[Neo4j] HA - Unable to read additional data from server sessionid 0x0

Peter Neubauer peter.neubauer at neotechnology.com
Wed Mar 14 16:26:10 CET 2012


Nice,
glad it worked out!

Cheers,

/peter neubauer

G:  neubauer.peter
S:  peter.neubauer
P:  +46 704 106975
L:   http://www.linkedin.com/in/neubauer
T:   @peterneubauer

Neo4j 1.6 released                 - dzone.com/6S4K
The Neo4j Heroku Challenge   - http://neo4j-challenge.herokuapp.com/



On Wed, Mar 14, 2012 at 4:25 PM, Samuel Feng <okosioc at gmail.com> wrote:
> Thanks a lot, Peter.
>
> I found another way to bring it up again,
>
> As I thought there should be some incorrect status stored in the graph,
> maybe start up the master instance in Non-HA mode can rectify the status. I
> tried and that works. Now the HA cluster is running normally.
>
> However, to prevent it happen again, I will setup a 3-node zk cluster.
> Thanks a lot~
>
> Thanks and Regards,
>
> Samuel
>
> 2012/3/14 Peter Neubauer <peter.neubauer at neotechnology.com>
>
>> Hi there,
>> I talked to Chris Gioran and got the following diagnostics:
>>
>> "This* is
>> what happens when in a quorum of 2 ZK instances one goes down.
>>
>> (*this == the remaining ZK instance - which is not in standalone mode
>> - will refuse to accept requests, hence the ZooClient in neo will barf
>> and die).
>>
>> Reproduced it in exactly the same manner: started a 2 ZK quorum and 2
>> neo instances using it, brought down one of the zk servers and
>> restarted one neo instance - it refused to come online again. If that
>> is what you did, then that is what happened."
>>
>> To bring it up again, I think you need to get a 3 - node ZK cluster up
>> and running again before it will accept new cluster nodes again.
>>
>> Cheers,
>>
>> /peter neubauer
>>
>> G:  neubauer.peter
>> S:  peter.neubauer
>> P:  +46 704 106975
>> L:   http://www.linkedin.com/in/neubauer
>> T:   @peterneubauer
>>
>> Neo4j 1.6 released                 - dzone.com/6S4K
>> The Neo4j Heroku Challenge   - http://neo4j-challenge.herokuapp.com/
>>
>>
>>
>> On Mon, Mar 12, 2012 at 2:00 PM, Samuel Feng <okosioc at gmail.com> wrote:
>> > Dear List,
>> >
>> > I am using neo4j 1.6.1 and embedded HA Mode.
>> >
>> > The cluster(with 2 servers) works normally at the beginning. However,
>> after
>> > one server crashed, the cluster can not start up and keep return below
>> > logs. Seems both of the two servers are trying to connect each other but
>> > failed again again.
>> >
>> > I tried to remove the version-2 folder to reset the cluster. But the
>> > problem exits. Could you please help me how to recover the cluster?
>> Thanks
>> > a lot
>> >
>> > =2012-03-12 20:58:45,946 main-SendThread(125.65.108.89:2181) INFO  -
>> > [ClientCnxn$SendThread.startConnect] Opening socket connection to server
>> > 125.65.108.23/125.65.108.23:2181
>> > =2012-03-12 20:58:45,947 main-SendThread(125.65.108.23:2181) INFO  -
>> > [ClientCnxn$SendThread.primeConnection] Socket connection established to
>> > 125.65.108.23/125.65.108.23:2181, initiating session
>> > =2012-03-12 20:58:45,950 main-SendThread(125.65.108.23:2181) INFO  -
>> > [ClientCnxn$SendThread.run] Unable to read additional data from server
>> > sessionid 0x0, likely server has closed socket, closing socket connection
>> > and attempting reconnect
>> > =2012-03-12 20:58:46,066 main-SendThread(125.65.108.89:2181) INFO  -
>> > [ClientCnxn$SendThread.startConnect] Opening socket connection to server
>> > 125.65.108.23/125.65.108.23:2181
>> > =2012-03-12 20:58:46,067 main-SendThread(125.65.108.23:2181) INFO  -
>> > [ClientCnxn$SendThread.primeConnection] Socket connection established to
>> > 125.65.108.23/125.65.108.23:2181, initiating session
>> > =2012-03-12 20:58:46,068 main-SendThread(125.65.108.23:2181) INFO  -
>> > [ClientCnxn$SendThread.run] Unable to read additional data from server
>> > sessionid 0x0, likely server has closed socket, closing socket connection
>> > and attempting reconnect
>> > =2012-03-12 20:58:46,153 main-SendThread(125.65.108.23:2181) INFO  -
>> > [ClientCnxn$SendThread.startConnect] Opening socket connection to server
>> > 125.65.108.89/125.65.108.89:2181
>> > =2012-03-12 20:58:46,157 main-SendThread(125.65.108.89:2181) INFO  -
>> > [ClientCnxn$SendThread.primeConnection] Socket connection established to
>> > 125.65.108.89/125.65.108.89:2181, initiating session
>> > =2012-03-12 20:58:46,160 main-SendThread(125.65.108.89:2181) INFO  -
>> > [ClientCnxn$SendThread.run] Unable to read additional data from server
>> > sessionid 0x0, likely server has closed socket, closing socket connection
>> > and attempting reconnect
>> > =2012-03-12 20:58:46,802 main-SendThread(125.65.108.23:2181) INFO  -
>> > [ClientCnxn$SendThread.startConnect] Opening socket connection to server
>> > 125.65.108.89/125.65.108.89:2181
>> > =2012-03-12 20:58:46,806 main-SendThread(125.65.108.89:2181) INFO  -
>> > [ClientCnxn$SendThread.primeConnection] Socket connection established to
>> > 125.65.108.89/125.65.108.89:2181, initiating session
>> > =2012-03-12 20:58:46,812 main-SendThread(125.65.108.89:2181) INFO  -
>> > [ClientCnxn$SendThread.run] Unable to read additional data from server
>> > sessionid 0x0, likely server has closed socket, closing socket connection
>> > and attempting reconnect
>> >
>> > Thanks a lot,
>> >
>> > Samuel
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