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From Michael Garcia <Michael.Gar...@alcatelonetouch.com>
Subject Zookeeper is failing to start, and i don't know why...
Date Tue, 06 Dec 2016 17:03:21 GMT
All,
I'm having a problem with zookeeper starting up.  It looks like a hostname resolution problem.
I have /etc/hosts configured correctly, and password less ssh is working.

I have hadoop 2.7.3, java 1.8 u111, zookeeper 3.4.6.

I have 6 systems set up: tc1, tc2, tc3, tc4, tc5, tc6.
tc1 is the active namenode
tc2 is the passive namenode
tc3 -> tc6 are data nodes.
tc1, tc2 and tc3 are the Journal Nodes.

Here is the tail end of the log when I try to start zookeeper on tc1:

2016-12-06 00:59:27,214 INFO org.apache.zookeeper.ZooKeeper: Client environment:java.library.path=/data/tools/repository/hadoop-2.7.3/lib/native
2016-12-06 00:59:27,214 INFO org.apache.zookeeper.ZooKeeper: Client environment:java.io.tmpdir=/tmp
2016-12-06 00:59:27,214 INFO org.apache.zookeeper.ZooKeeper: Client environment:java.compiler=<NA>
2016-12-06 00:59:27,215 INFO org.apache.zookeeper.ZooKeeper: Client environment:os.name=Linux
2016-12-06 00:59:27,215 INFO org.apache.zookeeper.ZooKeeper: Client environment:os.arch=amd64
2016-12-06 00:59:27,215 INFO org.apache.zookeeper.ZooKeeper: Client environment:os.version=4.8.11-1.el7.elrepo.x86_64
2016-12-06 00:59:27,215 INFO org.apache.zookeeper.ZooKeeper: Client environment:user.name=iot-user
2016-12-06 00:59:27,215 INFO org.apache.zookeeper.ZooKeeper: Client environment:user.home=/home/iot-user
2016-12-06 00:59:27,215 INFO org.apache.zookeeper.ZooKeeper: Client environment:user.dir=/data/tools/repository/hadoop-2.7.3
2016-12-06 00:59:27,216 INFO org.apache.zookeeper.ZooKeeper: Initiating client connection,
connectString= tc1:2181,tc2:2181,tc3:2181 sessionTimeout=5000 watcher=org.apache.hadoop.ha.ActiveStandbyElector$WatcherWithClientRef@223d2c72
2016-12-06 00:59:27,230 FATAL org.apache.hadoop.hdfs.tools.DFSZKFailoverController: Got a
fatal error, exiting now
java.net.UnknownHostException:  tc1: Name or service not known
   at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
   at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
     at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
      at java.net.InetAddress.getAllByName0(InetAddress.java:1276)
     at java.net.InetAddress.getAllByName(InetAddress.java:1192)
     at java.net.InetAddress.getAllByName(InetAddress.java:1126)
     at org.apache.zookeeper.client.StaticHostProvider.<init>(StaticHostProvider.java:61)
    at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:445)
   at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:380)
  at org.apache.hadoop.ha.ActiveStandbyElector.getNewZooKeeper(ActiveStandbyElector.java:631)
  at org.apache.hadoop.ha.ActiveStandbyElector.createConnection(ActiveStandbyElector.java:775)
 at org.apache.hadoop.ha.ActiveStandbyElector.<init>(ActiveStandbyElector.java:229)
  at org.apache.hadoop.ha.ZKFailoverController.initZK(ZKFailoverController.java:351)
   at org.apache.hadoop.ha.ZKFailoverController.doRun(ZKFailoverController.java:191)

It looks like hostname resolution is working:

[iot-user@tc1 ~]$ hostname
tc1
[iot-user@tc1 ~]$ ssh tc2
Last login: Mon Dec  5 22:31:21 2016 from 172.31.61.165

[iot-user@tc2 ~]$ exit
logout
Connection to tc2 closed.
[iot-user@tc1 ~]$ ssh tc3
Last login: Mon Dec  5 23:06:06 2016 from 172.31.61.165

[iot-user@tc3 ~]$ exit
logout
Connection to tc3 closed.
[iot-user@tc1 ~]$ arp tc1
tc1 (172.31.61.165) -- no entry

[iot-user@tc1 repository]$ jps
2096 NameNode
10548 Jps
2342 JournalNode
[iot-user@tc1 repository]$ hdfs haadmin -getServiceState tc1
active
[iot-user@tc1 repository]$ hdfs haadmin -getServiceState tc2
standby
[iot-user@tc1 repository]$

Has anyone seen this error?  What am I doing wrong?

Michael Garcia
Cloud Operations Engineer | North America

Mobile +1 949 664 1431
7310 Miramar Road, Suite 440, San Diego, CA 92126








Michael Garcia
Cloud Operations Engineer | North America

Mobile +1 949 664 1431
7310 Miramar Road, Suite 440, San Diego, CA 92126












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