| ################################################################################ |
| # 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. |
| ################################################################################ |
| |
| """ |
| Commit rollback to rollback 'COMPACT' commits for resolving conflicts. |
| """ |
| |
| from pypaimon.table.instant import Instant |
| |
| |
| class CommitRollback: |
| """Rollback COMPACT commits to resolve conflicts. |
| |
| When a conflict is detected during commit, if the latest snapshot is a |
| COMPACT commit, it can be rolled back via TableRollback. |
| """ |
| |
| def __init__(self, table_rollback): |
| """Initialize CommitRollback. |
| |
| Args: |
| table_rollback: A TableRollback instance used to perform the rollback. |
| """ |
| self._table_rollback = table_rollback |
| |
| def try_to_rollback(self, latest_snapshot): |
| """Try to rollback a COMPACT commit to resolve conflicts. |
| |
| Only rolls back COMPACT type commits. Delegates to TableRollback |
| to rollback to the previous snapshot (latest - 1), passing the |
| latest snapshot ID as from_snapshot. |
| |
| Args: |
| latest_snapshot: The latest snapshot that may need to be rolled back. |
| |
| Returns: |
| True if rollback succeeded, False otherwise. |
| """ |
| if latest_snapshot.commit_kind == "COMPACT": |
| latest_id = latest_snapshot.id |
| try: |
| self._table_rollback.rollback_to( |
| Instant.snapshot(latest_id - 1), latest_id) |
| return True |
| except Exception: |
| pass |
| return False |
