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https://issues.apache.org/jira/browse/HADOOP-3320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12606131#action_12606131
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Tsz Wo (Nicholas), SZE commented on HADOOP-3320:
------------------------------------------------
+1 patch looks good
> NPE in NetworkTopology.getDistance()
> ------------------------------------
>
> Key: HADOOP-3320
> URL: https://issues.apache.org/jira/browse/HADOOP-3320
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.14.0
> Reporter: Konstantin Shvachko
> Assignee: Hairong Kuang
> Priority: Blocker
> Fix For: 0.18.0
>
> Attachments: NullWriter.patch
>
>
> 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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