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From "Jonathan Hurley (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMBARI-5840) Ambari recomission of datanodes will not work if the active namenode is "nn2"
Date Wed, 21 May 2014 15:54:39 GMT
Jonathan Hurley created AMBARI-5840:
---------------------------------------

             Summary: Ambari recomission of datanodes will not  work if the active namenode
is "nn2"
                 Key: AMBARI-5840
                 URL: https://issues.apache.org/jira/browse/AMBARI-5840
             Project: Ambari
          Issue Type: Bug
          Components: agent
    Affects Versions: 1.5.1
         Environment: java 1.6 update 31
Centos 6.4
Not specific to Ambari, but ambari 1.5.1 this was reproduced.
            Reporter: Jonathan Hurley
            Assignee: Jonathan Hurley
            Priority: Critical
             Fix For: 1.6.1


PROBLEM: Ambari recomission of datanodes will not work if the active namenode is "nn2"
BUSINESS IMPACT: This will cause a node to not ever be recomissioned if the nn2 machine is
the active namenode. Basically, any change that requires a refreshnodes command, will not
be applied if nn2 is the active namenode.
STEPS TO REPRODUCE: 
1. Create a new cluster with HA for namenode
2. Decomission a datanode
3. Failover the namenode, so the node that corresponds to nn2 is the active namenode. 
for example in hdfs-site.xml: 
<property>
<name>dfs.namenode.rpc-address.cluster01.nn2</name>
<value>master02.manage.com:8020</value>
</property>
the active namenode host would be master02.manage.com. 
3. Now try to recomission the node. 
4. when the process is done as per ambari, execute a hdfs dfsadmin -report and grep for "Decommissioned".
You should see that machine you just try to recommission as decomissioned.
ACTUAL BEHAVIOR: The recomission process does not work in ambari if nn2 is the active namenode.
EXPECTED BEHAVIOR: The recomission process should work.
WORKAROUND: Use the command: 
hdfs dfsadmin -fs hdfs://<namenodehostactive>:8020 -refreshNodes
This will refreshnodes properly for the active namenode.



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