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Summary: In debug mode, we are seeing assertion failure as follows ``` db/compaction/compaction_iterator.cc:980: void rocksdb::CompactionIterator::PrepareOutput(): \ Assertion `ikey_.type != kTypeDeletion && ikey_.type != kTypeSingleDeletion' failed. ``` It is caused by releasing earliest snapshot during compaction between the execution of `NextFromInput()` and `PrepareOutput()`. In one case, as demonstrated in unit test `WritePreparedTransaction.ReleaseEarliestSnapshotDuringCompaction_WithSD2`, incorrect result may be returned by a following range scan if we disable assertion, as in opt compilation level: the SingleDelete marker's sequence number is zeroed out, but the preceding PUT is also outputted to the SST file after compaction. Due to the logic of DBIter, the PUT will not be skipped and will be returned by iterator in range scan. https://github.com/facebook/rocksdb/issues/8661 illustrates what happened. Fix by taking a more conservative approach: make compaction zero out sequence number only if key is in the earliest snapshot when the compaction starts. Another assertion failure is ``` Assertion `current_user_key_snapshot_ == last_snapshot' failed. ``` It's caused by releasing the snapshot between the PUT and SingleDelete during compaction. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8608 Test Plan: make check Reviewed By: jay-zhuang Differential Revision: D30145645 Pulled By: riversand963 fbshipit-source-id: 699f58e66faf70732ad53810ccef43935d3bbe81 |
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| .. | ||
| lock | ||
| optimistic_transaction.cc | ||
| optimistic_transaction.h | ||
| optimistic_transaction_db_impl.cc | ||
| optimistic_transaction_db_impl.h | ||
| optimistic_transaction_test.cc | ||
| pessimistic_transaction.cc | ||
| pessimistic_transaction.h | ||
| pessimistic_transaction_db.cc | ||
| pessimistic_transaction_db.h | ||
| snapshot_checker.cc | ||
| transaction_base.cc | ||
| transaction_base.h | ||
| transaction_db_mutex_impl.cc | ||
| transaction_db_mutex_impl.h | ||
| transaction_test.cc | ||
| transaction_test.h | ||
| transaction_util.cc | ||
| transaction_util.h | ||
| write_prepared_transaction_test.cc | ||
| write_prepared_txn.cc | ||
| write_prepared_txn.h | ||
| write_prepared_txn_db.cc | ||
| write_prepared_txn_db.h | ||
| write_unprepared_transaction_test.cc | ||
| write_unprepared_txn.cc | ||
| write_unprepared_txn.h | ||
| write_unprepared_txn_db.cc | ||
| write_unprepared_txn_db.h | ||