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From Nikolay Ponomarenko <nikolay.ponomare...@altium.com>
Subject Network error while working from windows and connection limit exceeded
Date Thu, 28 Jun 2012 09:19:20 GMT
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

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