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The "FAQ" page has been changed by Adrien Rivard: http://wiki.apache.org/cassandra/FAQ?action=diff&rev1=136&rev2=137 <<Anchor(dropped_messages)>> == Why do I see "... messages dropped.." in the logs? == - Internode messages which are received by a node, but do not get not to be processed within rpc_timeout are dropped rather than processed. As the coordinator node will no longer be waiting for a response. If the Coordinator node does not receive Consistency Level responses before the rpc_timeout it will return a !TimedOutExcpetion to the client. If the coordinator receives Consistency Level responses it will return success to the client. + Internode messages which are received by a node, but do not get not to be processed within rpc_timeout are dropped rather than processed. As the coordinator node will no longer be waiting for a response. If the Coordinator node does not receive Consistency Level responses before the rpc_timeout it will return a !TimedOutException to the client. If the coordinator receives Consistency Level responses it will return success to the client. For MUTATION messages this means that the mutation was not applied to all replicas it was sent to. The inconsistency will be repaired by Read Repair or Anti Entropy Repair.