[HDFS-3507] DFS#isInSafeMode needs to execute only on Active NameNode

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.0.2-alpha
• Fix Version/s: 2.0.3-alpha
• Component/s: ha
• Target Version/s: 2.0.3-alpha
• Hadoop Flags: Reviewed
• Assignee: Vinayakumar B
• Reporter: Vinayakumar B
• Created: 05/Jun/12 13:03
• Updated: 12/Jun/14 09:03
• Resolved: 16/Nov/12 22:00

Description

Currently DFS#isInSafeMode is not Checking for the NN state. It can be executed on any of the NNs.

But HBase will use this API to check for the NN safemode before starting up its service.

If first NN configured is in standby then DFS#isInSafeMode will check standby NNs safemode but hbase want state of Active NN.

Issue Links

• relates to: HDFS-5147 Certain dfsadmin commands such as safemode do not interact with the active namenode in ha setup
• relates to: HBASE-7715 FSUtils#waitOnSafeMode can incorrectly loop on standby NN