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From "Matt Foley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMBARI-14453) Ambari has lowercase hostnames while cluster is installed with uppercase hostnames.
Date Wed, 06 Jan 2016 20:30:39 GMT

    [ https://issues.apache.org/jira/browse/AMBARI-14453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15086229#comment-15086229
] 

Matt Foley commented on AMBARI-14453:
-------------------------------------

[~lakshmivs], please clarify why you believe the java.net.ConnectException is due to uppercase/lowercase
issues?  It is our understanding that on all Linux (including SUSE) and WIndows, hostname
resolution is case-insensitive.  Hosts generally retain and present the mixed-case form of
their own names for human readability, but hostname matching for DNS purposes is done case-insensitive.
 Anyway by the time you get to "connection refused", you're working with IP addresses already.

You may instead have a configuration issue, perhaps due to incomplete configuration for multi-homing.

> Ambari has lowercase hostnames while cluster is installed with uppercase hostnames.
> -----------------------------------------------------------------------------------
>
>                 Key: AMBARI-14453
>                 URL: https://issues.apache.org/jira/browse/AMBARI-14453
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-server
>    Affects Versions: 2.2.0
>            Reporter: Lakshmi VS
>            Assignee: Dmitry Lysnichenko
>             Fix For: 2.2.1
>
>         Attachments: Ambari.JPG, hbase-hbase-master-N9-1-1.log, yarn-yarn-resourcemanager-N9-1-1.log
>
>
> Steps followed -
> 1. Hadoop cluster with below config is installed successfully with uppercase hostnames.
> {code}
> CLUSTERNAME='N91'
> MASTER1=N9-1-1.labs
> MASTER2=N9-1-2.labs
> DATANODE1=N9-1-3.labs
> DATANODE2=N9-1-4.labs
> DATANODE3=N9-1-5.labs
> {code}
> Snippet of /etc/hosts file -
> {code}
> 10.0.8.1    N9-1-1.labs N9-1-1 byn001-1 hadoopvm1-1
> 10.0.8.2    N9-1-2.labs N9-1-2 byn001-2 hadoopvm1-2
> 10.0.8.3    N9-1-3.labs N9-1-3 byn001-3 hadoopvm1-3
> 10.0.8.4    N9-1-4.labs N9-1-4 byn001-4 hadoopvm1-4
> 10.0.8.5    N9-1-5.labs N9-1-5 byn001-5 hadoopvm1-5
> {code}
> 2. Ambari host page shows all hostnames to be of lower case.
> 3. Attempt to run jobs fails on -
> {code}
> Error: java.net.ConnectException: Call From N9-1-4.labs/10.0.8.4 to n9-1-1.labs:8020
failed on connection exception: java.net.ConnectException: Connection refused;
> {code}
> Snippet of mapreduce job failure -
> {code}
> out: 15/12/21 08:12:09 INFO mapreduce.Job: Task Id : attempt_1450702943449_0001_m_000002_0,
Status : FAILED
>  out: Error: java.net.ConnectException: Call From N9-1-4.labs/10.0.8.4 to n9-1-1.labs:8020
failed on connection exception: java.net.ConnectException: Connection refused; For more details
see:  http://wiki.apache.org/hadoop/ConnectionRefused
>  out: 	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
>  out: 	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
>  out: 	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
>  out: 	at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
>  out: 	at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:792)
>  	at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:732)
>  	at org.apache.hadoop.ipc.Client.call(Client.java:1431)
> 	at org.apache.hadoop.ipc.Client.call(Client.java:1358)
>  	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229)
>  	at com.sun.proxy.$Proxy13.getFileInfo(Unknown Source)
>  	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:771)
>  	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>  	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>  	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>  	at java.lang.reflect.Method.invoke(Method.java:497)
>  	at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:252)
>  	at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:104)
>  	at com.sun.proxy.$Proxy14.getFileInfo(Unknown Source)
>  	at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:2116)
>  	at org.apache.hadoop.hdfs.DistributedFileSystem$22.doCall(DistributedFileSystem.java:1315)
>  	at org.apache.hadoop.hdfs.DistributedFileSystem$22.doCall(DistributedFileSystem.java:1311)
>  	at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
>  	at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1311)
>  	at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1424)
>  	at org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter.needsTaskCommit(FileOutputCommitter.java:641)
>  	at org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter.needsTaskCommit(FileOutputCommitter.java:630)
>  	at org.apache.hadoop.mapred.Task.isCommitRequired(Task.java:1085)
>  	at org.apache.hadoop.mapred.Task.done(Task.java:1042)
>  	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:345)
>  	at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:168)
>  	at java.security.AccessController.doPrivileged(Native Method)
>  	at javax.security.auth.Subject.doAs(Subject.java:422)
>  	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
>  	at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:162)
>  Caused by: java.net.ConnectException: Connection refused
>  	at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
>  	at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
>  	at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
>  	at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:531)
>  	at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:495)
>  	at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:612)
>  	at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:710)
>  	at org.apache.hadoop.ipc.Client$Connection.access$2800(Client.java:373)
>  	at org.apache.hadoop.ipc.Client.getConnection(Client.java:1493)
> 	at org.apache.hadoop.ipc.Client.call(Client.java:1397)
> 	... 27 more
> {code}
> 3. Services - HDFS, Mapreduce, HBase, Yarn services which were up and running after installation
go down.
> Attached are the logs for Yarn and HBase services.



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