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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10353) FsUrlStreamHandlerFactory is not thread safe
Date Thu, 27 Feb 2014 11:16:21 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13914403#comment-13914403

Hadoop QA commented on HADOOP-10353:

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

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

    {color:green}+1 tests included{color}.  The patch appears to include 2 new or modified
test files.

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

    {color:green}+1 javadoc{color}.  There were no new javadoc 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-common-project/hadoop-common

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

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/3614//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/3614//console

This message is automatically generated.

> FsUrlStreamHandlerFactory is not thread safe
> --------------------------------------------
>                 Key: HADOOP-10353
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10353
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 2.3.0
>            Reporter: Tudor Scurtu
>            Assignee: Tudor Scurtu
>              Labels: race-condition
>         Attachments: HADOOP-10353.patch, HADOOP-10353.v2.patch
> The {{FsUrlStreamHandlerFactory}} class uses a plain {{HashMap}} for caching.
> When the number of inserted values exceeds the the map's load threshold, it triggers
a rehash. During this time, a different thread that performs a get operation on a previously
inserted key can obtain a null value instead of the actual value associated with that key.
> The result is a NPE potentially being thrown when calling {{FsUrlStreamHandlerFactory#createURLStreamHandler(String
protocol)}} concurrently.

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