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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5757) refreshNodes with many nodes at the same time could slow down NN
Date Sat, 06 Dec 2014 06:21:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14236636#comment-14236636
] 

Hadoop QA commented on HDFS-5757:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12685508/HDFS-5757.patch
  against trunk revision e227fb8.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  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.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:red}-1 findbugs{color}.  The patch appears to introduce 1 new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:red}-1 core tests{color}.  The following test timeouts occurred in hadoop-hdfs-project/hadoop-hdfs:

org.apache.hadoop.hdfs.server.blockmanagement.TestDatanodeManager

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/8940//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/8940//artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/8940//console

This message is automatically generated.

> refreshNodes with many nodes at the same time could slow down NN
> ----------------------------------------------------------------
>
>                 Key: HDFS-5757
>                 URL: https://issues.apache.org/jira/browse/HDFS-5757
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>         Attachments: HDFS-5757.patch
>
>
> Sometimes we need to decomm a whole rack of nodes at the same time. When the decomm is
in process; NN is slow.
> The reason is when DecommissionManager checks the decomm status, it acquires namesystem's
writer lock and iterates through all DNs; for each DN that is in decommissioning state, it
check if replication is done for all the blocks on the machine via blockManager.isReplicationInProgress;
for large cluster; the number of blocks on the machine could be big.
> The fix could be to have DecommissionManager check for several decomm-in-progress nodes
each time it aquires namesystem's writer lock.



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