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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6722) NetUtils.connect should check that it hasn't connected a socket to itself
Date Sun, 25 Apr 2010 02:23:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12860632#action_12860632

Hadoop QA commented on HADOOP-6722:

+1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 937577.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 2 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/478/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/478/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/478/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/478/console

This message is automatically generated.

> NetUtils.connect should check that it hasn't connected a socket to itself
> -------------------------------------------------------------------------
>                 Key: HADOOP-6722
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6722
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: util
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hadoop-6722.txt
> I had no idea this was possible, but it turns out that a TCP connection will be established
in the rare case that the local side of the socket binds to the ephemeral port that you later
try to connect to. This can present itself in very very rare occasion when an RPC client is
trying to connect to a daemon running on the same node, but that daemon is down. To see what
I'm talking about, run "while true ; do telnet localhost 60020 ; done" on a multicore box
and wait several minutes.
> This can be easily detected in NetUtils.connect by making sure the local address/port
is not equal to the remote address/port.

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