[jira] Created: (ZOOKEEPER-106) CancelledKeyException

["Flavio Paiva Junqueira (JIRA)" <ji...@apache.org>]

CancelledKeyException
---------------------

                 Key: ZOOKEEPER-106
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-106
             Project: Zookeeper
          Issue Type: Bug
            Reporter: Flavio Paiva Junqueira


This exception seems to be harmless, but I thought it would be a good idea to document it just in case I overlooked anything. I think it is harmless because it is thrown inside the while loop that obtains the keys ready for I/O on Factory.run(). The penalty is skipping all other keys available in the for loop that follows the select call, but since we call again select in the next interation, we don't miss much. An optimizatio, however, would be catching this exception inside the for loop to avoid the extra call to select.  

{noformat}
2008-07-24 21:09:03,894 -  ERROR - [NIOServerCxn.Factory:NIOServerCnxn$Factory@152] - FIXMSG
java.nio.channels.CancelledKeyException
        at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:55)
        at sun.nio.ch.SelectionKeyImpl.readyOps(SelectionKeyImpl.java:69)
        at com.yahoo.zookeeper.server.NIOServerCnxn$Factory.run(NIOServerCnxn.java:136)
2008-07-24 21:09:06,912 -  ERROR - [NIOServerCxn.Factory:NIOServerCnxn$Factory@152] - FIXMSG
java.nio.channels.CancelledKeyException
        at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:55)
        at sun.nio.ch.SelectionKeyImpl.readyOps(SelectionKeyImpl.java:69)
        at com.yahoo.zookeeper.server.NIOServerCnxn$Factory.run(NIOServerCnxn.java:136)
{noformat}

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