8000 [Cache] Decrease the probability of invalidation loss on tag eviction by sbelyshkin · Pull Request #43301 · symfony/symfony · GitHub
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[Cache] Decrease the probability of invalidation loss on tag eviction #43301

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[Cache] Decrease the probability of invalidation loss on tag eviction #43301

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a568510
[Cache] Decrease the probability of invalidation loss after tag eviction
sbelyshkin Sep 17, 2021
2abdaf2
[Cache] Use random numbers for initialization of tag version
sbelyshkin Oct 7, 2021
4e7c4fb
[Cache] Expand the range of allowed version numbers
sbelyshkin Oct 8, 2021
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[Cache] Use random numbers for initialization of tag version
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@sbelyshkin
sbelyshkin committed Oct 10, 2021
commit 2abdaf24f51b5acf21b606e6e8545ba0192823e0
10 changes: 4 additions & 6 deletions src/Symfony/Component/Cache/Adapter/TagAwareAdapter.php
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Original file line number Diff line number Diff line change
Expand Up @@ -412,21 +412,19 @@ private function getTagVersions(array $tagsByKey, array $invalidatedTags = [])
return $tagVersions;
}

$tod = gettimeofday();
$newVersion = $tod['sec'] * 1000000 + $tod['usec'];
$updatedTags = [];
foreach ($this->tags->getItems(array_keys($tags)) as $tag => $version) {
$tag = $tags[$tag];

if ($version->isHit()) {
$tagVersions[$tag] = $version->get();
} else {
$tagVersions[$tag] = $newVersion;
$updatedTags[$tag] = $version->set($newVersion);
$tagVersions[$tag] = mt_rand(0, \PHP_INT_MAX);
$updatedTags[$tag] = $version->set($tagVersions[$tag]);
}

if (isset($invalidatedTags[$tag])) {
$updatedTags[$tag] = $version->set(++$tagVersions[$tag]);
if (isset($invalidatedTags[$tag]) && !isset($updatedTags[$tag])) {
$updatedTags[$tag] = $version->set(\PHP_INT_MAX === $tagVersions[$tag] ? 0 : ++$tagVersions[$tag]);
}
$this->knownTagVersions[$tag] = [$now, $tagVersions[$tag]];
}
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