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https://issues.apache.org/jira/browse/AMBARI-5840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Hurley updated AMBARI-5840:
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Description:
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.server.com:8020</value>
</property>
the active namenode host would be master02.server.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.
was:
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.
> 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.server.com:8020</value>
> </property>
> the active namenode host would be master02.server.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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