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https://issues.apache.org/jira/browse/YARN-2996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14260891#comment-14260891
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Hadoop QA commented on YARN-2996:
---------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12689441/YARN-2996.001.patch
against trunk revision 249cc90.
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:red}-1 tests included{color}. The patch doesn't appear to include
any new or modified tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. There were no new javadoc warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with
eclipse:eclipse.
{color:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 2.0.3) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:red}-1 core tests{color}. The patch failed these unit tests in
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager:
org.apache.hadoop.yarn.server.resourcemanager.TestRMRestart
org.apache.hadoop.yarn.server.resourcemanager.TestWorkPreservingRMRestart
org.apache.hadoop.yarn.server.resourcemanager.TestRM
Test results:
https://builds.apache.org/job/PreCommit-YARN-Build/6213//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/6213//console
This message is automatically generated.
> Refine some fs operations in FileSystemRMStateStore to improve performance
> --------------------------------------------------------------------------
>
> Key: YARN-2996
> URL: https://issues.apache.org/jira/browse/YARN-2996
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: resourcemanager
> Reporter: Yi Liu
> Assignee: Yi Liu
> Attachments: YARN-2996.001.patch
>
>
> In {{FileSystemRMStateStore}}, we can refine some fs operations to improve
> performance:
> *1.* There are several places invoke {{fs.exists}}, then
> {{fs.getFileStatus}}, we can merge them to save one RPC call
> {code}
> if (fs.exists(versionNodePath)) {
> FileStatus status = fs.getFileStatus(versionNodePath);
> {code}
> *2.*
> {code}
> protected void updateFile(Path outputPath, byte[] data) throws Exception {
> Path newPath = new Path(outputPath.getParent(), outputPath.getName() +
> ".new");
> // use writeFile to make sure .new file is created atomically
> writeFile(newPath, data);
> replaceFile(newPath, outputPath);
> }
> {code}
> The {{updateFile}} is not good too, it write file to _output\_file_.tmp, then
> rename to _output\_file_.new, then rename it to _output\_file_, we can reduce
> one rename operation.
> Also there is one unnecessary import, we can remove it.
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