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Date: Wed, 10 Sep 2014 10:58:53 +0530
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Subject: Getting errors in zookeeper logs
From: lalit jangra <lalit.j.jangra@gmail.com>
To: user@zookeeper.apache.org
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Hi,

I am running cluster of two Apache ManifoldCF nodes on two separate
machines each of which having 3 zookeeper instances (total 6 instances in
cluster). When i am running up manifoldCF agents, i see below warning
during startup.

[http-bio-80-exec-2-SendThread(iwdc1preecma03.iwater.ie:2181)] INFO
org.apache.zookeeper.ClientCnxn - Unable to read additional data from
server sessionid 0x0, likely server has closed socket, closing socket
connection and attempting reconnect

[http-bio-80-exec-2-SendThread(iwdc2preecma04.iwater.ie:2182)] INFO
org.apache.zookeeper.ClientCnxn - Opening socket connection to server
iwdc2preecma04.iwater.ie/10.231.72.25:2182. Will not attempt to
authenticate using SASL (unknown error)


Also i could see below error in logs in while agents are running.

[localhost-startStop-1-SendThread(iwdc1preecma03.iwater.ie:2183)] WARN
org.apache.zookeeper.ClientCnxn - Session 0x6485a8006060079 for server
iwdc1preecma03.iwater.ie/10.231.72.24:2183, unexpected error, closing
socket connection and attempting reconnect

java.io.IOException: Connection reset by peer

        at sun.nio.ch.FileDispatcherImpl.read0(Native Method)

        at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)

        at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:225)

        at sun.nio.ch.IOUtil.read(IOUtil.java:193)

        at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:375)

        at
org.apache.zookeeper.ClientCnxnSocketNIO.doIO(ClientCnxnSocketNIO.java:68)

        at
org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:355)

        at
org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1068)


Below are configurations for 1. zookeeper nodes & 2. MCF nodes for
zookeeper.


*zoo.cfg :  Same for all six zookeeper nodes.*


# The number of milliseconds of each tick

tickTime=2000

dataDir=/app/IW/zookeeper/data/data.1

dataLogDir=/app/IW/zookeeper/logs/log.1

clientPort=2181

server.1=iwdc1preecma03:2888:3888

server.2=iwdc1preecma03:2889:3889

server.3=iwdc1preecma03:2890:3890

server.4=iwdc2preecma04:2891:3891

server.5=iwdc2preecma04:2892:3892

server.6=iwdc2preecma04:2893:3893

# The number of ticks that the initial

# synchronization phase can take

initLimit=10

# The number of ticks that can pass between

# sending a request and getting an acknowledgement

syncLimit=5

# the directory where the snapshot is stored.

# do not use /tmp for storage, /tmp here is just

# example sakes.

#dataDir=/tmp/zookeeper

# the port at which the clients will connect

#clientPort=2181

# the maximum number of client connections.

# increase this if you need to handle more clients

#maxClientCnxns=60

#

# Be sure to read the maintenance section of the

# administrator guide before turning on autopurge.

#

# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance

#

# The number of snapshots to retain in dataDir

autopurge.snapRetainCount=3

# Purge task interval in hours

# Set to "0" to disable auto purge feature

autopurge.purgeInterval=1


*ManifoldCF configurations : same for both ManifoldCF nodes.*


 <property name="org.apache.manifoldcf.lockmanagerclass"
value="org.apache.manifoldcf.core.lockmanager.ZooKeeperLockManager"/>

  <property name="org.apache.manifoldcf.zookeeper.connectstring"
value="iwdc1preecma03:2181,iwdc1preecma03:2182,iwdc1preecma03:2183,iwdc2preecma04:2181,iwdc2preecma04:2182,iwdc2preecma04:2183"/>

<property name="org.apache.manifoldcf.zookeeper.sessiontimeout"
value="4000"/>


*I want to know if due to above warnings/errors, will zookeeper stop
working or will zookeeper will work and these are non-failing messages,
because ManifoldCF jobs are stuck while i can see these errors.*

Please suggest.

Regards,
Lalit.

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