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  1. MariaDB Server
  2. MDEV-27461

Server hangs when the bufferpool is shrunk to 8M and innodb_page_size=64K

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      Observation on
      origin/preview-10.8-MDEV-14425-innodb f6b1e6fbae27842f78b28ad8ceb898e6008841d1 2022-01-07T18:59:05+02:00
      One RQG test starts the server with innodb_page_size 64K and bufferpool_size 256M,
      performs a bufferpool resizing down to 8M (message in server error log) and fails during or short after that with
      [ERROR] [FATAL] InnoDB: innodb_fatal_semaphore_wait_threshold was exceeded for dict_sys.latch.
       
      Per my experiences with server startup on official versions of MariaDB
      InnoDB denies to work in case the page_size is 64K and the bufferpool_size
      is < 24M because of whatever reasons.
      Nevertheless InnoDB does not deny a resizing of the bufferpool to 8M at runtime.
       
      The MTR based test reports on
      - origin/10.7  2022-01-06
         SET GLOBAL innodb_buffer_pool_size = 8388608;
         Warnings:
         Warning 1210    innodb_buffer_pool_size must be at least innodb_buffer_pool_chunk_size=25165824
      - origin/10.8 897d8c57b68858a58eea6cda4d971c3a94f6cc4a 2021-11-29
        a warning like above
      - origin/10.8 commit baace572dc1d2ab35145556e9db231dca8c18147 (HEAD)
         MDEV-25342: autosize innodb_buffer_pool_chunk_size
         mysqltest: At line 11: query 'SET GLOBAL innodb_buffer_pool_size = @innodb_buffer_pool_size_save' failed: ER_WRONG_ARGUMENTS (1210): Another buffer pool resize is already in progress.
         which is caused by the ongoing asynchronous buffer pool resizing to 8M issued earlier.
         The server error log shows
         2022-01-10 17:59:45 4 [Note] InnoDB: Requested to resize buffer pool. (new size: 8388608 bytes)
         2022-01-10 17:59:45 0 [Note] InnoDB: Resizing buffer pool from 25165824 to 8388608 (unit=1048576).
      
      

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        1. MDEV-27461.txt
          472 kB
        2. BPR.tgz
          10 kB

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              Assignee:
              marko Marko Mäkelä
              Reporter:
              mleich Matthias Leich
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                Resolved:

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