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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4058) DirectoryScanner may fail with IOOB if the directory scanning threads return out of volume order
Date Tue, 16 Oct 2012 03:49:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13476701#comment-13476701
] 

Hadoop QA commented on HDFS-4058:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12549244/hdfs-4058.txt
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-hdfs-project/hadoop-hdfs.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/3340//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3340//console

This message is automatically generated.
                
> 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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