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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2003) Separate FSEditLog reading logic from editLog memory state building logic
Date Wed, 08 Jun 2011 20:17:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13046187#comment-13046187
] 

Todd Lipcon commented on HDFS-2003:
-----------------------------------

bq. @Todd could you give this a quick test with your benchmark to make sure it doesn't hit
performance.

Yep, ran the tests with latest patch and there's no discernible perf hit with the patch.


Will look over your diff 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.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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