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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3618) SSH fencing option may incorrectly succeed if nc (netcat) command not present
Date Wed, 14 Aug 2013 09:19:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13739442#comment-13739442

Hadoop QA commented on HDFS-3618:

{color:red}-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 1 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}.  The javadoc tool did not generate any warning messages.

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

    {color:red}-1 findbugs{color}.  The patch appears to introduce 2 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-HDFS-Build/4820//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/4820//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-common.html
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/4820//console

This message is automatically generated.
> SSH fencing option may incorrectly succeed if nc (netcat) command not present
> -----------------------------------------------------------------------------
>                 Key: HDFS-3618
>                 URL: https://issues.apache.org/jira/browse/HDFS-3618
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: auto-failover
>    Affects Versions: 2.0.0-alpha
>            Reporter: Brahma Reddy Battula
>            Assignee: Vinay
>         Attachments: HDFS-3618.patch, HDFS-3618.patch, HDFS-3618.patch, zkfc_threaddump.out,
> Started NN's and zkfc's in Suse11.
> Suse11 will have netcat installation and netcat -z will work(but nc -z wn't work)..
> While executing following command, got command not found hence rc will be other than
zero and assuming that server was down..Here we are ending up without checking whether service
is down or not..
> {code}
> LOG.info(
>             "Indeterminate response from trying to kill service. " +
>             "Verifying whether it is running using nc...");
>         rc = execCommand(session, "nc -z " + serviceAddr.getHostName() +
>             " " + serviceAddr.getPort());
>         if (rc == 0) {
>           // the service is still listening - we are unable to fence
>           LOG.warn("Unable to fence - it is running but we cannot kill it");
>           return false;
>         } else {
>           LOG.info("Verified that the service is down.");
>           return true;          
>         }
> {code}

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