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APCng storage - avoid worst-case memory usage in buildPermutationTree #123

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Merged
LKaemmerling merged 5 commits into from
Mar 5, 2025
Merged

APCng storage - avoid worst-case memory usage in buildPermutationTree #123

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88f9f61
APCng storage - avoid worst-case memory usage in buildPermutationTree
Princemachiavelli Jun 21, 2023
d7e3e50
Merge branch 'main' into main
LKaemmerling Nov 24, 2023
dd28936
Merge branch 'main' into main
Princemachiavelli Sep 15, 2024
bd85cc3
Merge branch 'main' into main
LKaemmerling Mar 5, 2025
a1a53f1
Fix PHPstan errors
LKaemmerling Mar 5, 2025
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38 changes: 14 additions & 24 deletions src/Prometheus/Storage/APCng.php
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Original file line number Diff line number Diff line change
Expand Up @@ -430,33 +430,24 @@ private function metaData(array $data): array
* [9] => ['/private', 'get', 'fail'], [10] => ['/private', 'post', 'success'], [11] => ['/private', 'post', 'fail'],
* [12] => ['/metrics', 'put', 'success'], [13] => ['/metrics', 'put', 'fail'], [14] => ['/metrics', 'get', 'success'],
* [15] => ['/metrics', 'get', 'fail'], [16] => ['/metrics', 'post', 'success'], [17] => ['/metrics', 'post', 'fail']
* @param array<string> $labelNames
* @param array<array> $labelValues
* @return array<array>
* @return \Generator<array>
*/
private function buildPermutationTree(array $labelNames, array $labelValues): array /** @phpstan-ignore-line */
{
$treeRowCount = count(array_keys($labelNames));
$numElements = 1;
$treeInfo = [];
for ($i = $treeRowCount - 1; $i >= 0; $i--) {
$treeInfo[$i]['numInRow'] = count($labelValues[$i]);
$numElements *= $treeInfo[$i]['numInRow'];
$treeInfo[$i]['numInTree'] = $numElements;
}

$map = array_fill(0, $numElements, []);
for ($row = 0; $row < $treeRowCount; $row++) {
$col = $i = 0;
while ($i < $numElements) {
$val = $labelValues[$row][$col];
$map[$i] = array_merge($map[$i], array($val));
if (++$i % ($treeInfo[$row]['numInTree'] / $treeInfo[$row]['numInRow']) == 0) {
$col = ++$col % $treeInfo[$row]['numInRow'];
private function buildPermutationTree(array $labelValues): \Generator /** @phpstan-ignore-line */
{
if (count($labelValues) > 0) {
$lastIndex = array_key_last($labelValues);
$currentValue = array_pop($labelValues);
if ($currentValue != null) {
foreach ($this->buildPermutationTree($labelValues) as $prefix) {
foreach ($currentValue as $value) {
yield $prefix + [$lastIndex => $value];
}
}
}
} else {
yield [];
}
return $map;
}

/**
Expand Down Expand Up @@ -557,10 +548,9 @@ private function getValues(string $type, array $metaData): array /** @phpstan-ig
if (isset($metaData['buckets'])) {
$metaData['buckets'][] = 'sum';
$labels[] = $metaData['buckets'];
$metaData['labelNames'][] = '__histogram_buckets';
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@Princemachiavelli Princemachiavelli Jun 21, 2023

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Since I don't use the number of label names anymore, I removed that parameter from buildPermutationTree and removed this line as it seemed unused. I don't see any change in the output for histograms but if this actually used then I can re-add it.

}

$labelValuesList = $this->buildPermutationTree($metaData['labelNames'], $labels);
$labelValuesList = $this->buildPermutationTree($labels);
unset($labels);
$histogramBucket = '';
foreach ($labelValuesList as $labelValues) {
Expand Down