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e8b7fceb82
Starting with MariaDB 10.5, roughly after MDEV-23855 was fixed, we are observing sporadic hangs during the execution of the RESET MASTER statement. We are hoping to fix the hangs with these changes, but due to the rather infrequent occurrence of the hangs and our inability to reliably reproduce the hangs, we cannot be sure of this. What we do know is that innodb_force_recovery=2 (or a larger setting) will prevent srv_master_callback (the former srv_master_thread) from running. In that mode, periodic log flushes would never occur and RESET MASTER could hang indefinitely. That is demonstrated by the new test case that was developed by Andrei Elkin. We fix this case by implementing a special case for it. This also includes some code cleanup and renames of misleadingly named code. The interface has nothing to do with log checkpoints in the storage engine; it is only about requesting log writes to be persistent. handlerton::commit_checkpoint_request, commit_checkpoint_notify_ha(): Remove the unused parameter hton. log_requests.start: Replaces pending_checkpoint_list. log_requests.end: Replaces pending_checkpoint_list_end. log_requests.mutex: Replaces pending_checkpoint_mutex. log_flush_notify_and_unlock(), log_flush_notify(): Replaces innobase_mysql_log_notify(). The new implementation should be functionally equivalent to the old one. innodb_log_flush_request(): Replaces innobase_checkpoint_request(). Implement a fast path for common cases, and reduce the mutex hold time. POSSIBLE FIX OF THE HANG: We will invoke commit_checkpoint_notify_ha() for the current request if it is already satisfied, as well as invoke log_flush_notify_and_unlock() for any satisfied requests. log_write(): Invoke log_flush_notify() when the write is already durable. This was missing WITH_PMEM when the log is in persistent memory. Reviewed by: Vladislav Vaintroub |
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| archive | ||
| blackhole | ||
| cassandra | ||
| columnstore | ||
| connect | ||
| csv | ||
| example | ||
| federated | ||
| federatedx | ||
| heap | ||
| innobase | ||
| maria | ||
| mroonga | ||
| myisam | ||
| myisammrg | ||
| oqgraph | ||
| perfschema | ||
| rocksdb | ||
| sequence | ||
| sphinx | ||
| spider | ||
| test_sql_discovery | ||
| tokudb | ||