Jianfei Jiang created HDFS-12935:
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Summary: 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-beta1
Reporter: Jianfei Jiang
Fix For: 3.0.0-beta1
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). 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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