Refactored switching logic

Author: tolik0

airbyte_cdk/sources/declarative/incremental/concurrent_partition_cursor.py

@@ -58,7 +58,8 @@ class ConcurrentPerPartitionCursor(Cursor):
     CurrentPerPartitionCursor expects the state of the ConcurrentCursor to follow the format {cursor_field: cursor_value}.
     """
 
-    DEFAULT_MAX_PARTITIONS_NUMBER = 1000
+    DEFAULT_MAX_PARTITIONS_NUMBER = 10_000
+    SWITCH_TO_GLOBAL_LIMIT = 1000
     _NO_STATE: Mapping[str, Any] = {}
     _NO_CURSOR_STATE: Mapping[str, Any] = {}
     _GLOBAL_STATE_KEY = "state"
@@ -99,7 +100,7 @@ def __init__(
         self._new_global_cursor: Optional[StreamState] = None
         self._lookback_window: int = 0
         self._parent_state: Optional[StreamState] = None
-        self._over_limit: int = 0
+        self._number_of_partitions: int = 0
         self._use_global_cursor: bool = False
         self._partition_serializer = PerPartitionKeySerializer()
 
@@ -233,8 +234,8 @@ def _ensure_partition_limit(self) -> None:
           or removed due to being the oldest.
         """
         with self._lock:
+            self._number_of_partitions += 1
             while len(self._cursor_per_partition) > self.DEFAULT_MAX_PARTITIONS_NUMBER - 1:
-                self._over_limit += 1
                 # Try removing finished partitions first
                 for partition_key in list(self._cursor_per_partition.keys()):
                     if (
@@ -245,7 +246,7 @@ def _ensure_partition_limit(self) -> None:
                             partition_key
                         )  # Remove the oldest partition
                         logger.warning(
-                            f"The maximum number of partitions has been reached. Dropping the oldest finished partition: {oldest_partition}. Over limit: {self._over_limit}."
+                            f"The maximum number of partitions has been reached. Dropping the oldest finished partition: {oldest_partition}. Over limit: {self._number_of_partitions}."
                         )
                         break
                 else:
@@ -254,7 +255,7 @@ def _ensure_partition_limit(self) -> None:
                         1
                     ]  # Remove the oldest partition
                     logger.warning(
-                        f"The maximum number of partitions has been reached. Dropping the oldest partition: {oldest_partition}. Over limit: {self._over_limit}."
+                        f"The maximum number of partitions has been reached. Dropping the oldest partition: {oldest_partition}. Over limit: {self._number_of_partitions}."
                     )
 
     def _set_initial_state(self, stream_state: StreamState) -> None:
@@ -355,6 +356,10 @@ def _set_global_state(self, stream_state: Mapping[str, Any]) -> None:
 
     def observe(self, record: Record) -> None:
         if not self._use_global_cursor and self.limit_reached():
+            logger.info(
+                f"Exceeded the 'SWITCH_TO_GLOBAL_LIMIT' of {self.SWITCH_TO_GLOBAL_LIMIT}. "
+                f"Switching to global cursor for {self._stream_name}."
+            )
             self._use_global_cursor = True
 
         if not record.associated_slice:
@@ -397,4 +402,4 @@ def _get_cursor(self, record: Record) -> ConcurrentCursor:
         return cursor
 
     def limit_reached(self) -> bool:
-        return self._over_limit > self.DEFAULT_MAX_PARTITIONS_NUMBER
+        return self._number_of_partitions > self.SWITCH_TO_GLOBAL_LIMIT