Zend Framework

• Type: Patch
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.10.4
• Fix Version/s: 1.10.8
• Component/s: Zend_Cache
• Labels:

  None

I'm trying to use TwoLevels cache backend in cache for DB metadata. I'm using default slow and fast backends (File and Apc). Here is a sample of code:

$cache = Zend_Cache::factory(
'Core',
'TwoLevels',
array(
'automatic_serialization' => true,
'lifetime' => 86400
),
array(
'slow_backend_options' => array(
'cache_dir' => '/www/cludisc/tmp/tp_cache/dbmetadata'
)
),
false,
true
);
$table = new TableClass(array(
'db' => $db,
'metadataCache' => $cache
));
echo $table->find(123456)>current()>ID;

By first running when metadata isn't cached I get a notice "Failed saving metadata to metadataCache". I think a cause of this notice may be in Zend_Cache_Backend_TwoLevels->save() method. When usage of fast backend is too high and data is saved by a slow backend only there is a try to remove this data from fast backend (line 203 in Zend/Cache/Backend/TwoLevels.php). When Apc backend is used as fast one apc_delete() function is called in this case (line 127 in Zend/Cache/Backend/Apc.php). But there could be cases in which this data isn't in fast backend. In this case apc_delete() returns FALSE and save() method of metadata cache returns FALSE too as a result (line 825 in Zend/Db/Table/Abstract.php). It causes generating a notice at the next line. As a solution of this problem the following patch for Zend/Cache/Backend/Apc.php may be used:

127c127,132
< return apc_delete($id);
—
> $removableData = apc_fetch($id);
> if ($removableData) { > return apc_delete($id); > } else { > return true; > }

1. 

   Apc.php.patch

   18/May/10 10:42 PM

   0.2 kB

   Authenticus Nomen

• Assignee:

  Andy Fowler

  Reporter:

  Authenticus Nomen

• Created:

  18/May/10 8:37 AM

  Updated:

  30/Jul/10 9:32 AM

  Resolved:

  30/Jul/10 9:32 AM