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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3618) If RC is other than zero, we are assuming that Service is down (What if NC command itself not found..?)
Date Mon, 09 Jul 2012 23:52:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409963#comment-13409963
] 

Aaron T. Myers commented on HDFS-3618:
--------------------------------------

Good catch, Brahma.

How about changing the summary of this JIRA to something like "SSH fencing option may incorrectly
succeed if netcat command not present" ?
                
> If RC is other than zero, we are assuming that Service is down (What if NC command itself
not found..?)
> -------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3618
>                 URL: https://issues.apache.org/jira/browse/HDFS-3618
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: auto-failover
>            Reporter: Brahma Reddy Battula
>         Attachments: zkfc.txt, 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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