[GitHub] [airflow] dstandish commented on a change in pull request #20838: Add `db clean` CLI command for purging old data

[GitBox <gi...@apache.org>]

dstandish commented on a change in pull request #20838:
URL: https://github.com/apache/airflow/pull/20838#discussion_r802174128



##########
File path: airflow/utils/metastore_cleanup.py
##########
@@ -0,0 +1,310 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+
+import logging
+from contextlib import AbstractContextManager
+from dataclasses import dataclass
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, Union
+
+from pendulum import DateTime
+from sqlalchemy import and_, false, func
+from sqlalchemy.exc import OperationalError
+
+from airflow.cli.simple_table import AirflowConsole
+from airflow.jobs.base_job import BaseJob
+from airflow.models import (
+    Base,
+    DagModel,
+    DagRun,
+    ImportError,
+    Log,
+    RenderedTaskInstanceFields,
+    SlaMiss,
+    TaskFail,
+    TaskInstance,
+    TaskReschedule,
+    XCom,
+)
+from airflow.utils import timezone
+from airflow.utils.session import NEW_SESSION, provide_session
+
+if TYPE_CHECKING:
+    from sqlalchemy.orm import Query, Session
+    from sqlalchemy.orm.attributes import InstrumentedAttribute
+    from sqlalchemy.sql.schema import Column
+
+
+@dataclass
+class _TableConfig:
+    """
+    Config class for performing cleanup on a table
+
+    :param orm_model: the table
+    :param recency_column: date column to filter by
+    :param keep_last: whether the last record should be kept even if it's older than clean_before_timestamp
+    :param keep_last_filters:
+    :param keep_last_group_by: if keeping the last record, can keep the last record for each group
+    :param warn_if_missing: If True, then we'll suppress "table missing" exception and log a warning.
+        If False then the exception will go uncaught.
+    """
+
+    orm_model: Base
+    recency_column: Union["Column", "InstrumentedAttribute"]
+    keep_last: bool = False
+    keep_last_filters: Optional[Any] = None
+    keep_last_group_by: Optional[Any] = None
+    warn_if_missing: bool = False
+
+    def __lt__(self, other):
+        return self.orm_model.__tablename__ < self.orm_model.__tablename__
+
+    @property
+    def readable_config(self):
+        return dict(
+            table=self.orm_model.__tablename__,
+            recency_column=str(self.recency_column),
+            keep_last=self.keep_last,
+            keep_last_filters=[str(x) for x in self.keep_last_filters] if self.keep_last_filters else None,
+            keep_last_group_by=str(self.keep_last_group_by),
+            warn_if_missing=str(self.warn_if_missing),
+        )
+
+
+config_list: List[_TableConfig] = [
+    _TableConfig(orm_model=BaseJob, recency_column=BaseJob.latest_heartbeat),
+    _TableConfig(orm_model=DagModel, recency_column=DagModel.last_parsed_time),
+    _TableConfig(
+        orm_model=DagRun,
+        recency_column=DagRun.start_date,
+        keep_last=True,
+        keep_last_filters=[DagRun.external_trigger == false()],
+        keep_last_group_by=DagRun.dag_id,
+    ),
+    _TableConfig(orm_model=ImportError, recency_column=ImportError.timestamp),
+    _TableConfig(orm_model=Log, recency_column=Log.dttm),
+    _TableConfig(
+        orm_model=RenderedTaskInstanceFields, recency_column=RenderedTaskInstanceFields.execution_date
+    ),
+    _TableConfig(orm_model=SlaMiss, recency_column=SlaMiss.timestamp),
+    _TableConfig(orm_model=TaskFail, recency_column=TaskFail.start_date),
+    _TableConfig(orm_model=TaskInstance, recency_column=TaskInstance.start_date),

Review comment:
       in the current version of airflow, there are foreign key relationships defined with `on delete cascade` so there should be no dangling objects i think




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