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https://issues.apache.org/jira/browse/HDFS-854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12846268#action_12846268
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Hadoop QA commented on HDFS-854:
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-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12438985/HDFS-854.patch.1
against trunk revision 923467.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 3 new or modified tests.
+1 javadoc. The javadoc tool did not generate any warning messages.
+1 javac. The applied patch does not increase the total number of javac
compiler warnings.
+1 findbugs. The patch does not introduce any new Findbugs warnings.
+1 release audit. The applied patch does not increase the total number of
release audit warnings.
-1 core tests. The patch failed core unit tests.
-1 contrib tests. The patch failed contrib unit tests.
Test results:
http://hudson.zones.apache.org/hudson/job/Hdfs-Patch-h5.grid.sp2.yahoo.net/270/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Hdfs-Patch-h5.grid.sp2.yahoo.net/270/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://hudson.zones.apache.org/hudson/job/Hdfs-Patch-h5.grid.sp2.yahoo.net/270/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://hudson.zones.apache.org/hudson/job/Hdfs-Patch-h5.grid.sp2.yahoo.net/270/console
This message is automatically generated.
> Datanode should scan devices in parallel to generate block report
> -----------------------------------------------------------------
>
> Key: HDFS-854
> URL: https://issues.apache.org/jira/browse/HDFS-854
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Affects Versions: 0.22.0
> Reporter: dhruba borthakur
> Assignee: Dmytro Molkov
> Fix For: 0.22.0
>
> Attachments: HDFS-854.patch, HDFS-854.patch.1
>
>
> A Datanode should scan its disk devices in parallel so that the time to
> generate a block report is reduced. This will reduce the startup time of a
> cluster.
> A datanode has 12 disk (each of 1 TB) to store HDFS blocks. There is a total
> of 150K blocks on these 12 disks. It takes the datanode upto 20 minutes to
> scan these devices to generate the first block report.
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