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https://issues.apache.org/jira/browse/HDFS-362?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uma Maheswara Rao G updated HDFS-362:
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Status: Patch Available (was: Open)
Hi Eli,
I have updated the patch, can you please take a look.
Also, i have changed the layoutversion to -39.
With this change i have verified the following scenarios manually.
*Scenario 1:*
After the version change, verified the fsimgae loading.
Successfully able to writing the fields and loading back. This i checked
with eclipse debug points.
*Scenario 2:*
a)Created the namespace with -38 version with mutiple FS operations.
b)Applied the patch which contains the version updation to -39.
c)started the NN with upgrade option.
Observation: Successfully able to load and start.
And also finalized and rollbacked.
Since old version of fsImage is required for upgrade verification, i have done
the tests manually. And existing tests used for regression.
--thanks
> FSEditLog should not writes long and short as UTF8 and should not use
> ArrayWritable 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.patch
>
>
> In FSEditLog,
> - 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 hold
> all the items and then writes the ArrayWritable object.
> These result creating many intermediate objects which affects Namenode CPU
> performance and Namenode restart.
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