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https://issues.apache.org/jira/browse/HADOOP-713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12543656
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Hadoop QA commented on HADOOP-713:
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+1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12369695/optimizeComputeContentLen3.patch
against trunk revision r595563.
@author +1. The patch does not contain any @author tags.
javadoc +1. The javadoc tool did not generate any warning messages.
javac +1. The applied patch does not generate any new compiler warnings.
findbugs +1. The patch does not introduce any new Findbugs warnings.
core tests +1. The patch passed core unit tests.
contrib tests +1. The patch passed contrib unit tests.
Test results:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1118/testReport/
Findbugs warnings:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1118/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1118/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1118/console
This message is automatically generated.
> dfs list operation is too expensive
> -----------------------------------
>
> Key: HADOOP-713
> URL: https://issues.apache.org/jira/browse/HADOOP-713
> Project: Hadoop
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.8.0
> Reporter: Hairong Kuang
> Assignee: dhruba borthakur
> Priority: Blocker
> Fix For: 0.15.1
>
> Attachments: optimizeComputeContentLen.patch,
> optimizeComputeContentLen2.patch, optimizeComputeContentLen3.patch
>
>
> A list request to dfs returns an array of DFSFileInfo. A DFSFileInfo of a
> directory contains a field called contentsLen, indicating its size which
> gets computed at the namenode side by resursively going through its subdirs.
> At the same time, the whole dfs directory tree is locked.
> The list operation is used a lot by DFSClient for listing a directory,
> getting a file's size and # of replicas, and getting the size of dfs. Only
> the last operation needs the field contentsLen to be computed.
> To reduce its cost, we can add a flag to the list request. ContentsLen is
> computed If the flag is set. By default, the flag is false.
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