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https://issues.apache.org/jira/browse/HADOOP-4780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12657715#action_12657715
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Hadoop QA commented on HADOOP-4780:
-----------------------------------
+1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12396156/Hadoop-4780-2.patch
against trunk revision 727571.
+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 Eclipse classpath. The patch retains Eclipse classpath integrity.
+1 core tests. The patch passed core unit tests.
+1 contrib tests. The patch passed contrib unit tests.
Test results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3752/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3752/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3752/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3752/console
This message is automatically generated.
> Task Tracker burns a lot of cpu in calling getLocalCache
> ---------------------------------------------------------
>
> Key: HADOOP-4780
> URL: https://issues.apache.org/jira/browse/HADOOP-4780
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.19.0
> Reporter: Runping Qi
> Assignee: he yongqiang
> Attachments: Hadoop-4780-2.patch
>
>
> I noticed that many times, a task tracker max up to 6 cpus.
> During that time, iostat shows majority of that was system cpu.
> That situation can last for quite long.
> During that time, I saw a number of threads were in the following state:
> java.lang.Thread.State: RUNNABLE
> at java.io.UnixFileSystem.getBooleanAttributes0(Native Method)
> at
> java.io.UnixFileSystem.getBooleanAttributes(UnixFileSystem.java:228)
> at java.io.File.exists(File.java:733)
> at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:399)
> at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:407)
> at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:407)
> at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:407)
> at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:407)
> at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:407)
> at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:407)
> at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:407)
> at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:407)
> at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:407)
> at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:407)
> at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:407)
> at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:407)
> at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:407)
> at
> org.apache.hadoop.filecache.DistributedCache.getLocalCache(DistributedCache.java:176)
> at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:140)
> I suspect that getLocalCache is too expensive.
> And calling it for every task initialization seems too much waste.
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