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From "tangshangwen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11308) NameNode doFence state judgment problem
Date Mon, 09 Jan 2017 22:05:58 GMT
tangshangwen created HDFS-11308:

             Summary: 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
[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
[2017-01-10T01:42:37.234+08:00] [WARN] hadoop.ha.SshFenceByTcpPort.pump(StreamPumper.java
88) [nc -z BJYF-Druid-17224.hadoop.jd.local 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 BJYF-Druid-17224.hadoop.jd.local
8021 via ssh: Ncat: Try `--help' or man(1) ncat for more information, usage options and help.

When I perform nc an exception occurs, the return value is 2, and cannot confirm sshfence
success´╝îthis may lead to some problems
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;          

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