wenwupeng created HDFS-4558:
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Summary: start balancer failed with NPE
Key: HDFS-4558
URL: https://issues.apache.org/jira/browse/HDFS-4558
Project: Hadoop HDFS
Issue Type: Bug
Components: balancer
Reporter: wenwupeng
Priority: Critical
Fix For: 1.2.0
start balancer failed with NPE
File this issue to track for QE and dev take a look
balancer.log:
2013-03-06 00:19:55,174 ERROR org.apache.hadoop.hdfs.server.balancer.Balancer:
java.lang.NullPointerException
at
org.apache.hadoop.hdfs.server.namenode.BlockPlacementPolicy.getInstance(BlockPlacementPolicy.java:165)
at
org.apache.hadoop.hdfs.server.balancer.Balancer.checkReplicationPolicyCompatibility(Balancer.java:799)
at org.apache.hadoop.hdfs.server.balancer.Balancer.<init>(Balancer.java:808)
at org.apache.hadoop.hdfs.server.balancer.Balancer.main(Balancer.java:831)
Balancer.java
private void checkReplicationPolicyCompatibility(Configuration conf)
throws UnsupportedActionException {
if (!(BlockPlacementPolicy.getInstance(conf, null, null) <== here
instanceof BlockPlacementPolicyDefault))
{ throw new UnsupportedActionException( "Balancer without
BlockPlacementPolicyDefault"); }
}
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