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  1. Hadoop HDFS
  2. HDFS-11308

NameNode doFence state judgment problem

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Duplicate
    • Affects Version/s: 2.7.1
    • Fix Version/s: None
    • Component/s: auto-failover
    • Labels:
      None
    • Environment:

      CentOS Linux release 7.1.1503 (Core)

      Description

      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 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.
      

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

      SshFenceByTcpPort.java
      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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            • Assignee:
              Unassigned
              Reporter:
              tangshangwen Shangwen Tang

              Dates

              • Created:
                Updated:
                Resolved:

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