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