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From Nitay <nit...@gmail.com>
Subject Errors during shutdown/startup of ZooKeeper
Date Tue, 02 Jun 2009 21:12:28 GMT
Hey guys,

We are getting a lot of messages like this in HBase:

[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

For more context, the block it usually appears in is:

    [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.SelectionKeyImpl@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)


This happens in a seemingly endless loop. We are not quite sure what it
means. Can someone help shed some light on these messages?

Thanks,
-n

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