Hi Stack,
    Thank you very much for your explaination.
    We just adjusted the value of the property "zookeeper.session.timeout"
to 120000, and we are observing the system now.
    "Are nodes running on same nodes as hbase? " --Do you mean we should
have several servers running exclusively for zk cluster? But I'm afraid that
we can not have that many servers. Any suggestion?
    We don't config the zk in zoo.cfg, but in hbase-site.xml. Following is
the content in hbase-site.xml about zk.
    <property>
      <name>hbase.zookeeper.property.clientPort</name>
      <value>2222</value>
    </property>

    <property>
      <name>hbase.zookeeper.quorum</name>
      <value>ubuntu2,ubuntu3,ubuntu7,ubuntu9,ubuntu6</value>
    </property>
    <property>
      <name>zookeeper.session.timeout</name>
      <value>120000</value>
    </property>

    Thanks a lot,
    LvZheng

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