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https://issues.apache.org/jira/browse/HDFS-2003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13046727#comment-13046727
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Todd Lipcon commented on HDFS-2003:
-----------------------------------
+1, good stuff! I'll commit momentarily
> Separate FSEditLog reading logic from editLog memory state building logic
> -------------------------------------------------------------------------
>
> Key: HDFS-2003
> URL: https://issues.apache.org/jira/browse/HDFS-2003
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: Edit log branch (HDFS-1073)
> Reporter: Ivan Kelly
> Assignee: Ivan Kelly
> Fix For: Edit log branch (HDFS-1073)
>
> Attachments: 2003-delta.txt, HDFS-2003-replicationfix-delta.diff,
> HDFS-2003.diff, HDFS-2003.diff, HDFS-2003.diff, HDFS-2003.diff,
> HDFS-2003.diff, HDFS-2003.diff, HDFS-2003.diff, HDFS-2003.diff,
> hdfs-2003.txt, hdfs-2003.txt, hdfs-2003.txt
>
>
> Currently FSEditLogLoader has code for reading from an InputStream
> interleaved with code which updates the FSNameSystem and FSDirectory. This
> makes it difficult to read an edit log without having a whole load of other
> object initialised, which is problematic if you want to do things like count
> how many transactions are in a file etc.
> This patch separates the reading of the stream and the building of the memory
> state.
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