Xiao Chen created HDFS-12363:
--------------------------------
Summary: Possible NPE in
BlockManager$StorageInfoDefragmenter#scanAndCompactStorages
Key: HDFS-12363
URL: https://issues.apache.org/jira/browse/HDFS-12363
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 2.6.0
Reporter: Xiao Chen
Assignee: Xiao Chen
Saw NN going down with NPE below:
{noformat}
ERROR org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: Thread
received Runtime exception.
java.lang.NullPointerException
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$StorageInfoDefragmenter.scanAndCompactStorages(BlockManager.java:3897)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$StorageInfoDefragmenter.run(BlockManager.java:3852)
at java.lang.Thread.run(Thread.java:745)
2017-08-21 22:14:05,303 INFO org.apache.hadoop.util.ExitUtil: Exiting with
status 1
2017-08-21 22:14:05,313 INFO org.apache.hadoop.hdfs.server.namenode.NameNode:
{noformat}
In that version, {{BlockManager}} code is:
{code}
3896 try {
3897 DatanodeStorageInfo storage = datanodeManager.
3898 getDatanode(datanodesAndStorages.get(i)).
3899 getStorageInfo(datanodesAndStorages.get(i + 1));
3900 if (storage != null) {
{code}
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