[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering
[ https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14212166#comment-14212166 ] Hudson commented on YARN-2853: -- FAILURE: Integrated in Hadoop-Yarn-trunk-Java8 #5 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk-Java8/5/]) YARN-2853. Fixed a bug in ResourceManager causing apps to hang when the user kill request races with ApplicationMaster finish. Contributed by Jian He. (vinodkv: rev 3651fe1b089851b38be351c00a9899817166bf3e) * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ApplicationMasterService.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRM.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/TestRMAppTransitions.java * hadoop-yarn-project/CHANGES.txt * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMAppImpl.java YARN-2853. Merging to branch-2.6 for hadoop-2.6.0-rc1. (acmurthy: rev d648e60ebab7f1942dba92e9cd2cb62b8d70419b) * hadoop-yarn-project/CHANGES.txt Killing app may hang while AM is unregistering -- Key: YARN-2853 URL: https://issues.apache.org/jira/browse/YARN-2853 Project: Hadoop YARN Issue Type: Bug Reporter: Jian He Assignee: Jian He Fix For: 2.6.0 Attachments: YARN-2853.1.patch, YARN-2853.1.patch, YARN-2853.2.patch, YARN-2853.3.patch When killing an app, app first moves to KILLING state, If RMAppAttempt receives the attempt_unregister event before attempt_kill event, it'll ignore the later attempt_kill event. Hence, RMApp won't be able to move to KILLED state and stays at KILLING state forever. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering
[ https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14212195#comment-14212195 ] Hudson commented on YARN-2853: -- SUCCESS: Integrated in Hadoop-Yarn-trunk #743 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/743/]) YARN-2853. Fixed a bug in ResourceManager causing apps to hang when the user kill request races with ApplicationMaster finish. Contributed by Jian He. (vinodkv: rev 3651fe1b089851b38be351c00a9899817166bf3e) * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/TestRMAppTransitions.java * hadoop-yarn-project/CHANGES.txt * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ApplicationMasterService.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRM.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMAppImpl.java YARN-2853. Merging to branch-2.6 for hadoop-2.6.0-rc1. (acmurthy: rev d648e60ebab7f1942dba92e9cd2cb62b8d70419b) * hadoop-yarn-project/CHANGES.txt Killing app may hang while AM is unregistering -- Key: YARN-2853 URL: https://issues.apache.org/jira/browse/YARN-2853 Project: Hadoop YARN Issue Type: Bug Reporter: Jian He Assignee: Jian He Fix For: 2.6.0 Attachments: YARN-2853.1.patch, YARN-2853.1.patch, YARN-2853.2.patch, YARN-2853.3.patch When killing an app, app first moves to KILLING state, If RMAppAttempt receives the attempt_unregister event before attempt_kill event, it'll ignore the later attempt_kill event. Hence, RMApp won't be able to move to KILLED state and stays at KILLING state forever. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering
[ https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14212300#comment-14212300 ] Hudson commented on YARN-2853: -- SUCCESS: Integrated in Hadoop-Hdfs-trunk-Java8 #5 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk-Java8/5/]) YARN-2853. Fixed a bug in ResourceManager causing apps to hang when the user kill request races with ApplicationMaster finish. Contributed by Jian He. (vinodkv: rev 3651fe1b089851b38be351c00a9899817166bf3e) * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ApplicationMasterService.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRM.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/TestRMAppTransitions.java * hadoop-yarn-project/CHANGES.txt * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMAppImpl.java YARN-2853. Merging to branch-2.6 for hadoop-2.6.0-rc1. (acmurthy: rev d648e60ebab7f1942dba92e9cd2cb62b8d70419b) * hadoop-yarn-project/CHANGES.txt Killing app may hang while AM is unregistering -- Key: YARN-2853 URL: https://issues.apache.org/jira/browse/YARN-2853 Project: Hadoop YARN Issue Type: Bug Reporter: Jian He Assignee: Jian He Fix For: 2.6.0 Attachments: YARN-2853.1.patch, YARN-2853.1.patch, YARN-2853.2.patch, YARN-2853.3.patch When killing an app, app first moves to KILLING state, If RMAppAttempt receives the attempt_unregister event before attempt_kill event, it'll ignore the later attempt_kill event. Hence, RMApp won't be able to move to KILLED state and stays at KILLING state forever. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering
