: Harunobu Daikoku
> Priority: Minor
>
> When setting up StagingCommitter and its internal FileOutputCommitter, a
> temporary directory that holds MPU information will be created on the default
> FS, which by default is to be
> /user/${USER}/tmp/staging/${USER}/${UUID}/staging-uploads.
> On a successful job commit, its child directory (_temporary) will be [cleaned
> up|https://github.com/apache/hadoop/blob/a36d8adfd18e88f2752f4387ac4497aadd3a74e7/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/commit/staging/StagingCommitter.java#L516]
> properly, but ${UUID}/staging-uploads will remain.
> This will result in having too many empty ${UUID}/staging-uploads directories
> under /user/${USER}/tmp/staging/${USER}, and will eventually cause an issue
> in an environment where the max number of items in a directory is capped
> (e.g. by dfs.namenode.fs-limits.max-directory-items in HDFS).
> {noformat}
> The directory item limit of /user/${USER}/tmp/staging/${USER} is exceeded:
> limit=1048576 items=1048576
> at
> org.apache.hadoop.hdfs.server.namenode.FSDirectory.verifyMaxDirItems(FSDirectory.java:1205)
> {noformat}
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