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Hadoop QA commented on YARN-3491: --------------------------------- {color:red}-1 overall{color}. Here are the results of testing the latest attachment http://issues.apache.org/jira/secure/attachment/12726118/YARN-3491.000.patch against trunk revision 76e7264. {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:green}+1 core tests{color}. The patch passed unit tests in hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager. Test results: https://builds.apache.org/job/PreCommit-YARN-Build/7374//testReport/ Console output: https://builds.apache.org/job/PreCommit-YARN-Build/7374//console This message is automatically generated. > PublicLocalizer#addResource is too slow. > ---------------------------------------- > > Key: YARN-3491 > URL: https://issues.apache.org/jira/browse/YARN-3491 > Project: Hadoop YARN > Issue Type: Improvement > Components: nodemanager > Affects Versions: 2.7.0 > Reporter: zhihai xu > Assignee: zhihai xu > Priority: Critical > Attachments: YARN-3491.000.patch > > > Based on the profiling, The bottleneck in PublicLocalizer#addResource is > getInitializedLocalDirs. getInitializedLocalDirs call checkLocalDir. > checkLocalDir is very slow which is about 10 ms. > The total delay will be approximately number of local dirs * 10 ms. > This delay will be added for each public resource localization. > Because PublicLocalizer#addResource is slow, the thread pool can't be fully > utilized. Instead of doing public resource localization in > parallel(multithreading), public resource localization is serialized most of > the time. > And also PublicLocalizer#addResource is running in Dispatcher thread, > So the Dispatcher thread will be blocked by PublicLocalizer#addResource for > long time. -- This message was sent by Atlassian JIRA (v6.3.4#6332)