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MapReduce >> mail # user >> About connection to NameNode in NameNode-HA


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About connection to NameNode in NameNode-HA
Hi,

I write hdfs-site.xml of all nodes as follows in NameNode-HA.

----------
... snip  ...
  <property>
    <name>dfs.namenode.rpc-address.ns.nn1</name>
    <value>nn1:8020</value>
  </property>
 <property>
    <name>dfs.namenode.rpc-address.ns.nn2</name>
    <value>nn2:8020</value>
 </property>
 <property>
    <name>dfs.client.failover.proxy.provider.nn</name>
    <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
 </property>
... snip ...
----------
(nn : nameserviceID, nn1: NameNode1, nn2: NameNode2)

Is the order of connection from DFSClient to NameNode always "(1) nn1"
and "(2) nn2" ?
And will "StandbyException" messages be written in the log of nn1 If
the state of nn1 is standby?

Regards,
Shinichi
+
Todd Lipcon 2012-11-01, 16:43
+
Shinichi Yamashita 2012-11-04, 12:24