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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12363) Possible NPE in BlockManager$StorageInfoDefragmenter#scanAndCompactStorages
Date Fri, 01 Sep 2017 05:40:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12363?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mingliang Liu updated HDFS-12363:
---------------------------------
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 3.0.0-beta1
           Status: Resolved  (was: Patch Available)

+1

Committed to {{trunk}} branch. Thanks for your contribution [~xiaochen]. Thanks for your review
[~jojochuang].

> Possible NPE in BlockManager$StorageInfoDefragmenter#scanAndCompactStorages
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-12363
>                 URL: https://issues.apache.org/jira/browse/HDFS-12363
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.6.0
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>             Fix For: 3.0.0-beta1
>
>         Attachments: HDFS-12363.01.patch, HDFS-12363.02.patch
>
>
> Saw NN going down with NPE below:
> {noformat}
> ERROR org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: Thread received Runtime
exception.
> java.lang.NullPointerException
> at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$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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