[HDFS-762] Trying to start the balancer throws a NPE

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.21.0
• Fix Version/s: 0.21.0
• Hadoop Flags: Reviewed
• Assignee: Cristian Ivascu
• Reporter: Cristian Ivascu
• Created: 10/Nov/09 22:52
• Updated: 24/Aug/10 20:50
• Resolved: 23/Dec/09 23:14

Description

When trying to run the balancer, I get a NullPointerException:

2009-11-10 11:08:14,235 ERROR org.apache.hadoop.hdfs.server.balancer.Balancer: java.lang.NullPointerException
at org.apache.hadoop.hdfs.server.namenode.BlockPlacementPolicy.getInstance(BlockPlacementPolicy.java:161)
at org.apache.hadoop.hdfs.server.balancer.Balancer.checkReplicationPolicyCompatibility(Balancer.java:784)
at org.apache.hadoop.hdfs.server.balancer.Balancer.<init>(Balancer.java:792)
at org.apache.hadoop.hdfs.server.balancer.Balancer.main(Balancer.java:814)

This happens when trying to use bin/start-balancer or bin/hdfs balancer -threshold 10

The config files (hdfs-site and core-site) have as fs.default.name hdfs://namenode:9000.