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Zookeeper, mail # user - Network error while working from windows and connection limit exceeded


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Re: Network error while working from windows and connection limit exceeded
Patrick Hunt 2012-06-28, 16:24
The server protects against a client DOSing the cluster (typically by
accident) by limiting the number of maxClientCnxns from a particular
host. Either set the limit higher, turn it off, or change your client
logic to reduce the number of clients on a host (granted not always
possible if this is testing).

Patrick

On Thu, Jun 28, 2012 at 2:19 AM, Nikolay Ponomarenko
<[EMAIL PROTECTED]> wrote:
> Hello
>
> We are testing ZooKeeper 3.4.3 as distributed lock engine.
> Pascal wrapper under Windows client c library.
>
> When i start more than maxClientCnxns connections, client log is full
> of errors:
>
> 2012-06-28 14:37:06,381:1608(0x8c0):ZOO_ERROR@handle_socket_error_msg@1723:
> Socket [192.168.1.13:2181] zk retcode=-4, errno=32(Broken pipe):
> failed while receiving a server response
> ...
> 2012-06-28 14:37:21,896:1608(0xf30):ZOO_ERROR@handle_socket_error_msg@1481:
> Socket [192.168.1.13:2181] zk retcode=-4, errno=10035(Unknown error):
> failed to send a handshake packet: Unknown error
> 2012-06-28 14:37:21,896:1608(0x8c0):ZOO_ERROR@handle_socket_error_msg@1481:
> Socket [192.168.1.13:2181] zk retcode=-4, errno=10035(Unknown error):
> failed to send a handshake packet: Unknown error
>
> Server log:
>
> 2012-06-28 11:47:27,453 - WARN
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@634] -
> EndOfStreamException: Unable to read additional data from client
> sessionid 0x39383129b54a0031, likely client has closed socket
> 2012-06-28 11:47:27,453 - INFO
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1435] -
> Closed socket connection for client /192.168.3.1:59641 which had
> sessionid 0x39383129b54a0031
> 2012-06-28 11:47:27,471 - ERROR
> [CommitProcessor:313:NIOServerCnxn@445] - Unexpected Exception:
> java.nio.channels.CancelledKeyException
>        at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:73)
>        at sun.nio.ch.SelectionKeyImpl.interestOps(SelectionKeyImpl.java:77)
>        at org.apache.zookeeper.server.NIOServerCnxn.sendBuffer(NIOServerCnxn.java:418)
>        at org.apache.zookeeper.server.NIOServerCnxn.sendResponse(NIOServerCnxn.java:1509)
>        at org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:359)
>        at org.apache.zookeeper.server.quorum.CommitProcessor.run(CommitProcessor.java:73)
>
>
> Is there any way properly handle such errors from client side?
>
> --
> Nikolay Ponomarenko