🐛Director-v2: properly close dask client when use is completed

packages/service-library/src/servicelib/rabbitmq/rpc_interfaces/clusters_keeper/clusters.py

@@ -6,13 +6,18 @@
 from models_library.rabbitmq_basic_types import RPCMethodName
 from models_library.users import UserID
 from models_library.wallets import WalletID
+from pydantic import TypeAdapter
 
 from ....async_utils import run_sequentially_in_context
 from ..._client_rpc import RabbitMQRPCClient
 from ..._constants import RPC_REMOTE_METHOD_TIMEOUT_S
 
 _TTL_CACHE_ON_CLUSTERS_S: Final[int] = 5
 
+_GET_OR_CREATE_CLUSTER_METHOD_NAME: Final[RPCMethodName] = TypeAdapter(
+    RPCMethodName
+).validate_python("get_or_create_cluster")
+
 
 @run_sequentially_in_context(target_args=["user_id", "wallet_id"])
 @cached(
@@ -32,7 +37,7 @@ async def get_or_create_cluster(
     # the 2nd decorator ensure that many calls in a short time will return quickly the same value
     on_demand_cluster: OnDemandCluster = await client.request(
         CLUSTERS_KEEPER_RPC_NAMESPACE,
-        RPCMethodName("get_or_create_cluster"),
+        _GET_OR_CREATE_CLUSTER_METHOD_NAME,
         timeout_s=RPC_REMOTE_METHOD_TIMEOUT_S,
         user_id=user_id,
         wallet_id=wallet_id,

services/director-v2/src/simcore_service_director_v2/modules/comp_scheduler/_scheduler_base.py

@@ -589,6 +589,12 @@ async def _process_executing_tasks(
     ) -> None:
         """process executing tasks from the 3rd party backend"""
 
+    @abstractmethod
+    async def _release_resources(
+        self, user_id: UserID, project_id: ProjectID, comp_run: CompRunsAtDB
+    ) -> None:
+        """release resources used by the scheduler for a given user and project"""
+
     async def apply(
         self,
         *,
@@ -654,6 +660,7 @@ async def apply(
 
                 # 7. Are we done scheduling that pipeline?
                 if not dag.nodes() or pipeline_result in COMPLETED_STATES:
+                    await self._release_resources(user_id, project_id, comp_run)
                     # there is nothing left, the run is completed, we're done here
                     _logger.info(
                         "pipeline %s scheduling completed with result %s",

services/director-v2/src/simcore_service_director_v2/modules/comp_scheduler/_scheduler_dask.py

@@ -4,7 +4,7 @@
 from collections.abc import AsyncIterator, Callable
 from contextlib import asynccontextmanager
 from dataclasses import dataclass
-from typing import Any
+from typing import Any, Final
 
 import arrow
 from dask_task_models_library.container_tasks.errors import TaskCancelledError
@@ -23,7 +23,7 @@
 from models_library.users import UserID
 from pydantic import PositiveInt
 from servicelib.common_headers import UNDEFINED_DEFAULT_SIMCORE_USER_AGENT_VALUE
-from servicelib.logging_utils import log_catch
+from servicelib.logging_utils import log_catch, log_context
 
 from ...core.errors import (
     ComputationalBackendNotConnectedError,
@@ -56,13 +56,16 @@
 
 _logger = logging.getLogger(__name__)
 
+_DASK_CLIENT_RUN_REF: Final[str] = "{user_id}:{run_id}"
+
 
 @asynccontextmanager
 async def _cluster_dask_client(
     user_id: UserID,
     scheduler: "DaskScheduler",
     *,
     use_on_demand_clusters: bool,
+    run_id: PositiveInt,
     run_metadata: RunMetadataDict,
 ) -> AsyncIterator[DaskClient]:
     cluster: BaseCluster = scheduler.settings.default_cluster
@@ -72,7 +75,9 @@ async def _cluster_dask_client(
             user_id=user_id,
             wallet_id=run_metadata.get("wallet_id"),
         )
-    async with scheduler.dask_clients_pool.acquire(cluster) as client:
+    async with scheduler.dask_clients_pool.acquire(
+        cluster, ref=_DASK_CLIENT_RUN_REF.format(user_id=user_id, run_id=run_id)
+    ) as client:
         yield client
 
 
@@ -101,6 +106,7 @@ async def _start_tasks(
             user_id,
             self,
             use_on_demand_clusters=comp_run.use_on_demand_clusters,
+            run_id=comp_run.run_id,
             run_metadata=comp_run.metadata,
         ) as client:
             # Change the tasks state to PENDING
@@ -151,6 +157,7 @@ async def _get_tasks_status(
                 user_id,
                 self,
                 use_on_demand_clusters=comp_run.use_on_demand_clusters,
+                run_id=comp_run.run_id,
                 run_metadata=comp_run.metadata,
             ) as client:
                 return await client.get_tasks_status([f"{t.job_id}" for t in tasks])
@@ -171,6 +178,7 @@ async def _process_executing_tasks(
                 user_id,
                 self,
                 use_on_demand_clusters=comp_run.use_on_demand_clusters,
+                run_id=comp_run.run_id,
                 run_metadata=comp_run.metadata,
             ) as client:
                 task_progresses = await client.get_tasks_progress(
@@ -217,6 +225,22 @@ async def _process_executing_tasks(
             )
         )
 
