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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-7104) Remove unnecessary DNS reverse lookups from RPC layer
Date Fri, 14 Jan 2011 23:43:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12981977#action_12981977

Hadoop QA commented on HADOOP-7104:

+1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 1058881.

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

    +1 tests included.  The patch appears to include 3 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 (version 1.3.9) 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.

    +1 system test framework.  The patch passed system test framework compile.

Test results: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/184//testReport/
Findbugs warnings: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/184//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/184//console

This message is automatically generated.

> Remove unnecessary DNS reverse lookups from RPC layer
> -----------------------------------------------------
>                 Key: HADOOP-7104
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7104
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc, security
>            Reporter: Kan Zhang
>            Assignee: Kan Zhang
>         Attachments: 7104-few-edits.patch, c7104-01.patch, c7104-03.patch
> RPC connection authorization needs to verify client's Kerberos principal name matches
what specified for the protocol. For service clients like DN's, their Kerberos principal names
can be specified in the form of  "datanode/_HOST@DOMAIN.COM". To get the expected
> client principal name, the server needs to substitute "_HOST" with the client's fully
qualified domain name, which requires a reverse DNS lookup from client IP address. However,
for connections from clients whose principal name are either unspecified or specified not
using the "_HOST" convention, the substitution is not required and the reverse DNS lookup
should be avoided. Currently the reverse DNS lookup is done for all clients, which could slow
services like NN down, when local named cache is not available.

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