[ https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14212364#comment-14212364 ] Hudson commented on YARN-2853: -- FAILURE: Integrated in Hadoop-Mapreduce-trunk #1957 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1957/]) YARN-2853. Fixed a bug in ResourceManager causing apps to hang when the user kill request races with ApplicationMaster finish. Contributed by Jian He. (vinodkv: rev 3651fe1b089851b38be351c00a9899817166bf3e) * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ApplicationMasterService.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMAppImpl.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/TestRMAppTransitions.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRM.java * hadoop-yarn-project/CHANGES.txt YARN-2853. Merging to branch-2.6 for hadoop-2.6.0-rc1. (acmurthy: rev d648e60ebab7f1942dba92e9cd2cb62b8d70419b) * hadoop-yarn-project/CHANGES.txt Killing app may hang while AM is unregistering -- Key: YARN-2853 URL: https://issues.apache.org/jira/browse/YARN-2853 Project: Hadoop YARN Issue Type: Bug Reporter: Jian He Assignee: Jian He Fix For: 2.6.0 Attachments: YARN-2853.1.patch, YARN-2853.1.patch, YARN-2853.2.patch, YARN-2853.3.patch When killing an app, app first moves to KILLING state, If RMAppAttempt receives the attempt_unregister event before attempt_kill event, it'll ignore the later attempt_kill event. Hence, RMApp won't be able to move to KILLED state and stays at KILLING state forever. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering
[ https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14212389#comment-14212389 ] Hudson commented on YARN-2853: -- SUCCESS: Integrated in Hadoop-Mapreduce-trunk-Java8 #5 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/5/]) YARN-2853. Fixed a bug in ResourceManager causing apps to hang when the user kill request races with ApplicationMaster finish. Contributed by Jian He. (vinodkv: rev 3651fe1b089851b38be351c00a9899817166bf3e) * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMAppImpl.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRM.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ApplicationMasterService.java * hadoop-yarn-project/CHANGES.txt * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/TestRMAppTransitions.java YARN-2853. Merging to branch-2.6 for hadoop-2.6.0-rc1. (acmurthy: rev d648e60ebab7f1942dba92e9cd2cb62b8d70419b) * hadoop-yarn-project/CHANGES.txt Killing app may hang while AM is unregistering -- Key: YARN-2853 URL: https://issues.apache.org/jira/browse/YARN-2853 Project: Hadoop YARN Issue Type: Bug Reporter: Jian He Assignee: Jian He Fix For: 2.6.0 Attachments: YARN-2853.1.patch, YARN-2853.1.patch, YARN-2853.2.patch, YARN-2853.3.patch When killing an app, app first moves to KILLING state, If RMAppAttempt receives the attempt_unregister event before attempt_kill event, it'll ignore the later attempt_kill event. Hence, RMApp won't be able to move to KILLED state and stays at KILLING state forever. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering
[ https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14210101#comment-14210101 ] Hudson commented on YARN-2853: -- FAILURE: Integrated in Hadoop-trunk-Commit #6535 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/6535/]) YARN-2853. Merging to branch-2.6 for hadoop-2.6.0-rc1. (acmurthy: rev d648e60ebab7f1942dba92e9cd2cb62b8d70419b) * hadoop-yarn-project/CHANGES.txt Killing app may hang while AM is unregistering -- Key: YARN-2853 URL: https://issues.apache.org/jira/browse/YARN-2853 Project: Hadoop YARN Issue Type: Bug Reporter: Jian He Assignee: Jian He Fix For: 2.7.0 Attachments: YARN-2853.1.patch, YARN-2853.1.patch, YARN-2853.2.patch, YARN-2853.3.patch When killing an app, app first moves to KILLING state, If RMAppAttempt receives the attempt_unregister event before attempt_kill event, it'll ignore the later attempt_kill event. Hence, RMApp won't be able to move to KILLED state and stays at KILLING state forever. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering
[ https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14210143#comment-14210143 ] Arun C Murthy commented on YARN-2853: - I've merged this back into branch-2.6 for hadoop-2.6.0-rc1. Killing app may hang while AM is unregistering -- Key: YARN-2853 URL: https://issues.apache.org/jira/browse/YARN-2853 Project: Hadoop YARN Issue Type: Bug Reporter: Jian He Assignee: Jian He Fix For: 2.6.0 Attachments: YARN-2853.1.patch, YARN-2853.1.patch, YARN-2853.2.patch, YARN-2853.3.patch When killing an app, app first moves to KILLING state, If RMAppAttempt receives the attempt_unregister event before attempt_kill event, it'll ignore the later attempt_kill event. Hence, RMApp won't be able to move to KILLED state and stays at KILLING state forever. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering
[ https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14208789#comment-14208789 ] Jian He commented on YARN-2853: --- bq. This is not correct. If app accept kill signal from the user, we should not continue running the app. right, updated the patch to kill the app if this is not the last attempt. if the failed attempt is the last attempt, the app state remains failed. Killing app may hang while AM is unregistering -- Key: YARN-2853 URL: https://issues.apache.org/jira/browse/YARN-2853 Project: Hadoop YARN Issue Type: Bug Reporter: Jian He Assignee: Jian He Attachments: YARN-2853.1.patch, YARN-2853.1.patch, YARN-2853.2.patch When killing an app, app first moves to KILLING state, If RMAppAttempt receives the attempt_unregister event before attempt_kill event, it'll ignore the later attempt_kill event. Hence, RMApp won't be able to move to KILLED state and stays at KILLING state forever. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering
[
https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14208835#comment-14208835
]
Hadoop QA commented on YARN-2853:
-
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12681151/YARN-2853.2.patch
against trunk revision 782abbb.
