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Date: Wed, 29 Jul 2009 17:47:14 -0700 (PDT)
From: "Chun Zhang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-504) HDFS updates the modification time of
 a file when the file is closed.
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    [ https://issues.apache.org/jira/browse/HDFS-504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12736943#action_12736943 ] 

Chun Zhang commented on HDFS-504:
---------------------------------

Still queued at http://hudson.zones.apache.org/hudson/job/Hdfs-Patch-Admin/lastSuccessfulBuild/artifact/HDFS_PatchQueue.html.

> HDFS updates the modification time of a file when the file is closed.
> ---------------------------------------------------------------------
>
>                 Key: HDFS-504
>                 URL: https://issues.apache.org/jira/browse/HDFS-504
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.20.1
>            Reporter: Chun Zhang
>            Assignee: Chun Zhang
>            Priority: Minor
>             Fix For: 0.20.1
>
>         Attachments: pathfile.txt, pathfile.txt, pathfile.txt, pathfile.txt
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> Current HDFS updates the modification time of a file when the file is created. We would like to update the modification time of the file when the file is closed after being written to. This helps HDFS Raid to detect file changes more aggressively.
> Solution includes:
> 1. Made changes to closeFile@/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java;
> 2. Added unit test to testTimesAtClose@/org/apache/hadoop/hdfs/TestSetTimes.java.

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