ConfX created HDFS-17109:
----------------------------
Summary: Null Pointer Exception when running TestBlockManager
Key: HDFS-17109
URL: https://issues.apache.org/jira/browse/HDFS-17109
Project: Hadoop HDFS
Issue Type: Bug
Reporter: ConfX
Attachments: reproduce.sh
h2. What happened
After setting {{{}dfs.namenode.redundancy.considerLoadByStorageType=true{}}},
running test
{{org.apache.hadoop.hdfs.server.blockmanagement.TestBlockManager#testOneOfTwoRacksDecommissioned}}
results in a {{{}NullPointerException{}}}.
h2. Where's the bug
In the class {{{}BlockPlacementPolicyDefault{}}}:
{noformat}
for (StorageType s : storageTypes) {
StorageTypeStats storageTypeStats = storageStats.get(s);
numNodes += storageTypeStats.getNodesInService();
numXceiver += storageTypeStats.getNodesInServiceXceiverCount();
}{noformat}
However, the class does not check if the storageTypeStats is null, causing the
NPE.
h2. How to reproduce
# Set {{dfs.namenode.redundancy.considerLoadByStorageType=true}}
# Run
{{org.apache.hadoop.hdfs.server.blockmanagement.TestBlockManager#testOneOfTwoRacksDecommissioned}}
and the following exception should be observed:
{noformat}
java.lang.NullPointerException
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.getInServiceXceiverAverageByStorageType(BlockPlacementPolicyDefault.java:1044)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.getInServiceXceiverAverage(BlockPlacementPolicyDefault.java:1023)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.excludeNodeByLoad(BlockPlacementPolicyDefault.java:1000)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.isGoodDatanode(BlockPlacementPolicyDefault.java:1086)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseRandom(BlockPlacementPolicyDefault.java:855)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseRemoteRack(BlockPlacementPolicyDefault.java:782)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTargetInOrder(BlockPlacementPolicyDefault.java:557)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:478)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:350)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault.chooseTarget(BlockPlacementPolicyDefault.java:170)
at
org.apache.hadoop.hdfs.server.blockmanagement.ReplicationWork.chooseTargets(ReplicationWork.java:51)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReconstructionWorkForBlocks(BlockManager.java:2031)
at
org.apache.hadoop.hdfs.server.blockmanagement.TestBlockManager.scheduleSingleReplication(TestBlockManager.java:641)
at
org.apache.hadoop.hdfs.server.blockmanagement.TestBlockManager.doTestOneOfTwoRacksDecommissioned(TestBlockManager.java:364)
at
org.apache.hadoop.hdfs.server.blockmanagement.TestBlockManager.testOneOfTwoRacksDecommissioned(TestBlockManager.java:351){noformat}
For an easy reproduction, run the reproduce.sh in the attachment.
We are happy to provide a patch if this issue is confirmed.
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