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Date: Mon, 9 Jan 2017 22:51:58 +0000 (UTC)
From: "Masatake Iwasaki (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13033201.1483999518000.690392.1484002318562@Atlassian.JIRA>
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Subject: [jira] [Commented] (HDFS-11308) NameNode doFence state judgment
 problem
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archived-at: Mon, 09 Jan 2017 22:52:02 -0000


    [ https://issues.apache.org/jira/browse/HDFS-11308?page=3Dcom.atlassian=
.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D1581=
3108#comment-15813108 ]=20

Masatake Iwasaki commented on HDFS-11308:
-----------------------------------------

nc is alias of ncat which does not have "-z" option in CentOS 7. There seem=
s to be some replacement by using bash.
http://stackoverflow.com/questions/4922943/test-from-shell-script-if-remote=
-tcp-port-is-open

> 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.doFenc=
e(SshFenceByTcpPort.java 147) [Health Monitor for NameNode at xxx-xxx-172xx=
x.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(S=
treamPumper.java 88) [nc -z xxx-xxx-172xx.hadoop.xx.com 8021 via ssh: Strea=
mPumper 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(S=
treamPumper.java 88) [nc -z xxx-xxx-172xx.hadoop.xxx.com 8021 via ssh: Stre=
amPumper for STDERR] : nc -z xxx-xxx-17224.hadoop.xxx.com 8021 via ssh: Nca=
t: 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=EF=BC=8Cthis may lead to some problems
> {code:title=3DSshFenceByTcpPort.java|borderStyle=3Dsolid}
> rc =3D execCommand(session, "nc -z " + serviceAddr.getHostName() +
>             " " + serviceAddr.getPort());
>         if (rc =3D=3D 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;         =20
>         }
> {code}


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