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Posted to yarn-issues@hadoop.apache.org by "Xuan Gong (JIRA)" <ji...@apache.org> on 2015/02/07 03:50:35 UTC
[jira] [Commented] (YARN-3152) Missing hadoop exclude file fails
RMs in HA
[ https://issues.apache.org/jira/browse/YARN-3152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14310487#comment-14310487 ]
Xuan Gong commented on YARN-3152:
---------------------------------
In the yarn-site.xml, we do set some value for the yarn.resourcemanager.nodes.exclude-path. Since the file does not exist, we should throw out the exception. When RM starts to transit to active, it automatically calls all the refresh*s. It is by design if any of them fails, we should let RM fail.
> Missing hadoop exclude file fails RMs in HA
> -------------------------------------------
>
> Key: YARN-3152
> URL: https://issues.apache.org/jira/browse/YARN-3152
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.6.0
> Environment: Debian 7
> Reporter: Neill Lima
> Assignee: Naganarasimha G R
>
> NI have two NNs in HA, they do not fail when the exclude file is not present (hadoop-2.6.0/etc/hadoop/exclude). I had one RM and I wanted to make two in HA. I didn't create the exclude file at this point as well. I applied the HA RM settings properly and when I started both RMs I started getting this exception:
> 2015-02-06 12:25:25,326 WARN org.apache.hadoop.yarn.server.resourcemanager.RMAuditLogger: USER=root OPERATION=transitionToActive TARGET=RMHAProtocolService RESULT=FAILURE DESCRIPTION=Exception transitioning to active PERMISSIONS=All users are allowed
> 2015-02-06 12:25:25,326 WARN org.apache.hadoop.ha.ActiveStandbyElector: Exception handling the winning of election
> org.apache.hadoop.ha.ServiceFailedException: RM could not transition to Active
> at org.apache.hadoop.yarn.server.resourcemanager.EmbeddedElectorService.becomeActive(EmbeddedElectorService.java:128)
> at org.apache.hadoop.ha.ActiveStandbyElector.becomeActive(ActiveStandbyElector.java:805)
> at org.apache.hadoop.ha.ActiveStandbyElector.processResult(ActiveStandbyElector.java:416)
> at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:599)
> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:498)
> Caused by: org.apache.hadoop.ha.ServiceFailedException: Error when transitioning to Active mode
> at org.apache.hadoop.yarn.server.resourcemanager.AdminService.transitionToActive(AdminService.java:304)
> at org.apache.hadoop.yarn.server.resourcemanager.EmbeddedElectorService.becomeActive(EmbeddedElectorService.java:126)
> ... 4 more
> Caused by: org.apache.hadoop.ha.ServiceFailedException: java.io.FileNotFoundException: /hadoop-2.6.0/etc/hadoop/exclude (No such file or directory)
> at org.apache.hadoop.yarn.server.resourcemanager.AdminService.refreshAll(AdminService.java:626)
> at org.apache.hadoop.yarn.server.resourcemanager.AdminService.transitionToActive(AdminService.java:297)
> ... 5 more
> 2015-02-06 12:25:25,327 INFO org.apache.hadoop.ha.ActiveStandbyElector: Trying to re-establish ZK session
> 2015-02-06 12:25:25,339 INFO org.apache.zookeeper.ZooKeeper: Session: 0x44af32566180094 closed
> 2015-02-06 12:25:26,340 INFO org.apache.zookeeper.ZooKeeper: Initiating client connection, connectString=x.x.x.x:2181,x.x.x.x:2181 sessionTimeout=10000 watcher=org.apache.hadoop.ha.ActiveStandbyElector$WatcherWithClientRef@307587c
> 2015-02-06 12:25:26,341 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server x.x.x.x/x.x.x.x:2181. Will not attempt to authenticate using SASL (unknown error)
> 2015-02-06 12:25:26,341 INFO org.apache.zookeeper.ClientCnxn: Socket connection established to x.x.x.x/x.x.x.x:2181, initiating session
> The issue is descriptive enough to resolve the problem - and it has been fixed by creating the exclude file.
> I just think as of a improvement:
> - Should RMs ignore the missing file as the NNs did?
> - Should single RM fail even when the file is not present?
> Just suggesting this improvement to keep the behavior consistent when working with in HA (both NNs and RMs).
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