[jira] Resolved: (HADOOP-2815) Allowing processes to cleanup dfs on shutdown

["Robert Chansler (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-2815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Chansler resolved HADOOP-2815.
-------------------------------------

    Resolution: Won't Fix

Managing transient files for applications is a conversation that should continue, but there seems to be agreement that this proposal is not the right thing.

I did confirm that this is not a critical issue for Pig in 0.16.x, and certainly not a critical issue for 0.16.1.

> Allowing processes to cleanup dfs on shutdown
> ---------------------------------------------
>
>                 Key: HADOOP-2815
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2815
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: Olga Natkovich
>            Assignee: dhruba borthakur
>             Fix For: 0.16.1
>
>
> 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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