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https://issues.apache.org/jira/browse/HDFS-1295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13018643#comment-13018643
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Hadoop QA commented on HDFS-1295:
---------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12476063/IBR_shortcut_v4atrunk.patch
against trunk revision 1091131.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 15 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 (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 failed these core unit tests:
org.apache.hadoop.hdfs.TestDatanodeBlockScanner
org.apache.hadoop.hdfs.TestFileConcurrentReader
-1 contrib tests. The patch failed contrib unit tests.
+1 system test framework. The patch passed system test framework compile.
Test results:
https://hudson.apache.org/hudson/job/PreCommit-HDFS-Build/346//testReport/
Findbugs warnings:
https://hudson.apache.org/hudson/job/PreCommit-HDFS-Build/346//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output:
https://hudson.apache.org/hudson/job/PreCommit-HDFS-Build/346//console
This message is automatically generated.
> Improve namenode restart times by short-circuiting the first block reports
> from datanodes
> -----------------------------------------------------------------------------------------
>
> Key: HDFS-1295
> URL: https://issues.apache.org/jira/browse/HDFS-1295
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.22.0
> Reporter: dhruba borthakur
> Assignee: Matt Foley
> Fix For: 0.23.0
>
> Attachments: IBR_shortcut_v2a.patch, IBR_shortcut_v3atrunk.patch,
> IBR_shortcut_v4atrunk.patch, IBR_shortcut_v4atrunk.patch,
> IBR_shortcut_v4atrunk.patch, shortCircuitBlockReport_1.txt
>
>
> The namenode restart is dominated by the performance of processing block
> reports. On a 2000 node cluster with 90 million blocks, block report
> processing takes 30 to 40 minutes. The namenode "diffs" the contents of the
> incoming block report with the contents of the blocks map, and then applies
> these diffs to the blocksMap, but in reality there is no need to compute the
> "diff" because this is the first block report from the datanode.
> This code change improves block report processing time by 300%.
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