title: Hbase HMaster not running
body: <p>I am getting some issues in HBase. When I try to start hadoop , it starts without any issue.but HBase not works.DataNode , HRegionServer , secondaryNameNode etc all are working but HMaster is not running, when I start hbase.Sometimes it throws an exception "RegionServer is running as process #xyz .stop it first.Another strange thing is HBase logs are printing "Matser started" but when we check , it is not start.I am searching out the issue , but unable to understand. Guide me if you get a clue.Here the logs of HBase given below</p>
  
  <pre><code>Wed Apr  4 17:48:46 PKT 2012 Starting master on hbase
  ulimit -n 1024
  2012-04-04 17:48:48,804 INFO org.apache.hadoop.hbase.ipc.HBaseRpcMetrics: Initializing RPC Metrics with hostName=HMaster, port=60000
  2012-04-04 17:48:49,185 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server Responder: starting
  2012-04-04 17:48:49,191 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server listener on 60000: starting
  2012-04-04 17:48:49,199 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 0 on 60000: starting
  2012-04-04 17:48:49,203 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 1 on 60000: starting
  2012-04-04 17:48:49,204 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 2 on 60000: starting
  2012-04-04 17:48:49,213 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 3 on 60000: starting
  2012-04-04 17:48:49,213 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 4 on 60000: starting
  2012-04-04 17:48:49,271 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 9 on 60000: starting
  2012-04-04 17:48:49,272 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 5 on 60000: starting
  2012-04-04 17:48:49,275 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 8 on 60000: starting
  2012-04-04 17:48:49,278 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 7 on 60000: starting
  2012-04-04 17:48:49,280 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 6 on 60000: starting
  2012-04-04 17:48:49,396 INFO org.apache.zookeeper.ZooKeeper: Client environment:zookeeper.version=3.3.2-1031432, built on 11/05/2010 05:32 GMT
  2012-04-04 17:48:49,400 INFO org.apache.zookeeper.ZooKeeper: Client environment:host.name=hbase.ifkaar.com
  2012-04-04 17:48:49,400 INFO org.apache.zookeeper.ZooKeeper: Client environment:java.version=1.6.0_20
  2012-04-04 17:48:49,400 INFO org.apache.zookeeper.ZooKeeper: Client environment:java.vendor=Sun Microsystems Inc.
  2012-04-04 17:48:49,400 INFO org.apache.zookeeper.ZooKeeper: Client environment:java.home=/usr/lib/jvm/java-6-openjdk/jre
  2012-04-04 17:48:49,400 INFO org.apache.zookeeper.ZooKeeper: Client environment:java.class.path=/opt/ifkaar/hbase-0.90.4/bin/../conf:/usr/lib/jvm/java-6-openjdk/lib/tools.jar:/opt/ifkaar/hbase-0.90.4/bin/..:/opt/ifkaar/hbase-0.90.4/bin/../hbase-0.90.4.jar:/opt/ifkaar/hbase-0.90.4/bin/../hbase-0.90.4-tests.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/activation-1.1.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/asm-3.1.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/avro-1.3.3.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/commons-cli-1.2.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/commons-codec-1.4.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/commons-configuration-1.6.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/commons-el-1.0.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/commons-httpclient-3.1.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/commons-lang-2.5.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/commons-logging-1.1.1.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/commons-net-1.4.1.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/core-3.1.1.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/guava-r06.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/hadoop-core-0.20.205.0.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/hadoop-gpl-compression-0.2.0-dev.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jackson-core-asl-1.5.5.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jackson-jaxrs-1.5.5.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jackson-mapper-asl-1.4.2.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jackson-xc-1.5.5.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jasper-compiler-5.5.23.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jasper-runtime-5.5.23.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jaxb-api-2.1.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jaxb-impl-2.1.12.