1

Author: dkropachev

cassandra/policies.py

@@ -1045,8 +1045,9 @@ class LimitedConcurrencyShardConnectionBackoffPolicy(ShardConnectionBackoffPolic
     For backoff calculation, it requires either a `cassandra.policies.ShardConnectionBackoffSchedule` or
     a `cassandra.policies.ReconnectionPolicy`, as both expose the same API.
 
-    The backoff schedule is initiated when the first request for a given `host_id` is received.
-    If there are no remaining requests for that `host_id`, the schedule is reset.
+    It spawns threads when there are pending requests, maximum number of threads is `max_concurrent` multiplied by nodes in the cluster.
+    When thread is spawn it initiates backoff schedule, which is local for this thread.
+    If there are no remaining requests for that `host_id`, thread is killed.
 
     This policy also prevents multiple pending or scheduled connections for the same (host, shard) pair;
     any duplicate attempts to schedule a connection are silently ignored.