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[Cache] Improve RedisTagAwareAdapter invalidation logic & requirements #33461

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Oct 8, 2019
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[Cache] Improve RedisTagAwareAdapter invalidation logic & requirements #33461

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117 changes: 67 additions & 50 deletions src/Symfony/Component/Cache/Adapter/RedisTagAwareAdapter.php
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Original file line number Diff line number Diff line change
Expand Up @@ -11,33 +11,32 @@

namespace Symfony\Component\Cache\Adapter;

use Predis;
use Predis\Connection\Aggregate\ClusterInterface;
use Predis\Connection\Aggregate\PredisCluster;
use Predis\Response\Status;
use Symfony\Component\Cache\CacheItem;
use Symfony\Component\Cache\Exception\LogicException;
use Symfony\Component\Cache\Exception\InvalidArgumentException;
use Symfony\Component\Cache\Marshaller\MarshallerInterface;
use Symfony\Component\Cache\Traits\RedisTrait;

/**
* Stores tag id <> cache id relationship as a Redis Set, lookup on invalidation using sPOP.
* Stores tag id <> cache id relationship as a Redis Set, lookup on invalidation using RENAME+SMEMBERS.
*
* Set (tag relation info) is stored without expiry (non-volatile), while cache always gets an expiry (volatile) even
* if not set by caller. Thus if you configure redis with the right eviction policy you can be safe this tag <> cache
* relationship survives eviction (cache cleanup when Redis runs out of memory).
*
* Requirements:
* - Server: Redis 3.2+
* - Client: PHP Redis 3.1.3+ OR Predis
* - Redis Server(s) configured with any `volatile-*` eviction policy, OR `noeviction` if it will NEVER fill up memory
* - Client: PHP Redis or Predis
* Note: Due to lack of RENAME support it is NOT recommended to use Cluster on Predis, instead use phpredis.
* - Server: Redis 2.8+
* Configured with any `volatile-*` eviction policy, OR `noeviction` if it will NEVER fill up memory
*
* Design limitations:
* - Max 2 billion cache keys per cache tag
* E.g. If you use a "all" items tag for expiry instead of clear(), that limits you to 2 billion cache items as well
* - Max 4 billion cache keys per cache tag as limited by Redis Set datatype.
* E.g. If you use a "all" items tag for expiry instead of clear(), that limits you to 4 billion cache items also.
*
* @see https://redis.io/topics/lru-cache#eviction-policies Documentation for Redis eviction policies.
* @see https://redis.io/topics/data-types#sets Documentation for Redis Set datatype.
* @see https://redis.io/commands/spop Documentation for sPOP operation, capable of retriving AND emptying a Set at once.
*
* @author Nicolas Grekas <[email protected]>
* @author André Rømcke <[email protected]>
Expand All @@ -46,11 +45,6 @@ class RedisTagAwareAdapter extends AbstractTagAwareAdapter
{
use RedisTrait;

/**
* Redis "Set" can hold more than 4 billion members, here we limit ourselves to PHP's > 2 billion max int (32Bit).
*/
private const POP_MAX_LIMIT = 2147483647 - 1;

/**
* Limits for how many keys are deleted in batch.
*/
Expand All @@ -62,26 +56,18 @@ class RedisTagAwareAdapter extends AbstractTagAwareAdapter
*/
private const DEFAULT_CACHE_TTL = 8640000;

/**
* @var bool|null
*/
private $redisServerSupportSPOP = null;

/**
* @param \Redis|\RedisArray|\RedisCluster|\Predis\ClientInterface $redisClient The redis client
* @param string $namespace The default namespace
* @param int $defaultLifetime The default lifetime
*
* @throws \Symfony\Component\Cache\Exception\LogicException If phpredis with version lower than 3.1.3.
*/
public function __construct($redisClient, string $namespace = '', int $defaultLifetime = 0, MarshallerInterface $marshaller = null)
{
$this->init($redisClient, $namespace, $defaultLifetime, $marshaller);

// Make sure php-redis is 3.1.3 or higher configured for Redis classes
if (!$this->redis instanceof \Predis\ClientInterface && version_compare(phpversion('redis'), '3.1.3', '<')) {
throw new LogicException('RedisTagAwareAdapter requires php-redis 3.1.3 or higher, alternatively use predis/predis');
if ($redisClient instanceof \Predis\ClientInterface && $redisClient->getConnection() instanceof ClusterInterface && !$redisClient->getConnection() instanceof PredisCluster) {
throw new InvalidArgumentException(sprintf('Unsupported Predis cluster connection: only "%s" is, "%s" given.', PredisCluster::class, \get_class($redisClient->getConnection())));
}

$this->init($redisClient, $namespace, $defaultLifetime, $marshaller);
}

/**
Expand Down Expand Up @@ -121,7 +107,7 @@ protected function doSave(array $values, ?int $lifetime, array $addTagData = [],
continue;
}
// setEx results
if (true !== $result && (!$result instanceof Status || $result !== Status::get('OK'))) {
if (true !== $result && (!$result instanceof Status || Status::get('OK') !== $result)) {
$failed[] = $id;
}
}
Expand All @@ -138,9 +124,10 @@ protected function doDelete(array $ids, array $tagData = []): bool
return true;
}

