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  1. MariaDB Server
  2. MDEV-7324

Lock-free hash for table definition cache

Details

    • Task
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Fixed
    • 10.1.3
    • OTHER
    • None

    Description

      Table definition hash is protected by pthread rwlock, which doesn't scale very well. Replacing it with lock-free hash solves this bottleneck.

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          relates to

          Epic - Created by Jira Software - do not edit or delete. Issue type for a big user story that needs to be broken down. MDEV-6478 MariaDB on Power8

          • Major - Major loss of function.
          • Closed
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            svoj Sergey Vojtovich added a comment -

            serg please review patch for this task. At the moment of writing the patch for some reason didn't hit commits@, but it was pushed to bb-power:

            commit b2f45ba8280c97f8dc8b1adb3234cf2e28e48982
            		 
            Author: Sergey Vojtovich <svoj@mariadb.org>
            		 
            Date:   Mon Dec 22 19:56:48 2014 +0400
            		 
             
            		 
                MDEV-7324 - Lock-free hash for table definition cache
            		 
             
            		 
            commit ea8862aa9ffa1cfac9a99bbe0fe9b539f12b9a19
            		 
            Author: Sergey Vojtovich <svoj@mariadb.org>
            		 
            Date:   Wed Dec 3 13:56:22 2014 +0400
            		 
             
            		 
                MDEV-6089 - MySQL WL#7305 "Improve MDL scalability by using lock-free hash"
            		 
             
            		 
                This is prerequisite for MDEV-6089. Added lf_hash_search_using_hash_value(),
            		 
                which can reuse previously calculated hash value.

            svoj Sergey Vojtovich added a comment - serg please review patch for this task. At the moment of writing the patch for some reason didn't hit commits@, but it was pushed to bb-power: commit b2f45ba8280c97f8dc8b1adb3234cf2e28e48982 Author: Sergey Vojtovich <svoj@mariadb.org> Date: Mon Dec 22 19:56:48 2014 +0400   MDEV-7324 - Lock-free hash for table definition cache   commit ea8862aa9ffa1cfac9a99bbe0fe9b539f12b9a19 Author: Sergey Vojtovich <svoj@mariadb.org> Date: Wed Dec 3 13:56:22 2014 +0400   MDEV-6089 - MySQL WL#7305 "Improve MDL scalability by using lock-free hash"   This is prerequisite for MDEV-6089. Added lf_hash_search_using_hash_value(), which can reuse previously calculated hash value.
            svoj Sergey Vojtovich added a comment -

            Just for the record: this patch survived 15 hours of various stress tests. Regression test suite went well too.

            svoj Sergey Vojtovich added a comment - Just for the record: this patch survived 15 hours of various stress tests. Regression test suite went well too.

            People

              svoj Sergey Vojtovich
              svoj Sergey Vojtovich
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                Resolved:

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