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From "Chun Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-504) HDFS updates the modification time of a file when the file is closed.
Date Thu, 30 Jul 2009 18:17:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737210#action_12737210
] 

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

    [junit] Running org.apache.hadoop.hdfs.TestSetTimes
    [junit] Tests run: 2, Failures: 0, Errors: 0, Time elapsed: 9.048 sec


> 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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