$predisCluster = $this->redis instanceof \Predis\ClientInterface && $this->redis->getConnection() instanceof ClusterInterface;
$predisCluster = $this->redis instanceof \Predis\ClientInterface && $this->redis->getConnection() instanceof PredisCluster;
$this->pipeline(static function () use ($ids, $tagData, $predisCluster) {
if ($predisCluster) {
// Unlike phpredis, Predis does not handle bulk calls for us against cluster
foreach ($ids as $id) {
yield 'del' => [$id];
}
Expand All @@ -161,46 +148,76 @@ protected function doDelete(array $ids, array $tagData = []): bool
*/
protected function doInvalidate(array $tagIds): bool
{
if (!$this->redisServerSupportSPOP()) {
if (!$this->redis instanceof \Predis\ClientInterface || !$this->redis->getConnection() instanceof PredisCluster) {
$movedTagSetIds = $this->renameKeys($this->redis, $tagIds);
} else {
$clusterConnection = $this->redis->getConnection();
$tagIdsByConnection = new \SplObjectStorage();
$movedTagSetIds = [];

foreach ($tagIds as $id) {
$connection = $clusterConnection->getConnectionByKey($id);
$slot = $tagIdsByConnection[$connection] ?? $tagIdsByConnection[$connection] = new \ArrayObject();
$slot[] = $id;
}

foreach ($tagIdsByConnection as $connection) {
$slot = $tagIdsByConnection[$connection];
$movedTagSetIds = array_merge($movedTagSetIds, $this->renameKeys(new $this->redis($connection, $this->redis->getOptions()), $slot->getArrayCopy()));
}
}

// No Sets found
if (!$movedTagSetIds) {
return false;
}

// Pop all tag info at once to avoid race conditions
$tagIdSets = $this->pipeline(static function () use ($tagIds) {
foreach ($tagIds as $tagId) {
// Client: Predis or PHP Redis 3.1.3+ (https://github.com/phpredis/phpredis/commit/d2e203a6)
// Server: Redis 3.2 or higher (https://redis.io/commands/spop)
yield 'sPop' => [$tagId, self::POP_MAX_LIMIT];
// Now safely take the time to read the keys in each set and collect ids we need to delete
$tagIdSets = $this->pipeline(static function () use ($movedTagSetIds) {
foreach ($movedTagSetIds as $movedTagId) {
yield 'sMembers' => [$movedTagId];
}
});

// Flatten generator result from pipeline, ignore keys (tag ids)
$ids = array_unique(array_merge(...iterator_to_array($tagIdSets, false)));
// Return combination of the temporary Tag Set ids and their values (cache ids)
$ids = array_merge($movedTagSetIds, ...iterator_to_array($tagIdSets, false));

// Delete cache in chunks to avoid overloading the connection
foreach (array_chunk($ids, self::BULK_DELETE_LIMIT) as $chunkIds) {
foreach (array_chunk(array_unique($ids), self::BULK_DELETE_LIMIT) as $chunkIds) {
$this->doDelete($chunkIds);
}

return true;
}

private function redisServerSupportSPOP(): bool
/**
* Renames several keys in order to be able to operate on them without risk of race conditions.
*
* Filters out keys that do not exist before returning new keys.
*
* @see https://redis.io/commands/rename
* @see https://redis.io/topics/cluster-spec#keys-hash-tags
*
* @return array Filtered list of the valid moved keys (only those that existed)
*/
private function renameKeys($redis, array $ids): array
{
if (null !== $this->redisServerSupportSPOP) {
return $this->redisServerSupportSPOP;
}
$newIds = [];
$uniqueToken = bin2hex(random_bytes(10));

foreach ($this->getHosts() as $host) {
$info = $host->info('Server');
$info = isset($info['Server']) ? $info['Server'] : $info;
if (version_compare($info['redis_version'], '3.2', '<')) {
CacheItem::log($this->logger, 'Redis server needs to be version 3.2 or higher, your Redis server was detected as '.$info['redis_version']);
$results = $this->pipeline(static function () use ($ids, $uniqueToken) {
foreach ($ids as $id) {
yield 'rename' => [$id, '{'.$id.'}'.$uniqueToken];
}
}, $redis);

return $this->redisServerSupportSPOP = false;
foreach ($results as $id => $result) {
if (true === $result || ($result instanceof Status && Status::get('OK') === $result)) {
// Only take into account if ok (key existed), will be false on phpredis if it did not exist
$newIds[] = '{'.$id.'}'.$uniqueToken;
}
}

return $this->redisServerSupportSPOP = true;
return $newIds;
}
}
2 changes: 2 additions & 0 deletions src/Symfony/Component/Cache/CHANGELOG.md
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Expand Up @@ -6,6 +6,8 @@ CHANGELOG

* added support for connecting to Redis Sentinel clusters
* added argument `$prefix` to `AdapterInterface::clear()`
* improved `RedisTagAwareAdapter` to support Redis server >= 2.8 and up to 4B items per tag
* [BC BREAK] `RedisTagAwareAdapter` is not compatible with `RedisCluster` from `Predis` anymore, use `phpredis` instead

4.3.0
-----
Expand Down
35 changes: 0 additions & 35 deletions src/Symfony/Component/Cache/Tests/Adapter/PredisTagAwareRedisClusterAdapterTest.php
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This file was deleted.

