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From "Vincent Sheffer (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5677) Need error checking for HA cluster configuration
Date Wed, 18 Dec 2013 00:59:07 GMT
Vincent Sheffer created HDFS-5677:

             Summary: Need error checking for HA cluster configuration
                 Key: HDFS-5677
                 URL: https://issues.apache.org/jira/browse/HDFS-5677
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode, ha
    Affects Versions: 2.0.6-alpha
         Environment: centos6.5, oracle jdk6 45, 
            Reporter: Vincent Sheffer
            Priority: Minor

If a node is declared in the *dfs.ha.namenodes.myCluster* but is _not_ later defined in subsequent
dfs.namenode.servicerpc-address.myCluster.nodename or dfs.namenode.rpc-address.myCluster.XXX
properties no error or warning message is provided to indicate that.

The only indication of a problem is a log message like the following:

WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Problem connecting to server: myCluster:8020

Another way to look at this is that no error or warning is provided when a servicerpc-address/rpc-address
property is defined for a node without a corresponding node declared in *dfs.ha.namenodes.myCluster*.

This arose when I had a typo in the *dfs.ha.namenodes.myCluster* property for one of my node
names.  It would be very helpful to have at least a warning message on startup if there is
a configuration problem like this.

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