jenkins-bot has submitted this change and it was merged. (
https://gerrit.wikimedia.org/r/385127 )
Change subject: objectcache: Always use interim values on WAN cache tombstones
......................................................................
objectcache: Always use interim values on WAN cache tombstones
This stores values for very short times while the main
value is a tombstone in case of particularly high traffic.
Also make mutex keys expire immediately on unlock.
Change-Id: I4ec5cf7f8b49239fdd2518e5d955534877a0f7ee
---
M includes/libs/objectcache/WANObjectCache.php
M tests/phpunit/includes/libs/objectcache/WANObjectCacheTest.php
2 files changed, 10 insertions(+), 4 deletions(-)
Approvals:
Krinkle: Looks good to me, approved
jenkins-bot: Verified
diff --git a/includes/libs/objectcache/WANObjectCache.php
b/includes/libs/objectcache/WANObjectCache.php
index 15e5759..120ae45 100644
--- a/includes/libs/objectcache/WANObjectCache.php
+++ b/includes/libs/objectcache/WANObjectCache.php
@@ -964,6 +964,10 @@
// A deleted key with a negative TTL left must be tombstoned
$isTombstone = ( $curTTL !== null && $value === false );
+ if ( $isTombstone && $lockTSE <= 0 ) {
+ // Use the INTERIM value for tombstoned keys to reduce
regeneration load
+ $lockTSE = 1;
+ }
// Assume a key is hot if requested soon after invalidation
$isHot = ( $curTTL !== null && $curTTL <= 0 && abs( $curTTL )
<= $lockTSE );
// Use the mutex if there is no value and a busy fallback is
given
@@ -1032,7 +1036,7 @@
if ( $lockAcquired ) {
// Avoid using delete() to avoid pointless mcrouter
broadcasting
- $this->cache->changeTTL( self::MUTEX_KEY_PREFIX . $key,
1 );
+ $this->cache->changeTTL( self::MUTEX_KEY_PREFIX . $key,
(int)$preCallbackTime - 60 );
}
return $value;
@@ -1751,7 +1755,7 @@
return array_diff( $keys, $keysFound );
}
- /**
+ /**
* @param array $keys
* @param array $checkKeys
* @return array Map of (cache key => mixed)
diff --git a/tests/phpunit/includes/libs/objectcache/WANObjectCacheTest.php
b/tests/phpunit/includes/libs/objectcache/WANObjectCacheTest.php
index c5a1759..e23f318 100644
--- a/tests/phpunit/includes/libs/objectcache/WANObjectCacheTest.php
+++ b/tests/phpunit/includes/libs/objectcache/WANObjectCacheTest.php
@@ -159,8 +159,9 @@
$this->assertEquals( 9, $hit, "Values evicted" );
$key = reset( $keys );
- // Get into cache
+ // Get into cache (default process cache group)
$this->cache->getWithSetCallback( $key, 100, $callback, [
'pcTTL' => 5 ] );
+ $this->assertEquals( 10, $hit, "Value calculated" );
$this->cache->getWithSetCallback( $key, 100, $callback, [
'pcTTL' => 5 ] );
$this->assertEquals( 10, $hit, "Value cached" );
$outerCallback = function () use ( &$callback, $key ) {
@@ -168,7 +169,8 @@
return 43 + $v;
};
- $this->cache->getWithSetCallback( $key, 100, $outerCallback );
+ // Outer key misses and refuses inner key process cache value
+ $this->cache->getWithSetCallback( "$key-miss-outer", 100,
$outerCallback );
$this->assertEquals( 11, $hit, "Nested callback value process
cache skipped" );
}
--
To view, visit https://gerrit.wikimedia.org/r/385127
To unsubscribe, visit https://gerrit.wikimedia.org/r/settings
Gerrit-MessageType: merged
Gerrit-Change-Id: I4ec5cf7f8b49239fdd2518e5d955534877a0f7ee
Gerrit-PatchSet: 8
Gerrit-Project: mediawiki/core
Gerrit-Branch: master
Gerrit-Owner: Aaron Schulz <asch...@wikimedia.org>
Gerrit-Reviewer: Krinkle <krinklem...@gmail.com>
Gerrit-Reviewer: jenkins-bot <>
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