Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
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5.3.12, 5.5, 10.0, 10.1, 10.2, 10.3, 10.4
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None
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10.0.20
Description
hi guys, i'm running a stress test with query cache and aria...
the table:
CREATE TABLE `errors` (
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`id1` INT(11) NOT NULL DEFAULT '0',
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`id2` INT(11) NOT NULL DEFAULT '0',
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`err_id` INT(11) NOT NULL DEFAULT '0',
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`datahora` DECIMAL(22,7) NOT NULL DEFAULT '0.0000000',
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`erro` LONGBLOB NOT NULL,
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PRIMARY KEY (`id1`, `id2`, `err_id`)
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)
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COLLATE='latin1_swedish_ci'
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ENGINE=Aria;
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(using page table type!)
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i startup a php script:
<?php
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$pid=pcntl_fork();
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if($pid==0) $pid=pcntl_fork();
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if($pid==0) $pid=pcntl_fork();
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// three different process
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// connect to database
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$conn=mysql_connect(/* connection parameters */);
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mysql_select_db(/*select database*/);
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// and start a infinite loop
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$contador=0;
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while(1){
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$SQL= "SELECT MAX(err_id) FROM errors ".
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"WHERE id1=1 AND id2=2";
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IF($contador%1000==0 && $contador>1000) echo "\n$SQL\n";
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$tmp_tbl=mysql_query($SQL);
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$err_id=mysql_result($tmp_tbl,0,0);
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IF($contador%1000==0 && $contador>1000) echo "\n$err_id\n";
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mysql_free($tmp_tbl);
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$err_id++;if($err_id<=0) $err_id=1;
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$SQL= "INSERT INTO errors (".
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"id1,id2,err_id,datahora,erro".
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") VALUES (".
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"1,2,$err_id,'".microtime(1)."','test '".
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")";
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$ok=mysql_query($SQL); /* autocommit = 1 */
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if($ok){
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$contador=0;
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continue;
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}
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$contador++;
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usleep(500); // wait a bit...
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}
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aria variables:
| Variable_name | Value |
|---|---|
| aria_block_size | 8192 |
| aria_checkpoint_interval | 30 |
| aria_checkpoint_log_activity | 1048576 |
| aria_force_start_after_recovery_failures | 0 |
| aria_group_commit | none |
| aria_group_commit_interval | 0 |
| aria_log_file_size | 1073741824 |
| aria_log_purge_type | immediate |
| aria_max_sort_file_size | 9223372036853727232 |
| aria_page_checksum | ON |
| aria_pagecache_age_threshold | 300 |
| aria_pagecache_buffer_size | 134217728 |
| aria_pagecache_division_limit | 100 |
| aria_recover | NORMAL |
| aria_repair_threads | 1 |
| aria_sort_buffer_size | 268434432 |
| aria_stats_method | nulls_unequal |
| aria_sync_log_dir | NEWFILE |
| aria_used_for_temp_tables | ON |
autocommit=1
concurrent_insert isn't a problem, i tested with 0,1,2 this give the same error
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what i think is happen?
at query cache code there's a consideration about when or when not include the query at query cache, while a insert and another aria table is invalidated and a "select" query execute:
time ->
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-----INSERT-------
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---SELECCCCCCT--- (cached after invalidation - shoudn't be cached)
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---------------------SELECT ---- (got from query cache, wrong query cache value)
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the value of the new insert field err_id isn't updated at the right time, in other words when i connect with a externall tool and set autocommit=0 (to get a different query cache flag, or use SQL_NO_CACHE) i see that the err_id is different from err_id of php script
in other words
1)the table wasn't invalidated correctly
2)the query was cached in a state that aria engine should report to don't cache (concurrent insert? page flush? anything like a buffer or cache being used while updating table?)
could we recheck if the aria engine invalidation is ok or not?
i will test again with myisam, and after innodb
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no problem with innodb
no problem with myisam
no problem with aria using row_format fixed/dynamic, only with aria-page
Attachments
Issue Links
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- Closed
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