+    async def _release_resources(
+        self, user_id: UserID, project_id: ProjectID, comp_run: CompRunsAtDB
+    ) -> None:
+        """release resources used by the scheduler for a given user and project"""
+        with (
+            log_catch(_logger, reraise=False),
+            log_context(
+                _logger,
+                logging.INFO,
+                msg=f"releasing resources for {user_id=}, {project_id=}, {comp_run.run_id=}",
+            ),
+        ):
+            await self.dask_clients_pool.release_client_ref(
+                ref=_DASK_CLIENT_RUN_REF.format(user_id=user_id, run_id=comp_run.run_id)
+            )
+
     async def _stop_tasks(
         self, user_id: UserID, tasks: list[CompTaskAtDB], comp_run: CompRunsAtDB
     ) -> None:
@@ -226,6 +250,7 @@ async def _stop_tasks(
                 user_id,
                 self,
                 use_on_demand_clusters=comp_run.use_on_demand_clusters,
+                run_id=comp_run.run_id,
                 run_metadata=comp_run.metadata,
             ) as client:
                 await asyncio.gather(
@@ -259,6 +284,7 @@ async def _process_completed_tasks(
                 user_id,
                 self,
                 use_on_demand_clusters=comp_run.use_on_demand_clusters,
+                run_id=comp_run.run_id,
                 run_metadata=comp_run.metadata,
             ) as client:
                 tasks_results = await asyncio.gather(
@@ -278,6 +304,7 @@ async def _process_completed_tasks(
                 user_id,
                 self,
                 use_on_demand_clusters=comp_run.use_on_demand_clusters,
+                run_id=comp_run.run_id,
                 run_metadata=comp_run.metadata,
             ) as client:
                 await asyncio.gather(

services/director-v2/src/simcore_service_director_v2/modules/dask_client.py

@@ -120,43 +120,42 @@ async def create(
         tasks_file_link_type: FileLinkType,
         cluster_type: ClusterTypeInModel,
     ) -> "DaskClient":
-        _logger.info(
-            "Initiating connection to %s with auth: %s, type: %s",
-            f"dask-scheduler at {endpoint}",
-            authentication,
-            cluster_type,
-        )
-        async for attempt in AsyncRetrying(
-            reraise=True,
-            before_sleep=before_sleep_log(_logger, logging.INFO),
-            wait=wait_fixed(0.3),
-            stop=stop_after_attempt(3),
+        with log_context(
+            _logger,
+            logging.INFO,
+            msg=f"create dask client to dask-scheduler at {endpoint=} with {authentication=}, {cluster_type=}",
         ):
-            with attempt:
-                _logger.debug(
-                    "Connecting to %s, attempt %s...",
-                    endpoint,
-                    attempt.retry_state.attempt_number,
-                )
-                backend = await connect_to_dask_scheduler(endpoint, authentication)
-                dask_utils.check_scheduler_status(backend.client)
-                instance = cls(
-                    app=app,
-                    backend=backend,
-                    settings=settings,
-                    tasks_file_link_type=tasks_file_link_type,
-                    cluster_type=cluster_type,
-                )
-                _logger.info(
-                    "Connection to %s succeeded [%s]",
-                    f"dask-scheduler at {endpoint}",
-                    json_dumps(attempt.retry_state.retry_object.statistics),
-                )
-                _logger.info(
-                    "Scheduler info:\n%s",
-                    json_dumps(backend.client.scheduler_info(), indent=2),
-                )
-                return instance
+            async for attempt in AsyncRetrying(
+                reraise=True,
+                before_sleep=before_sleep_log(_logger, logging.INFO),
+                wait=wait_fixed(0.3),
+                stop=stop_after_attempt(3),
+            ):
+                with attempt:
+                    _logger.debug(
+                        "Connecting to %s, attempt %s...",
+                        endpoint,
+                        attempt.retry_state.attempt_number,
+                    )
+                    backend = await connect_to_dask_scheduler(endpoint, authentication)
+                    dask_utils.check_scheduler_status(backend.client)
+                    instance = cls(
+                        app=app,
+                        backend=backend,
+                        settings=settings,
+                        tasks_file_link_type=tasks_file_link_type,
+                        cluster_type=cluster_type,
+                    )
+                    _logger.info(
+                        "Connection to %s succeeded [%s]",
+                        f"dask-scheduler at {endpoint}",
+                        json_dumps(attempt.retry_state.retry_object.statistics),
+                    )
+                    _logger.info(
+                        "Scheduler info:\n%s",
+                        json_dumps(backend.client.scheduler_info(), indent=2),
+                    )
+                    return instance
         # this is to satisfy pylance
         err_msg = "Could not create client"
         raise ValueError(err_msg)