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Hadoop QA commented on YARN-3633: --------------------------------- \\ \\ | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem || Runtime || Comment || | {color:blue}0{color} | pre-patch | 14m 52s | Pre-patch trunk compilation is healthy. | | {color:green}+1{color} | @author | 0m 0s | The patch does not contain any @author tags. | | {color:green}+1{color} | tests included | 0m 0s | The patch appears to include 1 new or modified test files. | | {color:green}+1{color} | javac | 7m 34s | There were no new javac warning messages. | | {color:green}+1{color} | javadoc | 9m 41s | There were no new javadoc warning messages. | | {color:green}+1{color} | release audit | 0m 24s | The applied patch does not increase the total number of release audit warnings. | | {color:red}-1{color} | checkstyle | 0m 51s | The applied patch generated 8 new checkstyle issues (total was 120, now 126). | | {color:red}-1{color} | whitespace | 0m 1s | The patch has 1 line(s) that end in whitespace. Use git apply --whitespace=fix. | | {color:green}+1{color} | install | 1m 34s | mvn install still works. | | {color:green}+1{color} | eclipse:eclipse | 0m 33s | The patch built with eclipse:eclipse. | | {color:red}-1{color} | findbugs | 1m 17s | The patch appears to introduce 1 new Findbugs (version 3.0.0) warnings. | | {color:green}+1{color} | yarn tests | 50m 3s | Tests passed in hadoop-yarn-server-resourcemanager. | | | | 86m 54s | | \\ \\ || Reason || Tests || | FindBugs | module:hadoop-yarn-server-resourcemanager | | | Inconsistent synchronization of org.apache.hadoop.yarn.server.resourcemanager.recovery.FileSystemRMStateStore.isHDFS; locked 66% of time Unsynchronized access at FileSystemRMStateStore.java:66% of time Unsynchronized access at FileSystemRMStateStore.java:[line 156] | \\ \\ || Subsystem || Report/Notes || | Patch URL | http://issues.apache.org/jira/secure/attachment/12733674/YARN-3633.patch | | Optional Tests | javadoc javac unit findbugs checkstyle | | git revision | trunk / 0790275 | | checkstyle | https://builds.apache.org/job/PreCommit-YARN-Build/7988/artifact/patchprocess/diffcheckstylehadoop-yarn-server-resourcemanager.txt | | whitespace | https://builds.apache.org/job/PreCommit-YARN-Build/7988/artifact/patchprocess/whitespace.txt | | Findbugs warnings | https://builds.apache.org/job/PreCommit-YARN-Build/7988/artifact/patchprocess/newPatchFindbugsWarningshadoop-yarn-server-resourcemanager.html | | hadoop-yarn-server-resourcemanager test log | https://builds.apache.org/job/PreCommit-YARN-Build/7988/artifact/patchprocess/testrun_hadoop-yarn-server-resourcemanager.txt | | Test Results | https://builds.apache.org/job/PreCommit-YARN-Build/7988/testReport/ | | Java | 1.7.0_55 | | uname | Linux asf907.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux | | Console output | https://builds.apache.org/job/PreCommit-YARN-Build/7988/console | This message was automatically generated. > With Fair Scheduler, cluster can logjam when there are too many queues > ---------------------------------------------------------------------- > > Key: YARN-3633 > URL: https://issues.apache.org/jira/browse/YARN-3633 > Project: Hadoop YARN > Issue Type: Bug > Components: fairscheduler > Affects Versions: 2.6.0 > Reporter: Rohit Agarwal > Assignee: Rohit Agarwal > Priority: Critical > Attachments: YARN-3633.patch > > > It's possible to logjam a cluster by submitting many applications at once in > different queues. > For example, let's say there is a cluster with 20GB of total memory. Let's > say 4 users submit applications at the same time. The fair share of each > queue is 5GB. Let's say that maxAMShare is 0.5. So, each queue has at most > 2.5GB memory for AMs. If all the users requested AMs of size 3GB - the > cluster logjams. Nothing gets scheduled even when 20GB of resources are > available. -- This message was sent by Atlassian JIRA (v6.3.4#6332)