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jersey-core-1.4.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jersey-json-1.4.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jersey-server-1.4.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jettison-1.1.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jetty-6.1.26.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jetty-util-6.1.26.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jruby-complete-1.6.0.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jsp-2.1-6.1.14.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jsp-api-2.1-6.1.14.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/jsr311-api-1.1.1.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/log4j-1.2.16.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/protobuf-java-2.3.0.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/servlet-api-2.5-6.1.14.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/slf4j-api-1.5.8.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/slf4j-log4j12-1.5.8.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/stax-api-1.0.1.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/thrift-0.2.0.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/xmlenc-0.52.jar:/opt/ifkaar/hbase-0.90.4/bin/../lib/zookeeper-3.3.2.jar
  2012-04-04 17:48:49,401 INFO org.apache.zookeeper.ZooKeeper: Client environment:java.library.path=/usr/lib/jvm/java-6-openjdk/jre/lib/i386/client:/usr/lib/jvm/java-6-openjdk/jre/lib/i386:/usr/lib/jvm/java-6-openjdk/jre/../lib/i386:/usr/java/packages/lib/i386:/usr/lib/jni:/lib:/usr/lib
  2012-04-04 17:48:49,401 INFO org.apache.zookeeper.ZooKeeper: Client environment:java.io.tmpdir=/tmp
  2012-04-04 17:48:49,401 INFO org.apache.zookeeper.ZooKeeper: Client environment:java.compiler=&lt;NA&gt;
  2012-04-04 17:48:49,401 INFO org.apache.zookeeper.ZooKeeper: Client environment:os.name=Linux
  2012-04-04 17:48:49,401 INFO org.apache.zookeeper.ZooKeeper: Client environment:os.arch=i386
  2012-04-04 17:48:49,401 INFO org.apache.zookeeper.ZooKeeper: Client environment:os.version=2.6.32-38-generic
  2012-04-04 17:48:49,401 INFO org.apache.zookeeper.ZooKeeper: Client environment:user.name=ifkaar
  2012-04-04 17:48:49,401 INFO org.apache.zookeeper.ZooKeeper: Client environment:user.home=/home/ifkaar
  2012-04-04 17:48:49,401 INFO org.apache.zookeeper.ZooKeeper: Client environment:user.dir=/opt/ifkaar/hbase-0.90.4/bin
  2012-04-04 17:48:49,403 INFO org.apache.zookeeper.ZooKeeper: Initiating client connection, connectString=localhost:2181 sessionTimeout=180000 watcher=master:60000
  2012-04-04 17:48:49,469 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server localhost/127.0.0.1:2181
  2012-04-04 17:48:49,506 INFO org.apache.zookeeper.ClientCnxn: Socket connection established to localhost/127.0.0.1:2181, initiating session
  2012-04-04 17:48:49,688 INFO org.apache.zookeeper.ClientCnxn: Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x1367d66702b0000, negotiated timeout = 180000
  2012-04-04 17:48:49,740 INFO org.apache.hadoop.metrics.jvm.JvmMetrics: Initializing JVM Metrics with processName=Master, sessionId=hbase.ifkaar.com:60000
  2012-04-04 17:48:49,784 INFO org.apache.hadoop.hbase.metrics: MetricsString added: revision
  2012-04-04 17:48:49,784 INFO org.apache.hadoop.hbase.metrics: MetricsString added: hdfsUser
  2012-04-04 17:48:49,784 INFO org.apache.hadoop.hbase.metrics: MetricsString added: hdfsDate
  2012-04-04 17:48:49,784 INFO org.apache.hadoop.hbase.metrics: MetricsString added: hdfsUrl
  2012-04-04 17:48:49,784 INFO org.apache.hadoop.hbase.metrics: MetricsString added: date
  2012-04-04 17:48:49,784 INFO org.apache.hadoop.hbase.metrics: MetricsString added: hdfsRevision
  2012-04-04 17:48:49,800 INFO org.apache.hadoop.hbase.metrics: MetricsString added: user
  2012-04-04 17:48:49,800 INFO org.apache.hadoop.hbase.metrics: MetricsString added: hdfsVersion
  2012-04-04 17:48:49,800 INFO org.apache.hadoop.hbase.metrics: MetricsString added: url
  2012-04-04 17:48:49,800 INFO org.apache.hadoop.hbase.metrics: MetricsString added: version
  2012-04-04 17:48:49,801 INFO org.apache.hadoop.hbase.metrics: new MBeanInfo
  2012-04-04 17:48:49,802 INFO org.apache.hadoop.hbase.metrics: new MBeanInfo
  2012-04-04 17:48:49,802 INFO org.apache.hadoop.hbase.master.metrics.MasterMetrics: Initialized
  2012-04-04 17:48:49,939 INFO org.apache.hadoop.hbase.master.ActiveMasterManager: Master=hbase.ifkaar.com:60000
  2012-04-04 17:48:52,204 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 0 time(s).
