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Date: Mon, 9 Jul 2012 09:33:36 +0000 (UTC)
From: "Brahma Reddy Battula (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
Message-ID: <697650902.22062.1341826416509.JavaMail.jiratomcat@issues-vm>
Subject: [jira] [Created] (HDFS-3618) IF RC is other than zero are we
 assuming that Service is down (What if NC command itself not found)
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Brahma Reddy Battula created HDFS-3618:
------------------------------------------

             Summary: IF RC is other than zero are we 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


Started NN's and zkfc's are 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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