[ https://issues.apache.org/jira/browse/MAPREDUCE-6302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14938989#comment-14938989 ]
Hadoop QA commented on MAPREDUCE-6302: -------------------------------------- \\ \\ | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem || Runtime || Comment || | {color:blue}0{color} | pre-patch | 23m 22s | 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 | 11m 52s | There were no new javac warning messages. | | {color:green}+1{color} | javadoc | 10m 53s | There were no new javadoc warning messages. | | {color:red}-1{color} | release audit | 0m 15s | The applied patch generated 1 release audit warnings. | | {color:red}-1{color} | checkstyle | 2m 0s | The applied patch generated 2 new checkstyle issues (total was 517, now 518). | | {color:red}-1{color} | checkstyle | 2m 24s | The applied patch generated 1 new checkstyle issues (total was 12, now 12). | | {color:red}-1{color} | whitespace | 0m 2s | The patch has 1 line(s) that end in whitespace. Use git apply --whitespace=fix. | | {color:green}+1{color} | install | 1m 30s | mvn install still works. | | {color:green}+1{color} | eclipse:eclipse | 0m 33s | The patch built with eclipse:eclipse. | | {color:green}+1{color} | findbugs | 4m 5s | The patch does not introduce any new Findbugs (version 3.0.0) warnings. | | {color:green}+1{color} | mapreduce tests | 9m 42s | Tests passed in hadoop-mapreduce-client-app. | | {color:green}+1{color} | mapreduce tests | 1m 48s | Tests passed in hadoop-mapreduce-client-core. | | {color:green}+1{color} | yarn tests | 58m 43s | Tests passed in hadoop-yarn-server-resourcemanager. | | | | 125m 14s | | \\ \\ || Subsystem || Report/Notes || | Patch URL | http://issues.apache.org/jira/secure/attachment/12764478/mr-6302-3.patch | | Optional Tests | javadoc javac unit findbugs checkstyle | | git revision | trunk / 6c17d31 | | Release Audit | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6044/artifact/patchprocess/patchReleaseAuditProblems.txt | | checkstyle | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6044/artifact/patchprocess/diffcheckstylehadoop-mapreduce-client-core.txt https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6044/artifact/patchprocess/diffcheckstylehadoop-yarn-server-resourcemanager.txt | | whitespace | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6044/artifact/patchprocess/whitespace.txt | | hadoop-mapreduce-client-app test log | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6044/artifact/patchprocess/testrun_hadoop-mapreduce-client-app.txt | | hadoop-mapreduce-client-core test log | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6044/artifact/patchprocess/testrun_hadoop-mapreduce-client-core.txt | | hadoop-yarn-server-resourcemanager test log | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6044/artifact/patchprocess/testrun_hadoop-yarn-server-resourcemanager.txt | | Test Results | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6044/testReport/ | | Java | 1.7.0_55 | | uname | Linux asf906.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-MAPREDUCE-Build/6044/console | This message was automatically generated. > Incorrect headroom can lead to a deadlock between map and reduce allocations > ----------------------------------------------------------------------------- > > Key: MAPREDUCE-6302 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-6302 > Project: Hadoop Map/Reduce > Issue Type: Bug > Affects Versions: 2.6.0 > Reporter: mai shurong > Assignee: Karthik Kambatla > Priority: Critical > Attachments: AM_log_head100000.txt.gz, AM_log_tail100000.txt.gz, > log.txt, mr-6302-1.patch, mr-6302-2.patch, mr-6302-3.patch, > mr-6302-prelim.patch, queue_with_max163cores.png, queue_with_max263cores.png, > queue_with_max333cores.png > > > I submit a big job, which has 500 maps and 350 reduce, to a > queue(fairscheduler) with 300 max cores. When the big mapreduce job is > running 100% maps, the 300 reduces have occupied 300 max cores in the queue. > And then, a map fails and retry, waiting for a core, while the 300 reduces > are waiting for failed map to finish. So a deadlock occur. As a result, the > job is blocked, and the later job in the queue cannot run because no > available cores in the queue. > I think there is the similar issue for memory of a queue . -- This message was sent by Atlassian JIRA (v6.3.4#6332)