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https://issues.apache.org/jira/browse/HDFS-4558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Junping Du updated HDFS-4558:
-----------------------------
Attachment: HDFS-4558-v2.patch
Update as Nicholas suggestion in v2 patch. BTW, The default constructor of
balancer consumed by main can work before because its config is initialized
later in ToolRunner. After adding check replication policy, its conf cannot be
null in construct stage, so here we remove the default constructor.
> 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
> Affects Versions: 1.2.0
> Reporter: wenwupeng
> Assignee: Junping Du
> Priority: Critical
> Attachments: HDFS-4558.patch, HDFS-4558-v2.patch
>
>
> 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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