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Date: Wed, 24 Aug 2011 18:00:31 +0000 (UTC)
From: "Uma Maheswara Rao G (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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 <803798785.10074.1314208831092.JavaMail.tomcat@hel.zones.apache.org>
Subject: [jira] [Commented] (HDFS-362) FSEditLog should not writes long and
 short as UTF8 and should not use ArrayWritable for writing non-array items
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    [ https://issues.apache.org/jira/browse/HDFS-362?page=3Dcom.atlassian.j=
ira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D130903=
74#comment-13090374 ]=20

Uma Maheswara Rao G commented on HDFS-362:
------------------------------------------

Hi Todd,

Thanks a lot for taking a look on this patch!
{quote}
Rather than comparing the logVersion variable against the numeric -39 versi=
on, check out LayoutVersion.supports(...) =E2=80=93 makes the code easier t=
o read
{quote}
 Nice suggestion. Addressed in this patch.

Thanks
Uma


> FSEditLog should not writes long and short as UTF8 and should not use Arr=
ayWritable for writing non-array items
> -------------------------------------------------------------------------=
--------------------------------------
>
>                 Key: HDFS-362
>                 URL: https://issues.apache.org/jira/browse/HDFS-362
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Uma Maheswara Rao G
>         Attachments: HDFS-362.1.patch, HDFS-362.2.patch, HDFS-362.2b.patc=
h, HDFS-362.2c.patch, HDFS-362.patch
>
>
> In FSEditLog,=20
> - long and short are first converted to String and are further converted =
to UTF8
> - For some non-array items, it first create an ArrayWritable object to ho=
ld all the items and then writes the ArrayWritable object.
> These result creating many intermediate objects which affects Namenode CP=
U performance and Namenode restart.

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