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https://issues.apache.org/jira/browse/HDFS-11308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15813607#comment-15813607
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Brahma Reddy Battula commented on HDFS-11308:
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bq.nc is alias of ncat which does not have "-z" option in CentOS 7.
Even Suse also same issue..Please have look at HDFS-3618.
> NameNode doFence state judgment problem
> ---------------------------------------
>
> Key: HDFS-11308
> URL: https://issues.apache.org/jira/browse/HDFS-11308
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: auto-failover
> Affects Versions: 2.7.1
> Environment: CentOS Linux release 7.1.1503 (Core)
> Reporter: tangshangwen
>
> In our Cluster, I found some abnormal in ZKFC log
> {noformat}
> [2017-01-10T01:42:37.168+08:00] [INFO]
> hadoop.ha.SshFenceByTcpPort.doFence(SshFenceByTcpPort.java 147) [Health
> Monitor for NameNode at
> xxx-xxx-172xxx.hadoop.xxx.com/xxx.xxx.172.xxx:8021-EventThread] :
> Indeterminate response from trying to kill service. Verifying whether it is
> running using nc...
> [2017-01-10T01:42:37.234+08:00] [WARN]
> hadoop.ha.SshFenceByTcpPort.pump(StreamPumper.java 88) [nc -z
> xxx-xxx-172xx.hadoop.xx.com 8021 via ssh: StreamPumper for STDERR] : nc -z
> xxx-xxx-172xx.hadoop.xxx.com 8021 via ssh: nc: invalid option -- 'z'
> [2017-01-10T01:42:37.235+08:00] [WARN]
> hadoop.ha.SshFenceByTcpPort.pump(StreamPumper.java 88) [nc -z
> xxx-xxx-172xx.hadoop.xxx.com 8021 via ssh: StreamPumper for STDERR] : nc -z
> xxx-xxx-17224.hadoop.xxx.com 8021 via ssh: Ncat: Try `--help' or man(1) ncat
> for more information, usage options and help. QUITTING.
> {noformat}
> When I perform nc an exception occurs, the return value is 2, and cannot
> confirm sshfence success，this may lead to some problems
> {code:title=SshFenceByTcpPort.java|borderStyle=solid}
> 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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