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Date: Tue, 16 Sep 2014 01:35:38 -0700
From: Flavio Junqueira <fpjunqueira@yahoo.com.INVALID>
Reply-To: Flavio Junqueira <fpjunqueira@yahoo.com>
Subject: Re: Getting errors in zookeeper logs
To: "user@zookeeper.apache.org" <user@zookeeper.apache.org>
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What if you use 'zkServer.sh start-foreground' to debug?

-Flavio


On Tuesday, September 16, 2014 5:20 AM, lalit jangra <lalit.j.jangra@gmail.com> wrote:
 

>
>
>Hello Flavio,
>
>I am using 'zkServer.sh start' command to start zookeeper nodes. I also
>could see logs in log folders in have specified but these logs are in a
>form which is difficult to understand.
>
>Also  regarding to using 6 zookeeper nodes (3+3), is it fine to handle
>failures as per 50% rule as if 3 are down my cluster should work or should
>i move to having odd numbers such as 5 or 7 here?
>
>Regards.
>
>On Tue, Sep 16, 2014 at 4:26 AM, Flavio Junqueira <
>fpjunqueira@yahoo.com.invalid> wrote:
>
>> Instead of guessing, I think it is best if we understand what's going
>> wrong with the servers, you need to look at the server logs. If you don't
>> know how to get it, could you please share the command you're using to
>> start servers?
>>
>> -Flavio
>>
>>
>>
>> On Monday, September 15, 2014 3:30 PM, lalit jangra <
>> lalit.j.jangra@gmail.com> wrote:
>>
>>
>> >
>> >
>> >Hello Flavio,
>> >
>> >Can this issue arise from system not having enough RAM for Java Heap as i
>> >could see  my system is running on top of its RAM?
>> >
>> >Also is there any way to assign memory to zookeeper nodes?
>> >
>> >Regards.
>> >
>> >On Mon, Sep 15, 2014 at 7:37 PM, lalit jangra <lalit.j.jangra@gmail.com>
>> >wrote:
>> >
>> >> Thanks Flavio,
>> >>
>> >> I am having 3+3 zookeeper nodes on two servers MCF1 & MCF2. Also i could
>> >> see same error on both nodes. For logs into servers, i am not able to
>> read
>> >> anything from these, how can i read and interpret from zookeeper servers
>> >> what is wrong?
>> >>
>> >> I have put different log & data directories for each of zookeeper, may
>> be
>> >> i should elaborate a bit more. I am deciding on names of logs & data
>> >> directory as per myid (ranging from 1 to 6).
>> >>
>> >> ZK1 -> Data.1 -> Logs.1
>> >> ZK2 -> Data.2 -> Logs.2
>> >> ZK3 -> Data.3 -> Logs.3
>> >> ZK4 -> Data.4 -> Logs.4
>> >> ZK5 -> Data.5 -> Logs.5
>> >> ZK6 -> Data.6 -> Logs.6
>> >>
>> >> As i have two servers only and i need to make it running on these two
>> only
>> >> so i chose this architecture. Also i am trying to make even for scenario
>> >> where one node is down, i have only 3 zookeepers down so still second is
>> >> working. If i have odd numbers say 5 or 7, if server with more numbers
>> of
>> >> zookeeper is down, its gone.
>> >>
>> >> Regards.
>> >>
>> >>
>> >> On Mon, Sep 15, 2014 at 7:29 PM, Flavio Junqueira <
>> >> fpjunqueira@yahoo.com.invalid> wrote:
>> >>
>> >>> I believe you have shared just the client-side errors, and I was
>> >>> wondering what's going on with the servers. One problem I could spot
>> with
>> >>> the configuration is with the values of dataDir and dataLogDir. It
>> looks
>> >>> like the processes on the same node are writing to the same directory,
>> >>> which should be confusing the servers.
>> >>>
>> >>> A couple of things about your setting. I'm not sure what your
>> motivation
>> >>> is to put multiple servers on the same node. It will induce correlated
>> >>> crashes for the servers on the same node. Also, we in general
>> recommend to
>> >>> use an odd number of servers (5 or 7 for your case).
>> >>>
>> >>> -Flavio
>> >>>
>> >>> On Wednesday, September 10, 2014 6:29 AM, lalit jangra <
>> >>> lalit.j.jangra@gmail.com> wrote:
>> >>>
>> >>>
>> >>> >
>> >>> >
>> >>> >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.
>
>> >
>> >>> >
>> >>> >
>> >>> >
>> >>
>> >>
>> >>
>> >>
>> >> --
>> >> Regards,
>> >> Lalit.
>> >>
>> >
>> >
>> >
>> >--
>> >Regards,
>> >Lalit.
>> >
>> >
>> >
>>
>
>
>
>-- 
>Regards,
>Lalit.
>
>
>
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