BELUGA BEHR created HDFS-13155:
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Summary: Not Checking Return Value for NULL
Key: HDFS-13155
URL: https://issues.apache.org/jira/browse/HDFS-13155
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Affects Versions: 3.0.0
Reporter: BELUGA BEHR
{code:title=BlockPlacementPolicyDefault.java}
protected Node chooseTargetInOrder(int numOfReplicas,
Node writer,
final Set<Node> excludedNodes,
final long blocksize,
final int maxNodesPerRack,
final List<DatanodeStorageInfo> results,
final boolean avoidStaleNodes,
final boolean newBlock,
EnumMap<StorageType, Integer> storageTypes)
throws NotEnoughReplicasException {
final int numOfResults = results.size();
if (numOfResults == 0) {
writer = chooseLocalStorage(writer, excludedNodes, blocksize,
maxNodesPerRack, results, avoidStaleNodes, storageTypes, true)
.getDatanodeDescriptor();
if (--numOfReplicas == 0) {
return writer;
}
}
...
{code}
The method {{chooseLocalStorage}} can return a _null_ value but it's not being
checked here and the method {{getDatanodeDescriptor()}} is immediately being
called on the result. Please check for a _null_ value first.
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