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From "Neill Lima (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-11555) Missing hadoop exclude file fails RMs in HA
Date Fri, 06 Feb 2015 13:18:34 GMT
Neill Lima created HADOOP-11555:
-----------------------------------

             Summary: Missing hadoop exclude file fails RMs in HA
                 Key: HADOOP-11555
                 URL: https://issues.apache.org/jira/browse/HADOOP-11555
             Project: Hadoop Common
          Issue Type: Bug
          Components: ha
    Affects Versions: 2.6.0
         Environment: Debian 7
            Reporter: Neill Lima


I 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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