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https://issues.apache.org/jira/browse/HDFS-4058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13476666#comment-13476666
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Hudson commented on HDFS-4058:
------------------------------
Integrated in Hadoop-trunk-Commit #2865 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/2865/])
HDFS-4058. DirectoryScanner may fail with IOOB if the directory scanning
threads return out of volume order. Contributed by Eli Collins (Revision
1398612)
Result = SUCCESS
eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1398612
Files :
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DirectoryScanner.java
> DirectoryScanner may fail with IOOB if the directory scanning threads return
> out of volume order
> ------------------------------------------------------------------------------------------------
>
> Key: HDFS-4058
> URL: https://issues.apache.org/jira/browse/HDFS-4058
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Affects Versions: 2.0.0-alpha
> Reporter: Eli Collins
> Assignee: Eli Collins
> Fix For: 2.0.3-alpha
>
> Attachments: hdfs-4058.txt, hdfs-4058.txt
>
>
> The DirectoryScanner may fail with an IOOB if the directory scanning threads
> return out of volume order (ie volume scanner #3 returns before volume
> scanner #2). This is because it's using an ArrayList and ArrayList#add(index,
> element) throws IOOB if idx >= size, and size is only increased as elements
> are added, therefore adds have to be done in index order. Since we know the
> size when we create the ArrayList let's just use an array (perhaps an
> ArrayList was used originally because someone thought array creation called
> the default constructor?).
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