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  1. MariaDB Server
  2. MDEV-24378

Crashes on Semaphore wait > 600 seconds

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    Description

      Since upgrading to 10.4.17 we have been getting long semaphore waits which frequently result in a crash. Sometimes they resolve before a crash, but still cause lots of other lock wait timeouts or other related problems.

      The most frequent latches referenced are in btr0cur.cc and dict0dict.cc.

      We have 4 production and 4 staging servers, each with different workloads, and we have seen these errors on at least 3 of the production servers and 2 of the staging servers. The tendency is for it to happen during high write load but it has happened when load was fairly low.

      It has occurred at least 8 times in our production cluster since the upgrade to 10.4.17 which we installed on 2020/11/21. Prior to the upgrade to 10.4.17 we had been on 10.4.14. That version had been having unexplained crashes, following a similar pattern, but we were not getting the semaphore wait warnings in our logs. Those had started with the 10.4.14 upgrade but without any ability to reproduce, and no significant log messages, we had not filed a bug report on it yet. I suspect that it was the same issue, but don't know how to test that theory.

      InnoDB: ###### Diagnostic info printed to the standard error stream
      2020-12-09  9:55:45 0 [ERROR] [FATAL] InnoDB: Semaphore wait has lasted > 600 seconds. We intentionally crash the server because it appears to be hung.
      201209  9:55:45 [ERROR] mysqld got signal 6 ;
      This could be because you hit a bug. It is also possible that this binary
      or one of the libraries it was linked against is corrupt, improperly built,
      or misconfigured. This error can also be caused by malfunctioning hardware.
       
      To report this bug, see https://mariadb.com/kb/en/reporting-bugs
       
      We will try our best to scrape up some info that will hopefully help
      diagnose the problem, but since we have already crashed, 
      something is definitely wrong and this may fail.
       
      Server version: 10.4.17-MariaDB-log
      key_buffer_size=31457280
      read_buffer_size=131072
      max_used_connections=152
      max_threads=4002
      thread_count=161
      It is possible that mysqld could use up to 
      key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 8837909 K  bytes of memory
      Hope that's ok; if not, decrease some variables in the equation.
       
      Thread pointer: 0x0
      Attempting backtrace. You can use the following information to find out
      where mysqld died. If you see no messages after this, something went
      terribly wrong...
      stack_bottom = 0x0 thread_stack 0x49000
      /usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x560adb3d04ae]
      /usr/sbin/mysqld(handle_fatal_signal+0x30f)[0x560adae63e1f]
      /lib64/libpthread.so.0(+0xf600)[0x7feabd373600]
      /lib64/libc.so.6(gsignal+0x37)[0x7feabb89c3a7]
      /lib64/libc.so.6(abort+0x148)[0x7feabb89da98]
      /usr/sbin/mysqld(+0xc1bd60)[0x560adb159d60]
      /usr/sbin/mysqld(+0xbd4232)[0x560adb112232]
      /lib64/libpthread.so.0(+0x7e75)[0x7feabd36be75]
      /lib64/libc.so.6(clone+0x6d)[0x7feabb9648fd]
      The manual page at https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mysqld/ contains
      information that should help you find out what is causing the crash.
      Writing a core file...
      

      There are warnings with INNODB monitor output numerous times preceding the crash. The number of open queries getting stuck gets quite long as it approaches the crash so I figure the one most likely to be helpful is the earliest one. I have censored the query strings due to sensitive data.

      InnoDB: ###### Starts InnoDB Monitor for 30 secs to print diagnostic info:
      InnoDB: Pending reads 0, writes 0
       
