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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3400) Facilitate creation of temporary files in HDFS
Date Wed, 21 May 2008 22:55:56 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12598842#action_12598842
] 

Hadoop QA commented on HADOOP-3400:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12382350/deleteOnExit.patch
  against trunk revision 658862.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2510/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2510/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2510/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2510/console

This message is automatically generated.

> Facilitate creation of temporary files in HDFS
> ----------------------------------------------
>
>                 Key: HADOOP-3400
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3400
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: deleteOnExit.patch, deleteOnExit.patch, deleteOnExit.patch
>
>
> There are a set of applications that use HDFS to create temporary files. The application
would ideally like these files to be automatically deleted when the application process exits.
This is similar to the File.deleteOnExit() in the Java API.
> One proposal is to add a new method in FileSystem
> public void deleteOnExit(Path)
>     This API requests that the file or directory denoted by this abstract pathname be
deleted when the virtual machine terminates. Deletion will be attempted only for normal termination
of the virtual machine, as defined by the Java Language Specification. Once deletion has been
requested, it is not possible to cancel the request. This method should therefore be used
with care.
> This method can be implemented entirely in the client side code, e.g. FileSystem.java
will keep a cache of all the pathnames specified by the above API. FileSystem.close will invoke
delete() on all the pathnames found in the cache. 

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