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Fallback to complete Memcached flush if getAllKeys fails

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Newer Memcached's do not support the underlying protocol commands that
getAllKeys() is implemented with. We should fallback to clearing
everything in that case, as causing (temporary) performance problems for
other applications on the server is better than having stale cached data.
This commit is contained in:
Robin McCorkell 2015-09-05 20:02:49 +01:00
parent f3b8634058
commit b64e3f8db6
2 changed files with 28 additions and 0 deletions
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5
lib/private/memcache/memcached.php
View file

@ -89,6 +89,11 @@ class Memcached extends Cache implements IMemcache {
public function clear($prefix = '') {
$prefix = $this->getNamespace() . $prefix;
$allKeys = self::$cache->getAllKeys();
if ($allKeys === false) {
// newer Memcached doesn't like getAllKeys(), flush everything
self::$cache->flush();
return true;
}
$keys = array();
$prefixLength = strlen($prefix);
foreach ($allKeys as $key) {

23
tests/lib/memcache/memcached.php
View file

@ -26,4 +26,27 @@ class Memcached extends Cache {
parent::setUp();
$this->instance = new \OC\Memcache\Memcached($this->getUniqueID());
}
public function testClear() {
// Memcached is sometimes broken with clear(), so we don't test it thoroughly
$value='ipsum lorum';
$this->instance->set('1_value1', $value);
$this->instance->set('1_value2', $value);
$this->instance->set('2_value1', $value);
$this->instance->set('3_value1', $value);
$this->assertTrue($this->instance->clear('1_'));
$this->assertFalse($this->instance->hasKey('1_value1'));
$this->assertFalse($this->instance->hasKey('1_value2'));
//$this->assertTrue($this->instance->hasKey('2_value1'));
//$this->assertTrue($this->instance->hasKey('3_value1'));
$this->assertTrue($this->instance->clear());
$this->assertFalse($this->instance->hasKey('1_value1'));
$this->assertFalse($this->instance->hasKey('1_value2'));
$this->assertFalse($this->instance->hasKey('2_value1'));
$this->assertFalse($this->instance->hasKey('3_value1'));
}
}