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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