id summary reporter owner description type status priority milestone component version severity resolution keywords cc
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] => a:16:{i:1299753900;a:1:{s:22:""mmc_astroscopes_update"";a:2:{s:32:""0420685dad7e38d8c877822ab455ed11"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:2:{s:14:""feed_to_update"";N;s:9:""cache_key"";s:42:""mmc_astro_d41d8cd98f00b204e9800998ecf8427e"";}}s:32:""f34b1f61fd084a9b3d78351e7603e83e"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:2:{s:14:""feed_to_update"";s:98:""http://solutions.astrology.com/scripts/it.dll?cust_id=afv1x6&doc=daily69momscope/dailymomscope.xml"";s:9:""cache_key"";s:42:""mmc_astro_6c10ce151460e0cbc2fb83b8fba37a06"";}}}}i:1299754740;a:1:{s:13:""kb_rss_update"";a:5:{s:32:""d5ab97badfec5d705b3648bd534f0477"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:2:{s:14:""feed_to_update"";s:36:""rss_34a25eb496b7858cb5c826fd809bce48"";s:9:""widget_id"";s:17:""kb-advanced-rss-3"";}}s:32:""c3116833b112d30c6367be872b4c67d4"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:2:{s:14:""feed_to_update"";s:36:""rss_426548f3f955925809625b9c6b9b1744"";s:9:""widget_id"";s:17:""kb-advanced-rss-4"";}}s:32:""18b3055792aacef123074b9ca74dac55"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:2:{s:14:""feed_to_update"";s:36:""rss_364c7f478c7121b7bb621aa7fa8403a3"";s:9:""widget_id"";s:17:""kb-advanced-rss-5"";}}s:32:""5a4a08925ea65721b5a23699ac97773d"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:2:{s:14:""feed_to_update"";s:36:""rss_0306f5e9f102f025bce58c6c822c3be4"";s:9:""widget_id"";s:17:""kb-advanced-rss-6"";}}s:32:""eaf0bd348c10a2fd06a3acad91b7ee4c"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:2:{s:14:""feed_to_update"";s:36:""rss_2a495aedf333c5736fe131abe87cd0a7"";s:9:""widget_id"";s:17:""kb-advanced-rss-7"";}}}}i:1299754750;a:1:{s:25:""w3_cdn_cron_queue_process"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:3:{s:8:""schedule"";s:25:""w3_cdn_cron_queue_process"";s:4:""args"";a:0:{}s:8:""interval"";i:900;}}}i:1299759120;a:5:{s:23:""celebritytwitter_update"";a:1:{s:32:""6e522efa368959102e2dd6b4f22e1909"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:1:{s:14:""feed_to_update"";s:29:""http://giantredcarpet.com/rss"";}}}s:20:""hollywoodlife_update"";a:1:{s:32:""5ba39041bb096595e23e3c2119691d00"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:1:{s:14:""feed_to_update"";s:34:""http://www.hollywoodlife.com/feed/"";}}}s:20:""entertainment_update"";a:1:{s:32:""301d48ec2a9f4b36afdcd220426071ad"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:1:{s:14:""feed_to_update"";s:57:""http://feeds.feedburner.com/cafemom/thestir/entertainment"";}}}s:25:""celebritybabyscoop_update"";a:1:{s:32:""d6f57fa14ee72b7fdb6e1ee0d8fd72c5"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:1:{s:14:""feed_to_update"";s:41:""http://www.celebritybabyscoop.com/rss.xml"";}}}s:10:""TMZ_update"";a:1:{s:32:""5fae3b7313fbde8e0fa9608814e4a60b"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:1:{s:14:""feed_to_update"";s:26:""http://www.tmz.com/rss.xml"";}}}}i:1299760706;a:1:{s:19:""wp_scheduled_delete"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:3:{s:8:""schedule"";s:5:""daily"";s:4:""args"";a:0:{}s:8:""interval"";i:86400;}}}i:1299788066;a:1:{s:16:""wp_update_themes"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:3:{s:8:""schedule"";s:10:""twicedaily"";s:4:""args"";a:0:{}s:8:""interval"";i:43200;}}}i:1299788076;a:2:{s:16:""wp_version_check"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:3:{s:8:""schedule"";s:10:""twicedaily"";s:4:""args"";a:0:{}s:8:""interval"";i:43200;}}s:17:""wp_update_plugins"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:3:{s:8:""schedule"";s:10:""twicedaily"";s:4:""args"";a:0:{}s:8:""interval"";i:43200;}}}i:1299839463;a:1:{s:24:""akismet_scheduled_delete"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:3:{s:8:""schedule"";s:5:""daily"";s:4:""args"";a:0:{}s:8:""interval"";i:86400;}}}i:1300356860;a:1:{s:8:""do_pings"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:0:{}}}}i:1300356900;a:1:{s:28:""generate_google_news_sitemap"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:0:{}}}}i:1305886446;a:1:{s:14:""test_entry_A_1"";a:1:{s:32:""6a0516caf3ce51275a89301665b122f0"";a:3:{s:8:""schedule"";s:5:""daily"";s:4:""args"";a:1:{i:0;s:3:""A_1"";}s:8:""interval"";i:86400;}}}i:1305887119;a:1:{s:14:""test_entry_A_2"";a:1:{s:32:""aa36d3b4b4b434079a14acfb78ee17f7"";a:3:{s:8:""schedule"";s:5:""daily"";s:4:""args"";a:1:{i:0;s:3:""A_2"";}s:8:""interval"";i:86400;}}}i:1305887137;a:1:{s:14:""test_entry_A_3"";a:1:{s:32:""a27438b84df31de69f5733f8d5158b3b"";a:3:{s:8:""schedule"";s:5:""daily"";s:4:""args"";a:1:{i:0;s:3:""A_3"";}s:8:""interval"";i:86400;}}}i:1305887141;a:1:{s:14:""test_entry_A_4"";a:1:{s:32:""2111368a27f704830c3a4e2059d14023"";a:3:{s:8:""schedule"";s:5:""daily"";s:4:""args"";a:1:{i:0;s:3:""A_4"";}s:8:""interval"";i:86400;}}}i:1305887151;a:1:{s:14:""test_entry_A_5"";a:1:{s:32:""7aa257bc988cc2f7a581b9dc514aa758"";a:3:{s:8:""schedule"";s:5:""daily"";s:4:""args"";a:1:{i:0;s:3:""A_5"";}s:8:""interval"";i:86400;}}}s:7:""version"";i:2;}
[autoload] => yes
)
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After Update-----------------------------------
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[blog_id] => 0
[option_name] => cron
[option_value] => a:16:{i:1299753900;a:1:{s:22:""mmc_astroscopes_update"";a:2:{s:32:""0420685dad7e38d8c877822ab455ed11"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:2:{s:14:""feed_to_update"";N;s:9:""cache_key"";s:42:""mmc_astro_d41d8cd98f00b204e9800998ecf8427e"";}}s:32:""f34b1f61fd084a9b3d78351e7603e83e"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:2:{s:14:""feed_to_update"";s:98:""http://solutions.astrology.com/scripts/it.dll?cust_id=afv1x6&doc=daily69momscope/dailymomscope.xml"";s:9:""cache_key"";s:42:""mmc_astro_6c10ce151460e0cbc2fb83b8fba37a06"";}}}}i:1299754740;a:1:{s:13:""kb_rss_update"";a:5:{s:32:""d5ab97badfec5d705b3648bd534f0477"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:2:{s:14:""feed_to_update"";s:36:""rss_34a25eb496b7858cb5c826fd809bce48"";s:9:""widget_id"";s:17:""kb-advanced-rss-3"";}}s:32:""c3116833b112d30c6367be872b4c67d4"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:2:{s:14:""feed_to_update"";s:36:""rss_426548f3f955925809625b9c6b9b1744"";s:9:""widget_id"";s:17:""kb-advanced-rss-4"";}}s:32:""18b3055792aacef123074b9ca74dac55"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:2:{s:14:""feed_to_update"";s:36:""rss_364c7f478c7121b7bb621aa7fa8403a3"";s:9:""widget_id"";s:17:""kb-advanced-rss-5"";}}s:32:""5a4a08925ea65721b5a23699ac97773d"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:2:{s:14:""feed_to_update"";s:36:""rss_0306f5e9f102f025bce58c6c822c3be4"";s:9:""widget_id"";s:17:""kb-advanced-rss-6"";}}s:32:""eaf0bd348c10a2fd06a3acad91b7ee4c"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:2:{s:14:""feed_to_update"";s:36:""rss