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https://issues.apache.org/jira/browse/ZOOKEEPER-737?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Hunt updated ZOOKEEPER-737:
-----------------------------------

    Status: Open  (was: Patch Available)

> some 4 letter words may fail with netcat (nc)
> ---------------------------------------------
>
>                 Key: ZOOKEEPER-737
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-737
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.3.0
>            Reporter: Patrick Hunt
>            Assignee: Mahadev konar
>            Priority: Blocker
>             Fix For: 3.3.1, 3.4.0
>
>         Attachments: ZOOKEEPER-737.patch, ZOOKEEPER-737.patch, 
> ZOOKEEPER-737.patch, ZOOKEEPER-737.patch
>
>
> nc closes the write channel as soon as it's sent it's information, for 
> example "echo stat|nc localhost 2181"
> in general this is fine, however the server code will close the socket as 
> soon as it receives notice that nc has
> closed it's write channel. if not all the 4 letter word result has been 
> written back to the client yet, this will cause
> some or all of the result to be lost - ie the client will not see the full 
> result. this was introduced in 3.3.0 as part
> of a change to reduce blocking of the selector by long running 4letter words.
> here's an example of the logs from the server during this
> echo -n stat | nc localhost 2181
> 2010-04-09 21:55:36,124 - INFO  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:nioservercnxn$fact...@251] - 
> Accepted socket connection from /127.0.0.1:42179
> 2010-04-09 21:55:36,124 - INFO  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:nioserverc...@968] - Processing 
> stat command from /127.0.0.1:42179
> 2010-04-09 21:55:36,125 - WARN  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:nioserverc...@606] - 
> EndOfStreamException: Unable to read additional data from client sessionid 
> 0x0, likely client has closed socket
> 2010-04-09 21:55:36,125 - INFO  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:nioserverc...@1286] - Closed 
> socket connection for client /127.0.0.1:42179 (no session established for 
> client)
> [ph...@gsbl90850 zookeeper-3.3.0]$ 2010-04-09 21:55:36,126 - ERROR 
> [Thread-15:nioserverc...@422] - Unexpected Exception: 
> java.nio.channels.CancelledKeyException
>       at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:55)
>       at sun.nio.ch.SelectionKeyImpl.interestOps(SelectionKeyImpl.java:59)
>       at 
> org.apache.zookeeper.server.NIOServerCnxn.sendBuffer(NIOServerCnxn.java:395)
>       at 
> org.apache.zookeeper.server.NIOServerCnxn$SendBufferWriter.checkFlush(NIOServerCnxn.java:907)
>       at 
> org.apache.zookeeper.server.NIOServerCnxn$SendBufferWriter.flush(NIOServerCnxn.java:945)
>       at java.io.BufferedWriter.flush(BufferedWriter.java:236)
>       at java.io.PrintWriter.flush(PrintWriter.java:276)
>       at 
> org.apache.zookeeper.server.NIOServerCnxn$2.run(NIOServerCnxn.java:1089)
> 2010-04-09 21:55:36,126 - ERROR [Thread-15:nioservercnxn$factor...@82] - 
> Thread Thread[Thread-15,5,main] died
> java.nio.channels.CancelledKeyException
>       at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:55)
>       at sun.nio.ch.SelectionKeyImpl.interestOps(SelectionKeyImpl.java:64)
>       at 
> org.apache.zookeeper.server.NIOServerCnxn$SendBufferWriter.wakeup(NIOServerCnxn.java:927)
>       at 
> org.apache.zookeeper.server.NIOServerCnxn$SendBufferWriter.checkFlush(NIOServerCnxn.java:909)
>       at 
> org.apache.zookeeper.server.NIOServerCnxn$SendBufferWriter.flush(NIOServerCnxn.java:945)
>       at java.io.BufferedWriter.flush(BufferedWriter.java:236)
>       at java.io.PrintWriter.flush(PrintWriter.java:276)
>       at 
> org.apache.zookeeper.server.NIOServerCnxn$2.run(NIOServerCnxn.java:1089)

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