[AMBARI-17951] Introduce validation of hostgroup mapping for active/standby namenode

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: trunk
• Fix Version/s: trunk
• Component/s: ambari-server, blueprints
• Assignee: Amruta Borkar
• Reporter: Amruta Borkar
• Created: 29/Jul/16 02:05
• Updated: 10/Aug/16 22:21
• Resolved: 10/Aug/16 17:44

Description

Ambari allows user to specify following properties when Namenode HA is enabled, but does not validate for correct mapping.

"dfs_ha_initial_namenode_active" : "hostname or hostgroup reference",
"dfs_ha_initial_namenode_standby" : "hostname or hostgroup reference”

If the values for above properties are mentioned incorrectly following exception is thrown and NAMENODE fails to start.

2016-07-27 18:54:43,522 WARN namenode.FSNamesystem (FSNamesystem.java:loadFromDisk(692)) - Encountered exception loading fsimage
java.io.IOException: NameNode is not formatted.
at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:225)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:1015)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:690)
at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:688)
at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:752)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:992)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:976)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1686)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1754)

Issue Links

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