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https://issues.apache.org/jira/browse/YARN-3152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14310921#comment-14310921
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Xuan Gong commented on YARN-3152:
---------------------------------
bq. NodesListManager.refreshNodes should be same as
NodesListManager.serviceInit where in they handle gracefully if the configured
paths for exclude/include doesn't exist.
NodesListManager.refreshNodes is using the same way as
NodesListManager.serviceInit.
{code}
NodeListManager.serviceInit:
HostsFileReader hostsReader =
new HostsFileReader(includesFile,
(includesFile == null || includesFile.isEmpty()) ? null
: this.rmContext.getConfigurationProvider()
.getConfigurationInputStream(this.conf, includesFile),
excludesFile,
(excludesFile == null || excludesFile.isEmpty()) ? null
: this.rmContext.getConfigurationProvider()
.getConfigurationInputStream(this.conf, excludesFile));
{code}
If the file does not exist, both of them will throw out the exception. No ?
I understand what you consider. But I think that the earlier we found the issue
(In our case, maybe hard to debug why the exclude nodes are not considered even
we provides the exclude-node-list ), the better. So, we throw out such
exception when active RM starts
> 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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