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Don't try to rebuild a repository graph cache bucket more than once per request

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Summary: Ref T2683. This is a small optimization, but it has low complexity: don't rebuild a bucket more than once in the same request, since it will almost always be the same. Bucket rebuilds are pretty cheap, but this saves a few queries.

Test Plan:
  - After discovering (but before parsing) a commit, viewed its browse view. Verified that this patch causes us to perform only one bucket rebuild, and therefore reduces the number of queries we issue.
  - Parsed the commit and viewed the browse view again, got successful rebuild and then fills from cache.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T2683

Differential Revision: https://secure.phabricator.com/D9055
This commit is contained in:
epriestley 2014-05-11 08:46:41 -07:00
parent cfa265f020
commit 84fc8f0baf
1 changed files with 16 additions and 0 deletions
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16
src/applications/repository/graphcache/PhabricatorRepositoryGraphCache.php
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@ -55,6 +55,8 @@
*/
final class PhabricatorRepositoryGraphCache {
private $rebuiltKeys = array();
/* -( Querying the Graph Cache )------------------------------------------- */
@ -282,6 +284,20 @@ final class PhabricatorRepositoryGraphCache {
* @task cache
*/
private function rebuildBucket($bucket_key, array $current_data) {
// First, check if we've already rebuilt this bucket. In some cases (like
// browsing a repository at some commit) it's common to issue many lookups
// against one commit. If that commit has been discovered but not yet
// fully imported, we'll repeatedly attempt to rebuild the bucket. If the
// first rebuild did not work, subsequent rebuilds are very unlikely to
// have any effect. We can just skip the rebuild in these cases.
if (isset($this->rebuiltKeys[$bucket_key])) {
return $current_data;
} else {
$this->rebuiltKeys[$bucket_key] = true;
}
$bucket_min = ($bucket_key * $this->getBucketSize());
$bucket_max = ($bucket_min + $this->getBucketSize()) - 1;