[jira] [Commented] (ZOOKEEPER-2091) Possible logic error in ClientCnxnSocketNIO

[Rakesh R (JIRA)]

    [ 
https://issues.apache.org/jira/browse/ZOOKEEPER-2091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14227396#comment-14227396
 ] 

Rakesh R commented on ZOOKEEPER-2091:
-------------------------------------

Hi,

I've seen the following exception in my environment
{code}
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)
{code}

I'm thinking the reason is due to not adding the packet to the 'pendingQueue'. 
It looks like similar problem occurred here also in the below snippet. What do 
you say?
{code}
ClientCnxnSocketNIO.java

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

> Possible logic error in ClientCnxnSocketNIO
> -------------------------------------------
>
>                 Key: ZOOKEEPER-2091
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2091
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: java client
>    Affects Versions: 3.4.6
>            Reporter: Cheng
>            Priority: Minor
>
> When SASL authentication is enabled, the ZooKeeper client will finally call 
> ClientCnxnSocketNIO#sendPacket(Packet p) to send a packet to server:
> @Override
> void sendPacket(Packet p) throws IOException {
>     SocketChannel sock = (SocketChannel) sockKey.channel();
>     if (sock == null) {
>         throw new IOException("Socket is null!");
>     }
>     p.createBB();
>     ByteBuffer pbb = p.bb;
>     sock.write(pbb);
> }
> One problem I can see is that the sock is non-blocking, so when the sock's 
> output buffer is full(theoretically), only part of the Packet is sent out and 
> the communication will break.



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