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https://issues.apache.org/jira/browse/HDFS-2982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13280620#comment-13280620
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Hadoop QA commented on HDFS-2982:
---------------------------------
+1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12528506/HDFS-2982.008.patch
against trunk revision .
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 9 new or modified test
files.
+1 javac. The applied patch does not increase the total number of javac
compiler warnings.
+1 javadoc. The javadoc tool did not generate any warning messages.
+1 eclipse:eclipse. The patch built with eclipse:eclipse.
+1 findbugs. The patch does not introduce any new Findbugs (version 1.3.9)
warnings.
+1 release audit. The applied patch does not increase the total number of
release audit warnings.
+1 core tests. The patch passed unit tests in
hadoop-hdfs-project/hadoop-hdfs
hadoop-hdfs-project/hadoop-hdfs/src/contrib/bkjournal.
+1 contrib tests. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-HDFS-Build/2498//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/2498//console
This message is automatically generated.
> Startup performance suffers when there are many edit log segments
> -----------------------------------------------------------------
>
> Key: HDFS-2982
> URL: https://issues.apache.org/jira/browse/HDFS-2982
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 2.0.0
> Reporter: Todd Lipcon
> Assignee: Colin Patrick McCabe
> Priority: Critical
> Attachments: HDFS-2982.001.patch, HDFS-2982.002.patch,
> HDFS-2982.003.patch, HDFS-2982.004.patch, HDFS-2982.005.patch,
> HDFS-2982.006.patch, HDFS-2982.007.patch, HDFS-2982.008.patch
>
>
> For every one of the edit log segments, it seems like we are calling
> listFiles on the edit log directory inside of {{findMaxTransaction}}. This is
> killing performance, especially when there are many log segments and the
> directory is stored on NFS. It is taking several minutes to start up the NN
> when there are several thousand log segments present.
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