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https://issues.apache.org/jira/browse/HDFS-1179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12873066#action_12873066
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Dmytro Molkov commented on HDFS-1179:
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Philip, potentially it can be implemented this way, however it depends on the
requirements from the end consumer of this change log. In case of RAID it will
work perfectly fine with the change log coming at the time of edits roll.
However if there are processes that will benefit from this change and they need
more real time data it seems like this should be implemented in the NameNode
itself.
> 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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