ZooKeeper errors: "Client has seen zxid 0xe our last zxid is 0xd"
-----------------------------------------------------------------

                 Key: HBASE-1491
                 URL: https://issues.apache.org/jira/browse/HBASE-1491
             Project: Hadoop HBase
          Issue Type: Bug
          Components: test
            Reporter: Nitay Joffe
            Assignee: Nitay Joffe
             Fix For: 0.20.0


We have been seeing a lot of these messages in tests:

[junit] 2009-06-02 11:57:23,658 ERROR [NIOServerCxn.Factory:21810] 
server.NIOServerCnxn(514): Client has seen zxid 0xe our last zxid is 0xd


They usually repeat in a seemingly endless loop, such as:

    [junit] 2009-06-02 13:27:54,083 INFO  [main-SendThread] 
zookeeper.ClientCnxn$SendThread(737): Priming connection to 
java.nio.channels.SocketChannel[connected local=/0:0:0:0:0:0:0:1%0:56511 
remote=localhost/0:0:0:0:0:0:0:1:21810]
    [junit] 2009-06-02 13:27:54,084 INFO  [main-SendThread] 
zookeeper.ClientCnxn$SendThread(889): Server connection successful
    [junit] 2009-06-02 13:27:54,093 INFO  [NIOServerCxn.Factory:21810] 
server.NIOServerCnxn(532): Connected to /0:0:0:0:0:0:0:1%0:56511 lastZxid 16
    [junit] 2009-06-02 13:27:54,094 ERROR [NIOServerCxn.Factory:21810] 
server.NIOServerCnxn(543): Client has seen zxid 0x10 our last zxid is 0x4
    [junit] 2009-06-02 13:27:54,094 WARN  [NIOServerCxn.Factory:21810] 
server.NIOServerCnxn(444): Exception causing close of session 0x0 due to 
java.io.IOException: Client has seen zxid 0x10 our last zxid is 0x4
    [junit] 2009-06-02 13:27:54,094 DEBUG [NIOServerCxn.Facto777ry:21810] 
server.NIOServerCnxn(447): IOException stack trace
    [junit] java.io.IOException: Client has seen zxid 0x10 our last zxid is 0x4
    [junit]     at 
org.apache.zookeeper.server.NIOServerCnxn.readConnectRequest(NIOServerCnxn.java:544)
    [junit]     at 
org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:331)
    [junit]     at 
org.apache.zookeeper.server.NIOServerCnxn$Factory.run(NIOServerCnxn.java:176)
    [junit] 2009-06-02 13:27:54,094 INFO  [NIOServerCxn.Factory:21810] 
server.NIOServerCnxn(777): closing session:0x0 NIOServerCnxn: 
java.nio.channels.SocketChannel[connected local=/0:0:0:0:0:0:0:1%0:21810 
remote=/0:0:0:0:0:0:0:1%0:56511]
    [junit] 2009-06-02 13:27:54,097 WARN  [main-SendThread] 
zookeeper.ClientCnxn$SendThread(919): Exception closing session 
0x121a2a7c43a0002 to sun.nio.ch.selectionkeyi...@2c662b4e
    [junit] java.io.IOException: Read error rc = -1 
java.nio.DirectByteBuffer[pos=0 lim=4 cap=4]
    [junit]     at 
org.apache.zookeeper.ClientCnxn$SendThread.doIO(ClientCnxn.java:653)
    [junit]     at 
org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:897)
    [junit] 2009-06-02 13:27:54,097 WARN  [main-SendThread] 
zookeeper.ClientCnxn$SendThread(953): Ignoring exception during shutdown input
    [junit] java.net.SocketException: Socket is not connected
    [junit]     at sun.nio.ch.SocketChannelImpl.shutdown(Native Method)
    [junit]     at 
sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:640)
    [junit]     at 
sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:360)
    [junit]     at 
org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:951)
    [junit]     at 
org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:922)

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