327 lines
9.6 KiB
PHP
327 lines
9.6 KiB
PHP
<?php
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/**
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* @group HashRing
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* @covers HashRing
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*/
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class HashRingTest extends PHPUnit\Framework\TestCase {
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use MediaWikiCoversValidator;
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public function testHashRingSerialize() {
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$map = [ 's1' => 3, 's2' => 10, 's3' => 2, 's4' => 10, 's5' => 2, 's6' => 3 ];
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$ring = new HashRing( $map, 'md5' );
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$serialized = serialize( $ring );
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$ringRemade = unserialize( $serialized );
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for ( $i = 0; $i < 100; $i++ ) {
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$this->assertEquals(
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$ring->getLocation( "hello$i" ),
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$ringRemade->getLocation( "hello$i" ),
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'Items placed at proper locations'
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);
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}
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}
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public function testHashRingMapping() {
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// SHA-1 based and weighted
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$ring = new HashRing(
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[ 's1' => 1, 's2' => 1, 's3' => 2, 's4' => 2, 's5' => 2, 's6' => 3, 's7' => 0 ],
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'sha1'
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);
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$this->assertEquals(
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[ 's1' => 1, 's2' => 1, 's3' => 2, 's4' => 2, 's5' => 2, 's6' => 3 ],
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$ring->getLocationWeights(),
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'Normalized location weights'
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);
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$locations = [];
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for ( $i = 0; $i < 25; $i++ ) {
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$locations[ "hello$i"] = $ring->getLocation( "hello$i" );
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}
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$expectedLocations = [
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"hello0" => "s4",
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"hello1" => "s6",
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"hello2" => "s3",
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"hello3" => "s6",
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"hello4" => "s6",
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"hello5" => "s4",
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"hello6" => "s3",
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"hello7" => "s4",
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"hello8" => "s3",
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"hello9" => "s3",
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"hello10" => "s3",
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"hello11" => "s5",
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"hello12" => "s4",
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"hello13" => "s5",
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"hello14" => "s2",
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"hello15" => "s5",
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"hello16" => "s6",
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"hello17" => "s5",
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"hello18" => "s1",
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"hello19" => "s1",
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"hello20" => "s6",
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"hello21" => "s5",
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"hello22" => "s3",
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"hello23" => "s4",
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"hello24" => "s1"
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];
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$this->assertEquals( $expectedLocations, $locations, 'Items placed at proper locations' );
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$locations = [];
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for ( $i = 0; $i < 5; $i++ ) {
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$locations[ "hello$i"] = $ring->getLocations( "hello$i", 2 );
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}
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$expectedLocations = [
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"hello0" => [ "s4", "s5" ],
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"hello1" => [ "s6", "s5" ],
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"hello2" => [ "s3", "s1" ],
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"hello3" => [ "s6", "s5" ],
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"hello4" => [ "s6", "s3" ],
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];
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$this->assertEquals( $expectedLocations, $locations, 'Items placed at proper locations' );
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}
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/**
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* @dataProvider providor_getHashLocationWeights
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*/
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public function testHashRingRatios( $locations, $expectedHits ) {
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$ring = new HashRing( $locations, 'whirlpool' );
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$locationStats = array_fill_keys( array_keys( $locations ), 0 );
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for ( $i = 0; $i < 10000; ++$i ) {
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++$locationStats[$ring->getLocation( "key-$i" )];
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}
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$this->assertEquals( $expectedHits, $locationStats );
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}
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public static function providor_getHashLocationWeights() {
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return [
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[
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[ 'big' => 10, 'medium' => 5, 'small' => 1 ],
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[ 'big' => 6037, 'medium' => 3314, 'small' => 649 ]
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]
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];
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}
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/**
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* @dataProvider providor_getHashLocationWeights2
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*/
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public function testHashRingRatios2( $locations, $expected ) {
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$ring = new HashRing( $locations, 'sha1' );
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$locationStats = array_fill_keys( array_keys( $locations ), 0 );
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for ( $i = 0; $i < 1000; ++$i ) {
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foreach ( $ring->getLocations( "key-$i", 3 ) as $location ) {
