cassandra.concurrent - Utilities for Concurrent Statement Execution
cassandra.io.asyncorereactor - asyncore Event Loop
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An unrecoverable error was hit when attempting to use a connection, or the connection was already closed or defunct.
Raised when a connection has been marked as defunct or has been closed.
An attempt was made to send a message through a Connection that was already at the max number of in-flight operations.
Communication did not match the protocol that this driver expects.