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  1. MariaDB Server
  2. MDEV-33543

Server hang caused by InnoDB change buffer

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      The problem was found on
         origin/10.6-MDEV-33508 208f3ee34381f7c8a79d114f610c42bb53a5f394 2024-02-21T11:35:06+02:00
      Per Marko the official 10.6 would suffer from that too.
       
      Scenario:
      1. Start the server and generate some initial data.
      2. 33 "worker" run concurrent some DML mix
      3. Some RQG component checks periodic the processlist.
      pluto:/data/results/1708610110/HANG1/rqg.log
      Line 1322 (2024-02-22T16:08:28)  9 workers active, the other have disconnected
             They all run some INSERT IGNORE INTO ... (one row only).
      Line 1797 (2024-02-22T16:12:39) 9 workers active
             They all run the same statement like above.
             Only the time was going up by ~ 250s.
       
      State  somewhere between 16:12:39 and 16:16 
      pluto:/data/results/1708610110/HANG1$ gdb -c ./1/data/gcore.2353714 /data/Server_bin/10.6-MDEV-33508_debug_Og/bin/mariadbd
      State  somewhere between 16:16 and 16:19
      pluto:/data/results/1708610110/HANG1$ gdb -c ./1/data/core.2353714 /data/Server_bin/10.6-MDEV-33508_debug_Og/bin/mariadbd
       
      RQG
      ===
      # git clone https://github.com/mleich1/rqg --branch <pick the right branch> RQG
      #
      # GIT_SHOW: HEAD -> master, origin/master, origin/HEAD 24efdf20d844da7e26bf02b494515a503ef8e474 2024-01-18T19:39:19+01:00
      # rqg.pl  : Version 4.4.0 (2023-08)
      #
      # $RQG_HOME/rqg.pl \
      # --gendata=conf/mariadb/oltp.zz \
      # --max_gd_duration=900 \
      # --grammar=conf/mariadb/oltp.yy \
      # --mysqld=--transaction-isolation=REPEATABLE-READ \
      # --validator=SelectStability \
      # --mysqld=--loose-innodb_lock_schedule_algorithm=fcfs \
      # --mysqld=--loose-idle_write_transaction_timeout=0 \
      # --mysqld=--loose-idle_transaction_timeout=0 \
      # --mysqld=--loose-idle_readonly_transaction_timeout=0 \
      # --mysqld=--connect_timeout=60 \
      # --mysqld=--interactive_timeout=28800 \
      # --mysqld=--slave_net_timeout=60 \
      # --mysqld=--net_read_timeout=30 \
      # --mysqld=--net_write_timeout=60 \
      # --mysqld=--loose-table_lock_wait_timeout=50 \
      # --mysqld=--wait_timeout=28800 \
      # --no_mask \
      # --queries=10000000 \
      # --seed=random \
      # --reporters=None \
      # --reporters=ErrorLog \
      # --reporters=Deadlock \
      # --validators=None \
      # --mysqld=--log_output=none \
      # --mysqld=--log_bin_trust_function_creators=1 \
      # --mysqld=--loose-debug_assert_on_not_freed_memory=0 \
      # --engine=InnoDB \
      # --restart_timeout=240 \
      # --mysqld=--plugin-load-add=file_key_management.so \
      # --mysqld=--loose-file-key-management-filename=$RQG_HOME/conf/mariadb/encryption_keys.txt \
      # --mysqld=--plugin-load-add=provider_lzo.so \
      # --mysqld=--plugin-load-add=provider_bzip2.so \
      # --mysqld=--plugin-load-add=provider_lzma.so \
      # --mysqld=--plugin-load-add=provider_snappy.so \
      # --mysqld=--plugin-load-add=provider_lz4.so \
      # --mysqld=--loose-innodb_compression_level=1 \
      # --duration=300 \
      # --mysqld=--loose-innodb_fatal_semaphore_wait_threshold=300 \
      # --mysqld=--lock-wait-timeout=86400 \
      # --mysqld=--innodb-lock-wait-timeout=50 \    
      # --mysqld=--sql_mode=STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION \
      # --mysqld=--loose-innodb_read_only_compressed=OFF \
      # --mysqld=--innodb_stats_persistent=off \
      # --mysqld=--innodb_adaptive_hash_index=off \
      # --mysqld=--innodb_random_read_ahead=OFF \
      # --mysqld=--log-bin \
      # --mysqld=--sync-binlog=1 \
      # --mysqld=--loose-innodb_evict_tables_on_commit_debug=on \
      # --threads=33 \
      # --mysqld=--innodb_use_native_aio=1 \
      # --mysqld=--innodb_undo_log_truncate=OFF \
      # --mysqld=--loose_innodb_change_buffering=all \     # <============
      # --mysqld=--innodb_rollback_on_timeout=OFF \
      # --mysqld=--innodb_page_size=16K \
      # --mysqld=--innodb-buffer-pool-size=10M \
      # --vardir_type=slow \
      # <local settings>
      
      

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            debarun Debarun Banerjee
            mleich Matthias Leich
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              Updated:
              Resolved:

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