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++$locationStats[$location];
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}
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}
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$this->assertEquals( $expected, $locationStats );
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}
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public static function providor_getHashLocationWeights2() {
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return [
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[
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[ 'big1' => 10, 'big2' => 10, 'big3' => 10, 'small1' => 1, 'small2' => 1 ],
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[ 'big1' => 929, 'big2' => 899, 'big3' => 887, 'small1' => 143, 'small2' => 142 ]
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]
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];
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}
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public function testHashRingEjection() {
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$map = [ 's1' => 5, 's2' => 5, 's3' => 10, 's4' => 10, 's5' => 5, 's6' => 5 ];
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$ring = new HashRing( $map, 'md5' );
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$ring->ejectFromLiveRing( 's3', 30 );
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$ring->ejectFromLiveRing( 's6', 15 );
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$this->assertEquals(
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[ 's1' => 5, 's2' => 5, 's4' => 10, 's5' => 5 ],
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$ring->getLiveLocationWeights(),
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'Live location weights'
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);
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for ( $i = 0; $i < 100; ++$i ) {
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$key = "key-$i";
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$this->assertNotEquals( 's3', $ring->getLiveLocation( $key ), 'ejected' );
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$this->assertNotEquals( 's6', $ring->getLiveLocation( $key ), 'ejected' );
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if ( !in_array( $ring->getLocation( $key ), [ 's3', 's6' ], true ) ) {
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$this->assertEquals(
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$ring->getLocation( $key ),
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$ring->getLiveLocation( $key ),
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"Live ring otherwise matches (#$i)"
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);
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$this->assertEquals(
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$ring->getLocations( $key, 1 ),
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$ring->getLiveLocations( $key, 1 ),
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"Live ring otherwise matches (#$i)"
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);
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}
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}
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}
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public function testHashRingCollision() {
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$ring1 = new HashRing( [ 0 => 1, 6497 => 1 ] );
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$ring2 = new HashRing( [ 6497 => 1, 0 => 1 ] );
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for ( $i = 0; $i < 100; ++$i ) {
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$this->assertEquals( $ring1->getLocation( $i ), $ring2->getLocation( $i ) );
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}
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}
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public function testHashRingKetamaMode() {
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// Same as https://github.com/RJ/ketama/blob/master/ketama.servers
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$map = [
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'10.0.1.1:11211' => 600,
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'10.0.1.2:11211' => 300,
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'10.0.1.3:11211' => 200,
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'10.0.1.4:11211' => 350,
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'10.0.1.5:11211' => 1000,
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'10.0.1.6:11211' => 800,
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'10.0.1.7:11211' => 950,
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'10.0.1.8:11211' => 100
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];
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$ring = new HashRing( $map, 'md5' );
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$wrapper = \Wikimedia\TestingAccessWrapper::newFromObject( $ring );
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$ketama_test = function ( $count ) use ( $wrapper ) {
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$baseRing = $wrapper->baseRing;
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$lines = [];
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for ( $key = 0; $key < $count; ++$key ) {
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$location = $wrapper->getLocation( $key );
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$itemPos = $wrapper->getItemPosition( $key );
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$nodeIndex = $wrapper->findNodeIndexForPosition( $itemPos, $baseRing );
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$nodePos = $baseRing[$nodeIndex][HashRing::KEY_POS];
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$lines[] = sprintf( "%u %u %s\n", $itemPos, $nodePos, $location );
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}
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return "\n" . implode( '', $lines );
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};
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// Known correct values generated from C code:
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// https://github.com/RJ/ketama/blob/master/libketama/ketama_test.c
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$expected = <<<EOT
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2216742351 2217271743 10.0.1.1:11211
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943901380 949045552 10.0.1.5:11211
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2373066440 2374693370 10.0.1.6:11211
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2127088620 2130338203 10.0.1.6:11211
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2046197672 2051996197 10.0.1.7:11211
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2134629092 2135172435 10.0.1.1:11211
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470382870 472541453 10.0.1.7:11211
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1608782991 1609789509 10.0.1.3:11211
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2516119753 2520092206 10.0.1.2:11211
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3465331781 3466294492 10.0.1.4:11211
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1749342675 1753760600 10.0.1.5:11211
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1136464485 1137779711 10.0.1.1:11211
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3620997826 3621580689 10.0.1.7:11211
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283385029 285581365 10.0.1.6:11211
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2300818346 2302165654 10.0.1.5:11211
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2132603803 2134614475 10.0.1.8:11211
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2962705863 2969767984 10.0.1.2:11211
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786427760 786565633 10.0.1.5:11211
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4095887727 4096760944 10.0.1.6:11211
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2906459679 2906987515 10.0.1.6:11211
