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  1. MariaDB Server
  2. MDEV-13039

innodb_fast_shutdown=0 may fail to purge all undo logs

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    Description

      When a slow shutdown is performed soon after creating some activity for fts_optimize_thread(), it is possible that the optimize thread is starting new transactions after the purge has finished. This is violating the specification of innodb_fast_shutdown, namely that the purge must be completed. (None of the history of new transactions would be purged.)

      The proper fix would seem to declare a flag that indicates whether undo-log-generating background threads are active:

      /** Shut down background threads that can generate undo log. */
      		 
      void
      		 
      srv_shutdown_bg_undo_sources()
      		 
      {
      		 
      	if (srv_bg_undo_sources) {
      		 
      		ut_ad(!srv_read_only_mode);
      		 
      		fts_optimize_shutdown();
      		 
      		dict_stats_shutdown();
      		 
      		srv_bg_undo_sources = false;
      		 
      	}
      		 
      }

      As long as this flag is set, srv_purge_should_exit() must return false.

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          is caused by

          Task - A task that needs to be done. MDEV-5800 indexes on virtual (not materialized) columns

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-12057 Embedded server shutdown hangs in InnoDB

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-12091 Shutdown fails to wait for rollback of recovered transactions to finish

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-12994 innodb_fast_shutdown=0 skips change buffer merge; fast shutdown does it

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-13059 XtraDB hangs on Windows due to failing to release block->lock X-latch in innodb_read_only mode

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-13472 rpl.rpl_semi_sync_wait_point crashes because of thd_destructor_proxy

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-13603 innodb_fast_shutdown=0 may fail to purge all history

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

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              marko Marko Mäkelä
              marko Marko Mäkelä
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                Updated:
                Resolved:

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