      =====================================
      2020-12-09 09:43:53 0x7fe4bcbfc700 INNODB MONITOR OUTPUT
      =====================================
      Per second averages calculated from the last 60 seconds
      -----------------
      BACKGROUND THREAD
      -----------------
      srv_master_thread loops: 102524 srv_active, 0 srv_shutdown, 221160 srv_idle
      srv_master_thread log flush and writes: 323650
      ----------
      SEMAPHORES
      ----------
      OS WAIT ARRAY INFO: reservation count 3217156
      --Thread 140620618213120 has waited at buf0flu.cc line 1176 for 241.00 seconds the semaphore:
      SX-lock on RW-latch at 0x7fe6e6989208 created in file buf0buf.cc line 1568
      a writer (thread id 140620299949824) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: e0000000
      Last time write locked in file btr0cur.cc line 2417
      --Thread 140620387563264 has waited at fsp0fsp.cc line 1984 for 227.00 seconds the semaphore:
      X-lock on RW-latch at 0x7fe4a280aec0 created in file fil0fil.cc line 1266
      a writer (thread id 140620299949824) has reserved it in mode  exclusive
      number of readers 0, waiters flag 1, lock_word: dfffffff
      Last time write locked in file fsp0fsp.cc line 2402
      OS WAIT ARRAY INFO: signal count 22529095
      RW-shared spins 41276936, rounds 128593064, OS waits 1031233
      RW-excl spins 27792813, rounds 117073205, OS waits 1025437
      RW-sx spins 1932526, rounds 13959835, OS waits 165716
      Spin rounds per wait: 3.12 RW-shared, 4.21 RW-excl, 7.22 RW-sx
      ------------
      TRANSACTIONS
      ------------
      Trx id counter 17462604867
      Purge done for trx's n:o < 17462603855 undo n:o < 0 state: running
      History list length 487
      LIST OF TRANSACTIONS FOR EACH SESSION:
      ---TRANSACTION 17462604866, ACTIVE 67 sec setting auto-inc lock
      mysql tables in use 1, locked 1
      LOCK WAIT 1 lock struct(s), heap size 1128, 0 row lock(s)
      MySQL thread id 18649, OS thread handle 140620601120512, query id 777866038 172.31.66.100 dbworkerfactorysecure Executing
      INSERT INTO ******
      ------- TRX HAS BEEN WAITING 67 SEC FOR THIS LOCK TO BE GRANTED:
      TABLE LOCK table `leanload_landingzone`.`database_action_log` trx id 17462604866 lock mode AUTO-INC waiting
      ------------------
      ---TRANSACTION 17462604865, ACTIVE 144 sec inserting
      mysql tables in use 1, locked 1
      2 lock struct(s), heap size 1128, 0 row lock(s)
      MySQL thread id 18646, OS thread handle 140619220154112, query id 777865925 172.31.66.223 dbworkerfactorysecure Executing
      INSERT INTO ******
      ---TRANSACTION 422120853290824, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853286568, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 17462604837, ACTIVE 234 sec inserting
      mysql tables in use 19, locked 13
      2 lock struct(s), heap size 1128, 0 row lock(s), undo log entries 203216
      MySQL thread id 18631, OS thread handle 140619223607040, query id 777476378 172.31.66.68 dbworkerfactorysecure Creating sort index
      INSERT *****
      Trx read view will not see trx with id >= 17462604819, sees < 17462603853
      ---TRANSACTION 17462603853, ACTIVE 325 sec inserting
      mysql tables in use 5, locked 2
      2 lock struct(s), heap size 1128, 0 row lock(s), undo log entries 3713879
      MySQL thread id 18627, OS thread handle 140620299949824, query id 777462590 172.31.66.142 dbworkerfactorysecure Sending data
      INSERT INTO ****
      Trx read view will not see trx with id >= 17462603853, sees < 17462603853
      ---TRANSACTION 422120853273800, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853269544, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853265288, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853261032, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853167400, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853256776, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853252520, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853248264, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853244008, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853239752, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853235496, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853231240, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853226984, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853222728, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853218472, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853214216, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853209960, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853205704, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853201448, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853197192, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853192936, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853188680, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853184424, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853180168, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853175912, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853171656, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853163144, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853158888, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853154632, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853150376, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853146120, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853141864, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853137608, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853133352, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853129096, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853124840, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853120584, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853116328, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853112072, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853107816, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853103560, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853099304, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853095048, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 422120853090792, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      ---TRANSACTION 17462604858, ACTIVE 220 sec inserting
