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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