_2a495aedf333c5736fe131abe87cd0a7"";s:9:""widget_id"";s:17:""kb-advanced-rss-7"";}}}}i:1299754750;a:1:{s:25:""w3_cdn_cron_queue_process"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:3:{s:8:""schedule"";s:25:""w3_cdn_cron_queue_process"";s:4:""args"";a:0:{}s:8:""interval"";i:900;}}}i:1299759120;a:5:{s:23:""celebritytwitter_update"";a:1:{s:32:""6e522efa368959102e2dd6b4f22e1909"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:1:{s:14:""feed_to_update"";s:29:""http://giantredcarpet.com/rss"";}}}s:20:""hollywoodlife_update"";a:1:{s:32:""5ba39041bb096595e23e3c2119691d00"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:1:{s:14:""feed_to_update"";s:34:""http://www.hollywoodlife.com/feed/"";}}}s:20:""entertainment_update"";a:1:{s:32:""301d48ec2a9f4b36afdcd220426071ad"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:1:{s:14:""feed_to_update"";s:57:""http://feeds.feedburner.com/cafemom/thestir/entertainment"";}}}s:25:""celebritybabyscoop_update"";a:1:{s:32:""d6f57fa14ee72b7fdb6e1ee0d8fd72c5"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:1:{s:14:""feed_to_update"";s:41:""http://www.celebritybabyscoop.com/rss.xml"";}}}s:10:""TMZ_update"";a:1:{s:32:""5fae3b7313fbde8e0fa9608814e4a60b"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:1:{s:14:""feed_to_update"";s:26:""http://www.tmz.com/rss.xml"";}}}}i:1299760706;a:1:{s:19:""wp_scheduled_delete"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:3:{s:8:""schedule"";s:5:""daily"";s:4:""args"";a:0:{}s:8:""interval"";i:86400;}}}i:1299788066;a:1:{s:16:""wp_update_themes"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:3:{s:8:""schedule"";s:10:""twicedaily"";s:4:""args"";a:0:{}s:8:""interval"";i:43200;}}}i:1299788076;a:2:{s:16:""wp_version_check"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:3:{s:8:""schedule"";s:10:""twicedaily"";s:4:""args"";a:0:{}s:8:""interval"";i:43200;}}s:17:""wp_update_plugins"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:3:{s:8:""schedule"";s:10:""twicedaily"";s:4:""args"";a:0:{}s:8:""interval"";i:43200;}}}i:1299839463;a:1:{s:24:""akismet_scheduled_delete"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:3:{s:8:""schedule"";s:5:""daily"";s:4:""args"";a:0:{}s:8:""interval"";i:86400;}}}i:1300356860;a:1:{s:8:""do_pings"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:0:{}}}}i:1300356900;a:1:{s:28:""generate_google_news_sitemap"";a:1:{s:32:""40cd750bba9870f18aada2478b24840a"";a:2:{s:8:""schedule"";b:0;s:4:""args"";a:0:{}}}}i:1305886446;a:1:{s:14:""test_entry_A_1"";a:1:{s:32:""6a0516caf3ce51275a89301665b122f0"";a:3:{s:8:""schedule"";s:5:""daily"";s:4:""args"";a:1:{i:0;s:3:""A_1"";}s:8:""interval"";i:86400;}}}i:1305887119;a:1:{s:14:""test_entry_A_2"";a:1:{s:32:""aa36d3b4b4b434079a14acfb78ee17f7"";a:3:{s:8:""schedule"";s:5:""daily"";s:4:""args"";a:1:{i:0;s:3:""A_2"";}s:8:""interval"";i:86400;}}}i:1305887137;a:1:{s:14:""test_entry_A_3"";a:1:{s:32:""a27438b84df31de69f5733f8d5158b3b"";a:3:{s:8:""schedule"";s:5:""daily"";s:4:""args"";a:1:{i:0;s:3:""A_3"";}s:8:""interval"";i:86400;}}}i:1305887141;a:1:{s:14:""test_entry_A_4"";a:1:{s:32:""2111368a27f704830c3a4e2059d14023"";a:3:{s:8:""schedule"";s:5:""daily"";s:4:""args"";a:1:{i:0;s:3:""A_4"";}s:8:""interval"";i:86400;}}}i:1305887156;a:1:{s:14:""test_entry_A_6"";a:1:{s:32:""2c64bb51f72127dffabb04230ee37104"";a:3:{s:8:""schedule"";s:5:""daily"";s:4:""args"";a:1:{i:0;s:3:""A_6"";}s:8:""interval"";i:86400;}}}s:7:""version"";i:2;}
[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