      mysql tables in use 1, locked 1
      3 lock struct(s), heap size 1128, 1 row lock(s), undo log entries 1
      MySQL thread id 10, OS thread handle 140646178735872, query id 777865730
      ---TRANSACTION 422120853082280, not started
      0 lock struct(s), heap size 1128, 0 row lock(s)
      --------
      FILE I/O
      --------
      I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
      I/O thread 1 state: waiting for completed aio requests (log thread)
      I/O thread 2 state: waiting for completed aio requests (read thread)
      I/O thread 3 state: waiting for completed aio requests (read thread)
      I/O thread 4 state: waiting for completed aio requests (read thread)
      I/O thread 5 state: waiting for completed aio requests (read thread)
      I/O thread 6 state: waiting for completed aio requests (write thread)
      I/O thread 7 state: waiting for completed aio requests (write thread)
      I/O thread 8 state: waiting for completed aio requests (write thread)
      I/O thread 9 state: waiting for completed aio requests (write thread)
      Pending normal aio reads: [0, 0, 0, 0] , aio writes: [0, 0, 0, 0] ,
       ibuf aio reads:, log i/o's:, sync i/o's:
      Pending flushes (fsync) log: 0; buffer pool: 0
      24188890 OS file reads, 29232470 OS file writes, 4530146 OS fsyncs
      0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
      -------------------------------------
      INSERT BUFFER AND ADAPTIVE HASH INDEX
      -------------------------------------
      Ibuf: size 1, free list len 209942, seg size 209944, 1509741 merges
      merged operations:
       insert 3862925, delete mark 11675526, delete 1201855
      discarded operations:
       insert 0, delete mark 0, delete 0
      Hash table size 5843809, node heap has 3791 buffer(s)
      Hash table size 5843809, node heap has 5577 buffer(s)
      Hash table size 5843809, node heap has 3297 buffer(s)
      Hash table size 5843809, node heap has 5687 buffer(s)
      Hash table size 5843809, node heap has 3953 buffer(s)
      Hash table size 5843809, node heap has 7772 buffer(s)
      Hash table size 5843809, node heap has 18181 buffer(s)
      Hash table size 5843809, node heap has 10925 buffer(s)
      7.32 hash searches/s, 2.65 non-hash searches/s
      ---
      LOG
      ---
      Log sequence number 102422876480104
      Log flushed up to   102422876480104
      Pages flushed up to 102422800703925
      Last checkpoint at  102422800703925
      0 pending log flushes, 0 pending chkp writes
      1642503 log i/o's done, 0.00 log i/o's/second
      ----------------------
      BUFFER POOL AND MEMORY
      ----------------------
      Total large memory allocated 23655874560
      Dictionary memory allocated 4009296
      Buffer pool size   1412752
      Free buffers       4632
      Database pages     1348936
      Old database pages 497782
      Modified db pages  5220
      Percent of dirty pages(LRU & free pages): 0.386
      Max dirty pages percent: 75.000
      Pending reads 0
      Pending writes: LRU 0, flush list 2, single page 0
      Pages made young 12285071, not young 736294742
      0.00 youngs/s, 0.00 non-youngs/s
      Pages read 24091045, created 6416261, written 26204033
      0.00 reads/s, 0.00 creates/s, 0.00 writes/s
      Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
      Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
      LRU len: 1348936, unzip_LRU len: 0
      I/O sum[0]:cur[0], unzip sum[0]:cur[0]
      ----------------------
      INDIVIDUAL BUFFER POOL INFO
      ----------------------
      ---BUFFER POOL 0
      Buffer pool size   176594
      Free buffers       575
      Database pages     168645
      Old database pages 62233
      Modified db pages  825
      Percent of dirty pages(LRU & free pages): 0.488
      Max dirty pages percent: 75.000
      Pending reads 0
      Pending writes: LRU 0, flush list 0, single page 0
      Pages made young 1530158, not young 89652355
      0.00 youngs/s, 0.00 non-youngs/s
      Pages read 3000704, created 820651, written 4459033
      0.00 reads/s, 0.00 creates/s, 0.00 writes/s
      Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
      Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
      LRU len: 168645, unzip_LRU len: 0
      I/O sum[0]:cur[0], unzip sum[0]:cur[0]
      ---BUFFER POOL 1
      Buffer pool size   176594
      Free buffers       546
      Database pages     168545
      Old database pages 62196
      Modified db pages  661
      Percent of dirty pages(LRU & free pages): 0.391
      Max dirty pages percent: 75.000
      Pending reads 0
      Pending writes: LRU 0, flush list 0, single page 0
      Pages made young 1548223, not young 93971088
      0.00 youngs/s, 0.00 non-youngs/s
      Pages read 3064144, created 797585, written 2957721
      0.00 reads/s, 0.00 creates/s, 0.00 writes/s
      Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
      Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
      LRU len: 168545, unzip_LRU len: 0
      I/O sum[0]:cur[0], unzip sum[0]:cur[0]
      ---BUFFER POOL 2
      Buffer pool size   176594
      Free buffers       621
      Database pages     168578
      Old database pages 62208
      Modified db pages  608
      Percent of dirty pages(LRU & free pages): 0.359
