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From Rakesh R <rake...@huawei.com>
Subject ZooKeeper client is getting "java.io.IOException: Nothing in the queue, but got "
Date Wed, 26 Nov 2014 15:23:04 GMT
Hi,

Following exception is coming always for the client session 0xf49d7f31e4c0000 in zookeeper
client logs.
Client & server is using kerberoes based sasl authentication mechanism.

I'm using 3.4.6 release.

2014-11-25 22:06:19,114 INFO  [Thread-1-SendThread(vm-216:24002)] Client will use GSSAPI as
SASL mechanism. org.apache.zookeeper.client.ZooKeeperSaslClient$1.run(ZooKeeperSaslClient.java:285)
2014-11-25 22:06:19,114 INFO  [Thread-1-SendThread(vm-216:24002)] Opening socket connection
to server vm-01/**.**.**.**:24002. Will attempt to SASL-authenticate using Login Context section
'Client' org.apache.zookeeper.ClientCnxn$SendThread.logStartConnect(ClientCnxn.java:1000)
2014-11-25 22:06:19,115 INFO  [Thread-1-SendThread(vm-216:24002)] Socket connection established
to vm-216/**.**.**.**:24002, initiating session org.apache.zookeeper.ClientCnxn$SendThread.primeConnection(ClientCnxn.java:855)
2014-11-25 22:06:19,116 INFO  [Thread-1-SendThread(vm-216:24002)] Session establishment complete
on server vm-216/**.**.**.**:24002, sessionid = 0xf49d7f31e4c0000, negotiated timeout = 90000
org.apache.zookeeper.ClientCnxn$SendThread.onConnected(ClientCnxn.java:1260)
2014-11-25 22:06:19,118 WARN  [Thread-1-SendThread(vm-216:24002)] Session 0xf49d7f31e4c0000
for server vm-216/**.**.**.**:24002, unexpected error, closing socket connection and attempting
reconnect org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1127)
java.io.IOException: Nothing in the queue, but got 425467
                at org.apache.zookeeper.ClientCnxn$SendThread.readResponse(ClientCnxn.java:788)
                at org.apache.zookeeper.ClientCnxnSocketNIO.doIO(ClientCnxnSocketNIO.java:94)
                at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:366)
                at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1106)


This exception has occured in the following logic.

CilentCnxn#readResponse()

            synchronized (pendingQueue) {
                if (pendingQueue.size() == 0) {
                    throw new IOException("Nothing in the queue, but got "
                            + replyHdr.getXid());
                }
                packet = pendingQueue.remove();
            }


I failed to find the reason why 'pendingQueue' becomes empty. Only possibility I could see
is the following condition fails and missed to add it to the "pendingQueue"

ClientCnxnSocketNIO.java

                    sock.write(p.bb);
                    if (!p.bb.hasRemaining()) {
                        .....
                        .....
                        .....
                        pendingQueue.add(p);
                    }

Does anyone phase similar issue and would appreciate any help. Thanks!

Thanks & Regards,
Rakesh

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