Hbase master not able to start

Question

I am trying to start hbase master but getting the below error:

Could not start ZK at requested port of 2181.  ZK was started at port: 2182.  Aborting as clients (e.g. shell) will not be able to find this ZK quorum.
13/07/14 06:33:23 ERROR master.HMasterCommandLine: Failed to start master
java.io.IOException: Could not start ZK at requested port of 2181.  ZK was started at port: 2182.  Aborting as clients (e.g. shell) will not be able to find this ZK quorum.
    at org.apache.hadoop.hbase.master.HMasterCommandLine.startMaster(HMasterCommandLine.java:134)
    at org.apache.hadoop.hbase.master.HMasterCommandLine.run(HMasterCommandLine.java:103)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
    at org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandLine.java:76)
    at org.apache.hadoop.hbase.master.HMaster.main(HMaster.java:1684)
13/07/14 06:33:23 INFO server.NIOServerCnxn: Closed socket connection for client /127.0.0.1:46283 (no session established for client)

hbase-site.xml

<configuration> 
  <!-- Changing the default port for REST since it conflicts with yarn nodemanager --> 
  <property> 
    <name>hbase.rest.port</name> 
    <value>8070</value> 
    <description>The port for the HBase REST server.</description> 
  </property> 
  <property> 
    <name>hbase.rootdir</name> 
    <value>hdfs://localhost:8020/hbase</value> 
  </property> 
</configuration>

Answer 1

It seems like something else is already using port 2181, or perhaps you had started another ZK instance earlier on this port. Either stop that processe or change its port. If that's is not possible then set hbase.zookeeper.property.clientPort to 2182 in hbase-site.xml.

Please note that HBase needs ZK's services, even in standalone mode, so you should make sure that it's running OK.

HTH