      Max dirty pages percent: 75.000
      Pending reads 0
      Pending writes: LRU 0, flush list 0, single page 0
      Pages made young 1553285, not young 91180805
      0.00 youngs/s, 0.00 non-youngs/s
      Pages read 3023249, created 801831, written 2881988
      0.00 reads/s, 0.00 creates/s, 0.00 writes/s
      Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
      Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
      LRU len: 168578, unzip_LRU len: 0
      I/O sum[0]:cur[0], unzip sum[0]:cur[0]
      ---BUFFER POOL 3
      Buffer pool size   176594
      Free buffers       623
      Database pages     168501
      Old database pages 62180
      Modified db pages  621
      Percent of dirty pages(LRU & free pages): 0.367
      Max dirty pages percent: 75.000
      Pending reads 0
      Pending writes: LRU 0, flush list 0, single page 0
      Pages made young 1544401, not young 92782155
      0.00 youngs/s, 0.00 non-youngs/s
      Pages read 3055426, created 798407, written 3548916
      0.00 reads/s, 0.00 creates/s, 0.00 writes/s
      Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
      Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
      LRU len: 168501, unzip_LRU len: 0
      I/O sum[0]:cur[0], unzip sum[0]:cur[0]
      ---BUFFER POOL 4
      Buffer pool size   176594
      Free buffers       570
      Database pages     168653
      Old database pages 62236
      Modified db pages  605
      Percent of dirty pages(LRU & free pages): 0.358
      Max dirty pages percent: 75.000
      Pending reads 0
      Pending writes: LRU 0, flush list 0, single page 0
      Pages made young 1530555, not young 93768585
      0.00 youngs/s, 0.00 non-youngs/s
      Pages read 3023945, created 798087, written 3336562
      0.00 reads/s, 0.00 creates/s, 0.00 writes/s
      Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
      Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
      LRU len: 168653, unzip_LRU len: 0
      I/O sum[0]:cur[0], unzip sum[0]:cur[0]
      ---BUFFER POOL 5
      Buffer pool size   176594
      Free buffers       530
      Database pages     168808
      Old database pages 62293
      Modified db pages  641
      Percent of dirty pages(LRU & free pages): 0.379
      Max dirty pages percent: 75.000
      Pending reads 0
      Pending writes: LRU 0, flush list 2, single page 0
      Pages made young 1547158, not young 91440491
      0.00 youngs/s, 0.00 non-youngs/s
      Pages read 2993753, created 800748, written 2959769
      0.00 reads/s, 0.00 creates/s, 0.00 writes/s
      Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
      Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
      LRU len: 168808, unzip_LRU len: 0
      I/O sum[0]:cur[0], unzip sum[0]:cur[0]
      ---BUFFER POOL 6
      Buffer pool size   176594
      Free buffers       537
      Database pages     168617
      Old database pages 62223
      Modified db pages  636
      Percent of dirty pages(LRU & free pages): 0.376
      Max dirty pages percent: 75.000
      Pending reads 0
      Pending writes: LRU 0, flush list 0, single page 0
      Pages made young 1514961, not young 89712669
      0.00 youngs/s, 0.00 non-youngs/s
      Pages read 2978655, created 800363, written 2979454
      0.00 reads/s, 0.00 creates/s, 0.00 writes/s
      Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
      Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
      LRU len: 168617, unzip_LRU len: 0
      I/O sum[0]:cur[0], unzip sum[0]:cur[0]
      ---BUFFER POOL 7
      Buffer pool size   176594
      Free buffers       630
      Database pages     168589
      Old database pages 62213
      Modified db pages  623
      Percent of dirty pages(LRU & free pages): 0.368
      Max dirty pages percent: 75.000
      Pending reads 0
      Pending writes: LRU 0, flush list 0, single page 0
      Pages made young 1516330, not young 93786594
      0.00 youngs/s, 0.00 non-youngs/s
      Pages read 2951169, created 798589, written 3080590
      0.00 reads/s, 0.00 creates/s, 0.00 writes/s
      Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
      Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
      LRU len: 168589, unzip_LRU len: 0
      I/O sum[0]:cur[0], unzip sum[0]:cur[0]
      --------------
      ROW OPERATIONS
      --------------
      0 queries inside InnoDB, 0 queries in queue
      2 read views open inside InnoDB
      Process ID=2563, Main thread ID=140620421134080, state: sleeping
      Number of rows inserted 291442737, updated 43530027, deleted 16560971, read 18102275991
      0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 21.62 reads/s
      Number of system rows inserted 839287, updated 0, deleted 839231, read 839237
      0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
      ----------------------------
      END OF INNODB MONITOR OUTPUT
      ============================
      

      Potentially related issues?
      https://jira.mariadb.org/browse/MDEV-24142
      https://jira.mariadb.org/browse/MDEV-24225

      Attachments

        1. gdb-thread-apply-all-bt.txt.gz
          161 kB
        2. mariadb_10417.37345.3.gdb.bt
          38 kB
        3. mariadb_10417.37345.3.gdb.bt-full
          127 kB
        4. maria-sem.txt
          10 kB
        5. MDEV-24378.perf.tgz
          417 kB
        6. normal-load.perf.script.svg
          294 kB
        7. oc_1_innodb.txt
          11 kB
        8. oc_1_threads.txt
          49 kB
        9. read-spike.perf.script.svg
          99 kB
        10. SEIS.dict0stats.out
          6 kB

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              marko Marko Mäkelä
              jacob.williams Jacob Williams
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                Updated:
                Resolved:

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