35 changes: 23 additions & 12 deletions src/Symfony/Component/Cache/Traits/RedisTrait.php
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Original file line number Diff line number Diff line change
Expand Up @@ -55,9 +55,17 @@ private function init($redisClient, string $namespace, int $defaultLifetime, ?Ma
if (preg_match('#[^-+_.A-Za-z0-9]#', $namespace, $match)) {
throw new InvalidArgumentException(sprintf('RedisAdapter namespace contains "%s" but only characters in [-+_.A-Za-z0-9] are allowed.', $match[0]));
}

if (!$redisClient instanceof \Redis && !$redisClient instanceof \RedisArray && !$redisClient instanceof \RedisCluster && !$redisClient instanceof \Predis\ClientInterface && !$redisClient instanceof RedisProxy && !$redisClient instanceof RedisClusterProxy) {
throw new InvalidArgumentException(sprintf('%s() expects parameter 1 to be Redis, RedisArray, RedisCluster or Predis\ClientInterface, %s given.', __METHOD__, \is_object($redisClient) ? \get_class($redisClient) : \gettype($redisClient)));
}

if ($redisClient instanceof \Predis\ClientInterface && $redisClient->getOptions()->exceptions) {
$options = clone $redisClient->getOptions();
\Closure::bind(function () { $this->options['exceptions'] = false; }, $options, $options)();
$redisClient = new $redisClient($redisClient->getConnection(), $options);
}

$this->redis = $redisClient;
$this->marshaller = $marshaller ?? new DefaultMarshaller();
}
Expand Down Expand Up @@ -277,6 +285,7 @@ public static function createConnection($dsn, array $options = [])
$params['replication'] = true;
$hosts[0] += ['alias' => 'master'];
}
$params['exceptions'] = false;

$redis = new $class($hosts, array_diff_key($params, self::$defaultConnectionOptions));
if (isset($params['redis_sentinel'])) {
Expand Down Expand Up @@ -414,40 +423,42 @@ protected function doSave(array $values, $lifetime)
}
}
});

foreach ($results as $id => $result) {
if (true !== $result && (!$result instanceof Status || $result !== Status::get('OK'))) {
if (true !== $result && (!$result instanceof Status || Status::get('OK') !== $result)) {
$failed[] = $id;
}
}

return $failed;
}

private function pipeline(\Closure $generator): \Generator
private function pipeline(\Closure $generator, $redis = null): \Generator
{
$ids = [];
$redis = $redis ?? $this->redis;

if ($this->redis instanceof RedisClusterProxy || $this->redis instanceof \RedisCluster || ($this->redis instanceof \Predis\ClientInterface && $this->redis->getConnection() instanceof RedisCluster)) {
if ($redis instanceof RedisClusterProxy || $redis instanceof \RedisCluster || ($redis instanceof \Predis\ClientInterface && $redis->getConnection() instanceof RedisCluster)) {
// phpredis & predis don't support pipelining with RedisCluster
// see https://github.com/phpredis/phpredis/blob/develop/cluster.markdown#pipelining
// see https://github.com/nrk/predis/issues/267#issuecomment-123781423
$results = [];
foreach ($generator() as $command => $args) {
$results[] = $this->redis->{$command}(...$args);
$results[] = $redis->{$command}(...$args);
$ids[] = $args[0];
}
} elseif ($this->redis instanceof \Predis\ClientInterface) {
$results = $this->redis->pipeline(function ($redis) use ($generator, &$ids) {
} elseif ($redis instanceof \Predis\ClientInterface) {
$results = $redis->pipeline(static function ($redis) use ($generator, &$ids) {
foreach ($generator() as $command => $args) {
$redis->{$command}(...$args);
$ids[] = $args[0];
}
});
} elseif ($this->redis instanceof \RedisArray) {
} elseif ($redis instanceof \RedisArray) {
$connections = $results = $ids = [];
foreach ($generator() as $command => $args) {
if (!isset($connections[$h = $this->redis->_target($args[0])])) {
$connections[$h] = [$this->redis->_instance($h), -1];
if (!isset($connections[$h = $redis->_target($args[0])])) {
$connections[$h] = [$redis->_instance($h), -1];
$connections[$h][0]->multi(\Redis::PIPELINE);
}
$connections[$h][0]->{$command}(...$args);
Expand All @@ -461,12 +472,12 @@ private function pipeline(\Closure $generator): \Generator
$results[$k] = $connections[$h][$c];
}
} else {
$this->redis->multi(\Redis::PIPELINE);
$redis->multi(\Redis::PIPELINE);
foreach ($generator() as $command => $args) {
$this->redis->{$command}(...$args);
$redis->{$command}(...$args);
$ids[] = $args[0];
}
$results = $this->redis->exec();
$results = $redis->exec();
}

foreach ($ids as $k => $id) {
Expand Down