Hbase Regions服务器无法与HMaster通信

Question

我无法在分布式模式下设置hbase。当我在一台机器上设置它时，它工作得很好(独立模式)。我的Zookeeper、hmaster和region服务器启动正常。

但是当我访问hbase shell并查看状态时。它向我显示了0区域服务器。我附上了我的地区服务器的日志。加上我的主节点(Namenode)和从节点(Datanode)的主机文件。我已经尝试了stackoverflow上给出的每一个改变主机文件的P&C，但对我都不起作用。

       2013-06-24 15:03:45,844 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server naresh-pc/192.168.0.108:2181. Will not attempt to authenticate using SASL (unknown error)
            2013-06-24 15:03:45,845 WARN org.apache.zookeeper.ClientCnxn: Session 0x13f75807d960001 for server null, unexpected error, closing socket connection and attempting to reconnect

            java.net.ConnectException: Connection refused
                    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
                    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:692)
                    at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350)
                    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1068)

     Slave /etc/hosts :

    127.0.0.1       localhost
    127.0.1.1       ubuntu-pc
    #ip for hadoop
    192.168.0.108   master
    192.168.0.126   slave

    # The following lines are desirable for IPv6 capable hosts
    ::1     ip6-localhost ip6-loopback
    fe00::0 ip6-localnet
    ff00::0 ip6-mcastprefix
    ff02::1 ip6-allnodes
    ff02::2 ip6-allrouters

    Master /etc/hosts :

    127.0.0.1       localhost
    127.0.1.1       naresh-pc
   #ip for hadoop 
    192.168.0.108   master
    192.168.0.126   slave


    # The following lines are desirable for IPv6 capable hosts
    ::1     ip6-localhost ip6-loopback
    fe00::0 ip6-localnet
    ff00::0 ip6-mcastprefix
    ff02::1 ip6-allnodes
    ff02::2 ip6-allrouters

hbase-site.xml：

  <configuration>  
 <property>
    <name>hbase.master</name>
           <value>master:60000</value>
          <description>The host and port that the HBase master runs at.
                    A value of 'local' runs the master and a regionserver
                                                     in a single process.
                               </description>
                </property>

                <property>
                                <name>hbase.rootdir</name>
                                <value>hdfs://master:54310/hbase</value>
                                <description>The directory shared by region servers.</description>
                </property>


<property>
                                <name>hbase.cluster.distributed</name>
                                <value>true</value>
                                <description>The mode the cluster will be in. Possible values are
                                false: standalone and pseudo-distributed setups with managed
                                Zookeeper true: fully-distributed with unmanaged Zookeeper
                                Quorum (see hbase-env.sh)
                                </description>
                </property>
                <property>
                                <name>hbase.zookeeper.property.clientPort</name>
                                <value>2181</value>
                                <description>Property from ZooKeeper's config zoo.cfg.
                                The port at which the clients will connect.
                                </description>
                </property>

                <property>
           <name>hbase.zookeeper.quorum</name>
             <value>master</value>
                <description>Comma separated list of servers in the ZooKeeper Quorum.
                                     For example,
                                     "host1.mydomain.com,host2.mydomain.com".
                                     By default this is set to localhost for local and
                                     pseudo-distributed modes of operation. For a
                                     fully-distributed setup, this should be set to a full
                                     list of ZooKeeper quorum servers. If
                                     HBASE_MANAGES_ZK is set in hbase-env.sh
                                     this is the list of servers which we will start/stop
                                     ZooKeeper on.
                </description>
                </property>
</configuration>

    Zookeeper log:

         2013-06-28 18:22:26,781 WARN org.apache.zookeeper.server.NIOServerCnxn: caught end of stream exception
    EndOfStreamException: Unable to read additional data from client sessionid 0x13f8ac0b91b0002, likely client has closed socket
        at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:220)
        at org.apache.zookeeper.server.NIOServerCnxnFactory.run(NIOServerCnxnFactory.java:208)
        at java.lang.Thread.run(Thread.java:722)
    2013-06-28 18:22:26,858 INFO org.apache.zookeeper.server.NIOServerCnxn: Closed socket connection for client /192.168.0.108:57447 which had sessionid 0x13f8ac0b91b0002
    2013-06-28 18:25:21,001 INFO org.apache.zookeeper.server.ZooKeeperServer: Expiring session 0x13f8ac0b91b0002, timeout of 180000ms exceeded
    2013-06-28 18:25:21,002 INFO org.apache.zookeeper.server.PrepRequestProcessor: Processed session termination for sessionid: 0x13f8ac0b91b0002      

Master Log:
2013-06-28 18:22:41,932 INFO org.apache.hadoop.hbase.master.ServerManager: Waiting for region servers count to settle; currently checked in 0, slept for 1502022 ms
2013-06-28 18:22:43,457 INFO org.apache.hadoop.hbase.master.ServerManager: Waiting for region servers count to settle; currently checked in 0, slept for 1503547 ms

Answer 1

从主机文件中删除127.0.1.1并打开IPV6。这应该可以解决这个问题。

Answer 2

您的Regionserver正在naresh-pc上查找主机，但是您的/etc/ HMaster文件中没有这样的条目。请确保您的配置正确。

Answer 3

你能尝试所有这些吗：

确保您的/conf/regionservers文件只有一个条目：slave

不确定您使用的是哪个HBase版本，而不是为hbase-site.xml中的hbase.rootdir属性使用端口54310，而是使用端口9000

您的/etc/hosts文件在主服务器和从服务器上都应该只有以下自定义条目：

127.0.0.1本地主机

192.168.0.108主

192.168.0.126从

我担心您的日志显示为Opening socket connection to server naresh-pc/192.168.0.108:2181

显然，系统认为zookeeper在主机naresh-pc上，但在您的配置中，您在主机master上设置了zookeeper quorum，HBase将绑定到该主机。这就是一个问题。根据我的经验，HBase对主机名非常挑剔，所以要确保它们在所有配置和/etc/hosts文件中都是同步的。

此外，这可能是一个小问题，但在.xml文件中指定zookeper数据目录以具有使集群工作的最小设置集也无伤大雅：hbase.zookeeper.property.dataDir