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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2815) support for DeleteOnExit
Date Thu, 21 Feb 2008 01:39:43 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12570919#action_12570919
] 

Konstantin Shvachko commented on HADOOP-2815:
---------------------------------------------

Directory is just a path component from the user point of view. HDFS automatically creates
directories if they do not exist when a file is created.
There are no leases, open and close operations for directories.
So, no - directories are not recycled automatically. This is probably another side effect
to be aware of that even if a file is automatically
recycled during DFSClient.close() the directories created as a part of the file create will
remain in the system.

> support for DeleteOnExit
> ------------------------
>
>                 Key: HADOOP-2815
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2815
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: Olga Natkovich
>
> Pig creates temp files that it wants to be removed at the end of the processing. The
code that removes the temp file is in the shutdown hook so that they get removed both under
normal shutdown as well as when process gets killed.
> The problem that we are seeing is that by the time the code is called the DFS might already
be closed and the delete fails leaving temp files behind. Since we have no control over the
shutdown order, we have no way to make sure that the files get removed.
> One way to solve this issue is to be able to mark the files as temp files so that hadoop
can remove them during its shutdown.
> The stack trace I am seeing is
> at org.apache.hadoop.dfs.DFSClient.checkOpen(DFSClient.java:158)
>         at org.apache.hadoop.dfs.DFSClient.delete(DFSClient.java:417)
>         at org.apache.hadoop.dfs.DistributedFileSystem.delete(DistributedFileSystem.java:144)
>         at org.apache.pig.backend.hadoop.datastorage.HPath.delete(HPath.java:96)
>         at org.apache.pig.impl.io.FileLocalizer$1.run(FileLocalizer.java:275)

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