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137884056 138922607 10.0.1.4:11211
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81549628 82491298 10.0.1.6:11211
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3530020790 3530525869 10.0.1.6:11211
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4231817527 4234960467 10.0.1.7:11211
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2011099423 2014738083 10.0.1.7:11211
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107620750 120968799 10.0.1.6:11211
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3979113294 3981926993 10.0.1.4:11211
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273671938 276355738 10.0.1.4:11211
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4032816947 4033300359 10.0.1.5:11211
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464234862 466093615 10.0.1.1:11211
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3007059764 3007671127 10.0.1.5:11211
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542337729 542491760 10.0.1.7:11211
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4040385635 4044064727 10.0.1.5:11211
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3319802648 3320661601 10.0.1.7:11211
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1032153571 1035085391 10.0.1.1:11211
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3543939100 3545608820 10.0.1.5:11211
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3876899353 3885324049 10.0.1.2:11211
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3771318181 3773259708 10.0.1.8:11211
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3457906597 3459285639 10.0.1.5:11211
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3028975062 3031083168 10.0.1.7:11211
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244467158 250943416 10.0.1.5:11211
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1604785716 1609789509 10.0.1.3:11211
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3905343649 3905751132 10.0.1.1:11211
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1713497623 1725056963 10.0.1.5:11211
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1668356087 1668827816 10.0.1.5:11211
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3427369836 3438933308 10.0.1.1:11211
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2515850457 2520092206 10.0.1.2:11211
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3886138983 3887390208 10.0.1.1:11211
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4019334756 4023153300 10.0.1.8:11211
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1170561012 1170785765 10.0.1.7:11211
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1841809344 1848425105 10.0.1.6:11211
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973223976 973369204 10.0.1.1:11211
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358093210 359562433 10.0.1.6:11211
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378350808 380841931 10.0.1.5:11211
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4008477862 4012085095 10.0.1.7:11211
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1027226549 1028630030 10.0.1.6:11211
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2386583967 2387706118 10.0.1.1:11211
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522892146 524831677 10.0.1.7:11211
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3779194982 3788912803 10.0.1.5:11211
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3764731657 3771312500 10.0.1.7:11211
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184756999 187529415 10.0.1.6:11211
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838351231 845886003 10.0.1.3:11211
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2827220548 2828019973 10.0.1.6:11211
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3604721411 3607668249 10.0.1.6:11211
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472866282 475506254 10.0.1.5:11211
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2752268796 2754833471 10.0.1.5:11211
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1791464754 1795042583 10.0.1.7:11211
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3029359475 3031083168 10.0.1.7:11211
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3633378211 3639985542 10.0.1.6:11211
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3148267284 3149217023 10.0.1.6:11211
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163887996 166705043 10.0.1.7:11211
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3642803426 3649125922 10.0.1.7:11211
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3901799218 3902199881 10.0.1.7:11211
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418045394 425867331 10.0.1.6:11211
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346775981 348578169 10.0.1.6:11211
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368352208 372224616 10.0.1.7:11211
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2643711995 2644259911 10.0.1.5:11211
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2032983336 2033860601 10.0.1.6:11211
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3567842357 3572867530 10.0.1.2:11211
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1024982737 1028630030 10.0.1.6:11211
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933966832 938106828 10.0.1.7:11211
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2102520899 2103402846 10.0.1.7:11211
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3537205399 3538094881 10.0.1.7:11211
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2311233534 2314593262 10.0.1.1:11211
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2500514664 2503565236 10.0.1.7:11211
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1091958846 1093484995 10.0.1.6:11211
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3984972691 3987453644 10.0.1.1:11211
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2669994439 2670911201 10.0.1.4:11211
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2846111786 2846115813 10.0.1.5:11211
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1805010806 1808593732 10.0.1.8:11211
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1587024774 1587746378 10.0.1.5:11211
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3214549588 3215619351 10.0.1.2:11211
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1965214866 1970922428 10.0.1.7:11211
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1038671000 1040777775 10.0.1.7:11211
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820820468 823114475 10.0.1.6:11211
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2722835329 2723166435 10.0.1.5:11211
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1602053414 1604196066 10.0.1.5:11211
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1330835426 1335097278 10.0.1.5:11211
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556547565 557075710 10.0.1.4:11211
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2977587884 2978402952 10.0.1.1:11211
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EOT;
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$this->assertEquals( $expected, $ketama_test( 100 ), 'Ketama mode (diff check)' );
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// Hash of known correct values from C code
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$this->assertEquals(
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'd1a4912a80e4654ec2e4e462c8b911c6',
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md5( $ketama_test( 1e3 ) ),
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'Ketama mode (large, MD5 check)'
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);
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// Slower, full upstream MD5 check, manually verified 3/21/2018
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// $this->assertEquals( '5672b131391f5aa2b280936aec1eea74', md5( $ketama_test( 1e6 ) ) );
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}
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}
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