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https://issues.apache.org/jira/browse/ZOOKEEPER-2091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14243864#comment-14243864
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Rakesh R commented on ZOOKEEPER-2091:
-------------------------------------
bq.I am confused how it reads the returning result without finishing sending
the entire packet?
As I remember the situation happened in one of the cluster due to the heavy
system resource usage like cpu/memory was high(due to map reduce job execution).
It was continuously hitting the below exception and all the operations was
failing.
{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)
{code}
Now with the patch, the cluster is running and no issue reported till now.
> 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
> Assignee: Rakesh R
> Fix For: 3.5.1
>
> Attachments: ZOOKEEPER-2091.patch
>
>
> 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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