[
https://issues.apache.org/jira/browse/HDFS-1093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909590#action_12909590
]
Hadoop QA commented on HDFS-1093:
---------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12454396/NNreadwriteLock_trunk_4.txt
against trunk revision 997157.
+1 @author. The patch does not contain any @author tags.
-1 tests included. The patch doesn't appear to include any new or modified
tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
-1 patch. The patch command could not apply the patch.
Console output:
http://hudson.zones.apache.org/hudson/job/Hdfs-Patch-h2.grid.sp2.yahoo.net/240/console
This message is automatically generated.
> Improve namenode scalability by splitting the FSNamesystem synchronized
> section in a read/write lock
> ----------------------------------------------------------------------------------------------------
>
> Key: HDFS-1093
> URL: https://issues.apache.org/jira/browse/HDFS-1093
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Fix For: 0.22.0
>
> Attachments: NNreadwriteLock.txt, NNreadwriteLock_trunk_1.txt,
> NNreadwriteLock_trunk_2.txt, NNreadwriteLock_trunk_3.txt,
> NNreadwriteLock_trunk_4.txt
>
>
> Most critical data structures in the NameNode (NN) are protected by a
> syncronized methods in the FSNamesystem class. This essentially makes
> critical code paths in the NN single-threaded. However, a large percentage of
> the NN calls are listStatus, getBlockLocations, etc which do not change
> internal data structures at all, these are read-only calls. If we change the
> FSNamesystem lock to a read/write lock, many of the above operations can
> occur in parallel, thus improving the scalability of the NN.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