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 2 new
or modified test files.
{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 test build failed in
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-YARN-Build/5829//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/5829//console
This message is automatically generated.
Killing app may hang while AM is unregistering
--
Key: YARN-2853
URL: https://issues.apache.org/jira/browse/YARN-2853
Project: Hadoop YARN
Issue Type: Bug
Reporter: Jian He
Assignee: Jian He
Attachments: YARN-2853.1.patch, YARN-2853.1.patch, YARN-2853.2.patch
When killing an app, app first moves to KILLING state, If RMAppAttempt
receives the attempt_unregister event before attempt_kill event, it'll
ignore the later attempt_kill event. Hence, RMApp won't be able to move to
KILLED state and stays at KILLING state forever.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering
[ https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14208881#comment-14208881 ] Vinod Kumar Vavilapalli commented on YARN-2853: --- This looks good. One minor typo: unregisteres successfully. Killing app may hang while AM is unregistering -- Key: YARN-2853 URL: https://issues.apache.org/jira/browse/YARN-2853 Project: Hadoop YARN Issue Type: Bug Reporter: Jian He Assignee: Jian He Attachments: YARN-2853.1.patch, YARN-2853.1.patch, YARN-2853.2.patch When killing an app, app first moves to KILLING state, If RMAppAttempt receives the attempt_unregister event before attempt_kill event, it'll ignore the later attempt_kill event. Hence, RMApp won't be able to move to KILLED state and stays at KILLING state forever. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering
[ https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14208897#comment-14208897 ] Jian He commented on YARN-2853: --- fixed the typo, re-kick jenkins Killing app may hang while AM is unregistering -- Key: YARN-2853 URL: https://issues.apache.org/jira/browse/YARN-2853 Project: Hadoop YARN Issue Type: Bug Reporter: Jian He Assignee: Jian He Attachments: YARN-2853.1.patch, YARN-2853.1.patch, YARN-2853.2.patch, YARN-2853.3.patch When killing an app, app first moves to KILLING state, If RMAppAttempt receives the attempt_unregister event before attempt_kill event, it'll ignore the later attempt_kill event. Hence, RMApp won't be able to move to KILLED state and stays at KILLING state forever. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering
[ https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14207292#comment-14207292 ] Jian He commented on YARN-2853: --- Instead, we could get rid of the killing state completely and let app stay at the original state and change RMApp to handle attempt_killed state at each possible state. this way, we could avoid race condition like this. I'll file a separate jira to do this. Killing app may hang while AM is unregistering -- Key: YARN-2853 URL: https://issues.apache.org/jira/browse/YARN-2853 Project: Hadoop YARN Issue Type: Bug Reporter: Jian He Assignee: Jian He Attachments: YARN-2853.1.patch When killing an app, app first moves to KILLING state, If RMAppAttempt receives the attempt_unregister event before attempt_kill event, it'll ignore the later attempt_kill event. Hence, RMApp won't be able to move to KILLED state and stays at KILLING state forever. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering
[
https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14207303#comment-14207303
]
Hadoop QA commented on YARN-2853:
-
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12680930/YARN-2853.1.patch
against trunk revision 163bb55.
{color:red}-1 patch{color}. Trunk compilation may be broken.
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/5820//console
This message is automatically generated.
Killing app may hang while AM is unregistering
--
Key: YARN-2853
URL: https://issues.apache.org/jira/browse/YARN-2853
Project: Hadoop YARN
Issue Type: Bug
Reporter: Jian He
Assignee: Jian He
Attachments: YARN-2853.1.patch
When killing an app, app first moves to KILLING state, If RMAppAttempt
receives the attempt_unregister event before attempt_kill event, it'll
ignore the later attempt_kill event. Hence, RMApp won't be able to move to
KILLED state and stays at KILLING state forever.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering
[
https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14207486#comment-14207486
]
Hadoop QA commented on YARN-2853:
-
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12680948/YARN-2853.1.patch
against trunk revision 163bb55.
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 2 new
or modified test files.
{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 following test timeouts occurred in
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager:
org.apache.hadoop.yarn.server.resourcemanager.ahs.TestRMApplicationHistoryWriter
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-YARN-Build/5821//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/5821//console
This message is automatically generated.
Killing app may hang while AM is unregistering
--
Key: YARN-2853
URL: https://issues.apache.org/jira/browse/YARN-2853
Project: Hadoop YARN
Issue Type: Bug
Reporter: Jian He
Assignee: Jian He
Attachments: YARN-2853.1.patch, YARN-2853.1.patch
When killing an app, app first moves to KILLING state, If RMAppAttempt
receives the attempt_unregister event before attempt_kill event, it'll
ignore the later attempt_kill event. Hence, RMApp won't be able to move to
KILLED state and stays at KILLING state forever.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
