I'm using Cassandra 2.2.8 with default NTR queque configurations ( max_queued_native_transtport_requests = 128, native_transport_max_threads = 128), and from the metrics I'm seeing some native transport requests are being blocked.
I'm trying to understand what happens to the blocked native transport requests, will these requests be rejected immediately so client get exceptions/errors from Cassandra? or will these requests be waiting somewhere outside of the queue and will be added to the NTR queue later? or will these requests simply timeout after some time?
Any help would be appreciated!