  2012-04-04 17:48:53,205 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 1 time(s).
  2012-04-04 17:48:54,206 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 2 time(s).
  2012-04-04 17:48:55,207 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 3 time(s).
  2012-04-04 17:48:56,207 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 4 time(s).
  2012-04-04 17:48:57,208 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 5 time(s).
  2012-04-04 17:48:58,209 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 6 time(s).
  2012-04-04 17:48:59,210 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 7 time(s).
  2012-04-04 17:49:00,211 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 8 time(s).
  2012-04-04 17:49:01,212 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 9 time(s).
  2012-04-04 17:49:01,216 FATAL org.apache.hadoop.hbase.master.HMaster: Unhandled exception. Starting shutdown.
  java.net.ConnectException: Call to localhost/127.0.0.1:54310 failed on connection exception: java.net.ConnectException: Connection refused
      at org.apache.hadoop.ipc.Client.wrapException(Client.java:1095)
      at org.apache.hadoop.ipc.Client.call(Client.java:1071)
      at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225)
      at $Proxy6.getProtocolVersion(Unknown Source)
      at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:396)
      at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:379)
      at org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:118)
      at org.apache.hadoop.hdfs.DFSClient.&lt;init&gt;(DFSClient.java:222)
      at org.apache.hadoop.hdfs.DFSClient.&lt;init&gt;(DFSClient.java:187)
      at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:89)
      at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1328)
      at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:65)
      at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1346)
      at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:244)
      at org.apache.hadoop.fs.Path.getFileSystem(Path.java:187)
      at org.apache.hadoop.hbase.util.FSUtils.getRootDir(FSUtils.java:364)
      at org.apache.hadoop.hbase.master.MasterFileSystem.&lt;init&gt;(MasterFileSystem.java:81)
      at org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:346)
      at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:282)
  Caused by: java.net.ConnectException: Connection refused
      at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
      at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:592)
      at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
      at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:604)
      at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:434)
      at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:560)
      at org.apache.hadoop.ipc.Client$Connection.access$2000(Client.java:184)
      at org.apache.hadoop.ipc.Client.getConnection(Client.java:1202)
      at org.apache.hadoop.ipc.Client.call(Client.java:1046)
      ... 17 more
  2012-04-04 17:49:01,221 INFO org.apache.hadoop.hbase.master.HMaster: Aborting
  2012-04-04 17:49:01,221 DEBUG org.apache.hadoop.hbase.master.HMaster: Stopping service threads
  2012-04-04 17:49:01,222 INFO org.apache.hadoop.ipc.HBaseServer: Stopping server on 60000
  2012-04-04 17:49:01,222 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 0 on 60000: exiting
  2012-04-04 17:49:01,222 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 1 on 60000: exiting
  2012-04-04 17:49:01,222 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 2 on 60000: exiting
  2012-04-04 17:49:01,223 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 3 on 60000: exiting
  2012-04-04 17:49:01,223 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 4 on 60000: exiting
  2012-04-04 17:49:01,223 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 5 on 60000: exiting
  2012-04-04 17:49:01,223 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 6 on 60000: exiting
  2012-04-04 17:49:01,223 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 7 on 60000: exiting
  2012-04-04 17:49:01,224 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 8 on 60000: exiting
  2012-04-04 17:49:01,224 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 9 on 60000: exiting
  2012-04-04 17:49:01,224 INFO org.apache.hadoop.ipc.HBaseServer: Stopping IPC Server listener on 60000
  2012-04-04 17:49:01,228 INFO org.apache.hadoop.ipc.HBaseServer: Stopping IPC Server Responder
  2012-04-04 17:49:01,300 INFO org.apache.zookeeper.ClientCnxn: EventThread shut down
  2012-04-04 17:49:01,301 INFO org.apache.zookeeper.ZooKeeper: Session: 0x1367d66702b0000 closed
  2012-04-04 17:49:01,301 INFO org.apache.hadoop.hbase.master.HMaster: HMaster main thread exiting
  Wed Apr  4 17:49:38 PKT 2012 Stopping hbase (via master)
  </code></pre>