Bhupendra Kumar Jain created ZOOKEEPER-2839:
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Summary: Race condition between AcceptThread and SelectorThread
may allow connections beyond the max client connection limit
Key: ZOOKEEPER-2839
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2839
Project: ZooKeeper
Issue Type: Bug
Reporter: Bhupendra Kumar Jain
Race condition between AcceptThread and SelectorThread may allow connections
beyond the max client connection limit
As per current code in NIOServerCnxnFactory
1. AcceptThread checks for max connection limit , accept the connection and add
to acceptedQueue.
2. Later selector thread will poll the accepted connection , adds the new
connection to the connection map.
So if too many concurrent connection happening at same time from same client
and Selector thread has not yet processed the already accepted connections from
acceptedQueue, then AcceptThread will accept more connections beyond the limit
as it still gets the less current connection count
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