Lantao Jin created HDFS-11360:
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Summary: HDFS balancer need to appoint to a decided nameservice
Key: HDFS-11360
URL: https://issues.apache.org/jira/browse/HDFS-11360
Project: Hadoop HDFS
Issue Type: Bug
Components: balancer & mover
Reporter: Lantao Jin
Priority: Minor
With distcp configuration, there are two or more "nameservices" setting in
hdfs-site.xml, for example:
{code}
<property>
<name>dfs.nameservices</name>
<value>one-nn-ha,two--nn-ha</value>
</property>
{code}
If the HDFS Balancer also launches in that node, it will create two IPC threads
to connect both of NNs. And block removing also happens in the this Balancer.
Although I didn't find any block removing between different nodes, the behavior
still became weird and unexpected.
So the best way is adding a configuration that appoint to a decided nameservice
to launch. I can offer a patch. Any better ideal?
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