[HDFS-2918] HA: Update HA docs to cover dfsadmin

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.0.0-alpha
• Component/s: ha
• Assignee: Unassigned
• Reporter: Eli Collins
• Created: 08/Feb/12 23:13
• Updated: 10/Mar/15 04:36

Description

dfsadmin currently always uses the first namenode rather than failing over. It should failover like other clients, unless fs specifies a specific namenode.

hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs haadmin -failover nn1 nn2
Failover from nn1 to nn2 successful
# nn2 is 8022
hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs dfsadmin -fs localhost:8022 -safemode enter
Safe mode is ON
hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs dfsadmin -safemode get 
Safe mode is OFF
hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs dfsadmin -fs localhost:8022 -safemode get
Safe mode is ON