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Posted to common-dev@hadoop.apache.org by "Robert Chansler (JIRA)" <ji...@apache.org> on 2008/05/02 20:02:55 UTC
[jira] Updated: (HADOOP-3320) NPE in NetworkTopology.getDistance()
[ https://issues.apache.org/jira/browse/HADOOP-3320?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Robert Chansler updated HADOOP-3320:
------------------------------------
Component/s: dfs
> 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
> 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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