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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1179) Implement a file change log
Date Fri, 28 May 2010 05:33:37 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12872858#action_12872858
] 

dhruba borthakur commented on HDFS-1179:
----------------------------------------

A very high-level idea that comes to mind is to evaluate if the FCL can be a normal file in
HDFS itself. Then apps can read the contents of this file to determine what has changed in
the namespace. Of course, the file has to roll periodically so that it does not become impractically
large!

> Implement a file change log
> ---------------------------
>
>                 Key: HDFS-1179
>                 URL: https://issues.apache.org/jira/browse/HDFS-1179
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>
> The File Change Log (FCL) is a construct that records all metadata changes in a file
system (http://en.wikipedia.org/wiki/File_change_log). This JIRA is to discuss various high-level
approaches to implementing such a FCL for HDFS.

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