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Date: Mon, 23 Jan 2017 13:57:26 +0000 (UTC)
From: "Lantao Jin (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13037050.1485179831000.79608.1485179846611@Atlassian.JIRA>
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Subject: [jira] [Created] (HDFS-11360) HDFS balancer need to appoint to a
 decided nameservice
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archived-at: Mon, 23 Jan 2017 13:58:04 -0000

Lantao Jin created HDFS-11360:
---------------------------------

             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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