Brahma Reddy Battula created HDFS-3618:
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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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