id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,focuses 17519,With Persistent Caching get_option returns old values of option despite update,vickybiswas,,"We use wordpress 3.x on different installations for our high traffic sites. We use persistent caching using W3 Total Cache object cache which is set to read from our memcached servers Intermittently we noticed cron set but not running, options set but not returning the right value On digging deeper we found that when concurrent pages are loading a race condition existed which over wrote the new values with old values. Screen shot attached will display what we mean here. We created a test page which did the following 1. read option value from db 2. dump the object from step 1 3. get_option 4. display value received in step 3 5. update option 6. get_option 7. display value received in step 7 8. read option value from db 9. dump the object from step 8 10. Stop The output in the screenshot shows that get option was returning a cached copy of the option although the db contained a later value. '''Way to recreate using above algo''' ''Platform'' WP ver 3.x with W3 Total Cache ''Settings'' W3 Total Cache object caching on using memcache servers ''Code'' {{{ ""); require_once(""wp-load.php""); $countNumDB = show_db_values(); $countNumDB++; $countNum = show_go_values(); if ($countNum==0) update_option(""mmc_test_entry_a"", 1); update_option(""mmc_test_entry_a"",$countNumDB); print(""After Update-----------------------------------
""); show_go_values(); show_db_values(); sleep(2); //Fetch and Display option Value using DB function show_db_values() { global $wpdb; $oRS = $wpdb->get_row(""SELECT * FROM wp_options WHERE option_name='mmc_test_entry_a'""); print(""
\n"");
  print_r($oRS);
  print(""

\n""); return intval($oRS->option_value); } //Fetch and Display option Value using get_option function show_go_values() { $countNum = intval(get_option(""mmc_test_entry_a"")); print('@ ' . time() . ""get_option shows -> {$countNum}
""); return intval($countNum); } }}} Open this page in 4 windows and refresh these page consecutively a few times you would notice mismatch in db and fetch values like the second screenshot which shows the db reflecting 9 get option fetches 7 after update both show 10 but parallely if we open this in another widow we would still get 7 using get_option We did a similar script for testing cron with similar results {{{ Starting script stdClass Object ( [option_id] => 96 [blog_id] => 0 [option_name] => cron [option_value] => 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[autoload] => yes ) }}} If you notice the cron finally contained A_6 and A_5 was lost as if it never existed in the cron. '''Solution''' We used a temporary solution as follows {{{ add_action( 'pre_option_cron', 'mmc_pre_option_cron',10 ); wp_schedule_event($new_timestamp,$recurrence,$hook,$args); remove_action( 'pre_option_cron', 'mmc_pre_option_cron',10 ); /** * Clean Cron Values from cache so that fresh is fetched * * @since 2011-04-18 Vicky Biswas */ function mmc_pre_option_cron (){ $alloptions = wp_load_alloptions(); if ( isset( $alloptions['cron'] ) ) { unset ($alloptions['cron']); wp_cache_set( 'alloptions', $alloptions, 'options' ); } else wp_cache_delete( 'cron', 'options' ); return false; } }}} We invalidated the cache for cron when we needed to set the value. So that it reads from the db and updates. Still Looking for a permanent Solution not sure despite updating the object cache why get_option returns old value.",defect (bug),closed,normal,,General,,normal,invalid,,,