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  1. MariaDB Server
  2. MDEV-20126

Semaphore timeout due to large fulltext indexes

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      MySQL 5.6.45 contains a change that refers to Oracle Bug #25289359 DML/DDL ON LARGE FULLTEXT TABLES CAUSE SEMAPHORE TIMEOUTS AND ASSERTION/SUICIDE.

      There is no test case, but there is debug instrumentation. The change continues the bogus assumption that time(NULL)) is a monotonically increasing sequence. That assumption is demonstrably broken in MDEV-14154. The change might also assume fair scheduling among the threads, which might not hold on a heavily loaded system.

      I think that we should study what the problem is and whether it affects MariaDB, and then come up with a better fix.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-14154 Failing assertion: slot->last_run <= current_time in fts0opt.cc

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

          Task - A task that needs to be done. MDEV-16264 Implement a common work queue for InnoDB background tasks

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

          Task - A task that needs to be done. MDEV-20127 Merge new release of InnoDB 5.6.45 to 10.1

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

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              thiru Thirunarayanan Balathandayuthapani
              marko Marko Mäkelä
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