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https://issues.apache.org/jira/browse/HDFS-12935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jianfei Jiang updated HDFS-12935:
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Status: In Progress (was: Patch Available)
> Get ambiguous result for DFSAdmin command in HA mode when only one namenode
> is up
> ---------------------------------------------------------------------------------
>
> Key: HDFS-12935
> URL: https://issues.apache.org/jira/browse/HDFS-12935
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: tools
> Affects Versions: 3.0.0, 3.0.0-beta1
> Reporter: Jianfei Jiang
> Assignee: Jianfei Jiang
> Attachments: HDFS-12935.002.patch, HDFS-12935.003.patch,
> HDFS-12935.004.patch, HDFS-12935.005.patch, HDFS_12935.001.patch
>
>
> In HA mode, if one namenode is down, most of functions can still work. When
> considering the following two occasions:
> (1)nn1 up and nn2 down
> (2)nn1 down and nn2 up
> These two occasions should be equivalent. However, some of the DFSAdmin
> commands will have ambiguous results. The commands can be send successfully
> to the up namenode and are always functionally useful only when nn1 is up
> regardless of exception (IOException when connecting to the down namenode
> nn2). If only nn2 is up, the commands have no use at all and only exception
> to connect nn1 can be found.
> See the following command "hdfs dfsadmin setBalancerBandwidth" which aim to
> set balancer bandwidth value for datanodes as an example. It works and all
> the datanodes can get the setting values only when nn1 is up. If only nn2 is
> up, the command throws exception directly and no datanode get the bandwidth
> setting. Approximately ten DFSAdmin commands use the similar logical process
> and may be ambiguous.
> [root@jiangjianfei01 ~]# hdfs haadmin -getServiceState nn1
> active
> [root@jiangjianfei01 ~]# hdfs dfsadmin -setBalancerBandwidth 12345
> *Balancer bandwidth is set to 12345 for jiangjianfei01/172.17.0.14:9820*
> setBalancerBandwidth: Call From jiangjianfei01/172.17.0.14 to
> jiangjianfei02:9820 failed on connection exception:
> java.net.ConnectException: Connection refused; For more details see:
> http://wiki.apache.org/hadoop/ConnectionRefused
> [root@jiangjianfei01 ~]# hdfs haadmin -getServiceState nn2
> active
> [root@jiangjianfei01 ~]# hdfs dfsadmin -setBalancerBandwidth 1234
> setBalancerBandwidth: Call From jiangjianfei01/172.17.0.14 to
> jiangjianfei01:9820 failed on connection exception:
> java.net.ConnectException: Connection refused; For more details see:
> http://wiki.apache.org/hadoop/ConnectionRefused
> [root@jiangjianfei01 ~]#
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