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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-504) HDFS updates the modification time of a file when the file is closed.
Date Fri, 31 Jul 2009 18:26:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737642#action_12737642
] 

Konstantin Shvachko commented on HDFS-504:
------------------------------------------

Could you please run at least the "run-commit-test" target, which is a 10-minute test, rather
than just one.
In general you should run "run-test-hdfs" in order to have higher confidence. This is what
Hudson runs for you, ... when it does.

> 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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