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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3320) NPE in NetworkTopology.getDistance()
Date Mon, 28 Apr 2008 21:15:55 GMT
NPE in NetworkTopology.getDistance()
------------------------------------

                 Key: HADOOP-3320
                 URL: https://issues.apache.org/jira/browse/HADOOP-3320
             Project: Hadoop Core
          Issue Type: Bug
    Affects Versions: 0.14.0
            Reporter: Konstantin Shvachko
            Assignee: Hairong Kuang
             Fix For: 0.18.0


I am seeing the following exception:
{code}
08/04/28 20:15:09 ERROR dfs.NNThroughputBenchmark: java.lang.NullPointerException
	at org.apache.hadoop.net.NetworkTopology.getDistance(NetworkTopology.java:443)
	at org.apache.hadoop.dfs.ReplicationTargetChooser.getPipeline(ReplicationTargetChooser.java:457)
	at org.apache.hadoop.dfs.ReplicationTargetChooser.chooseTarget(ReplicationTargetChooser.java:126)
	at org.apache.hadoop.dfs.ReplicationTargetChooser.chooseTarget(ReplicationTargetChooser.java:72)
	at org.apache.hadoop.dfs.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1140)
	at org.apache.hadoop.dfs.NameNode.addBlock(NameNode.java:300)
	at org.apache.hadoop.dfs.NNThroughputBenchmark$BlockReportStats.addBlocks(NNThroughputBenchmark.java:786)
	at org.apache.hadoop.dfs.NNThroughputBenchmark$BlockReportStats.generateInputs(NNThroughputBenchmark.java:775)
	at org.apache.hadoop.dfs.NNThroughputBenchmark$OperationStatsBase.benchmark(NNThroughputBenchmark.java:203)
	at org.apache.hadoop.dfs.NNThroughputBenchmark.runBenchmark(NNThroughputBenchmark.java:1035)
	at org.apache.hadoop.dfs.NNThroughputBenchmark.main(NNThroughputBenchmark.java:1053)
{code}
It looks like the problem is in NetworkTopology.chooseRandom(String, String), which returns
null in certain cases, but the value returned is never checked for null.

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