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Posted to hdfs-issues@hadoop.apache.org by "Xiao Chen (JIRA)" <ji...@apache.org> on 2017/08/28 05:40:00 UTC
[jira] [Updated] (HDFS-12363) Possible NPE in
BlockManager$StorageInfoDefragmenter#scanAndCompactStorages
[ https://issues.apache.org/jira/browse/HDFS-12363?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Xiao Chen updated HDFS-12363:
-----------------------------
Attachment: HDFS-12363.01.patch
Attaching a simple patch to fix this. Unit test looks to be very hard. Hoping this NPE fix could go without one.
> Possible NPE in BlockManager$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
> Attachments: HDFS-12363.01.patch
>
>
> 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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