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diff --git a/src/applications/diffusion/conduit/DiffusionLastModifiedQueryConduitAPIMethod.php b/src/applications/diffusion/conduit/DiffusionLastModifiedQueryConduitAPIMethod.php
--- a/src/applications/diffusion/conduit/DiffusionLastModifiedQueryConduitAPIMethod.php
+++ b/src/applications/diffusion/conduit/DiffusionLastModifiedQueryConduitAPIMethod.php
@@ -115,6 +115,10 @@
$graph_cache = new PhabricatorRepositoryGraphCache();
$results = array();
+
+ // Spend no more than this many total seconds trying to satisfy queries
+ // via the graph cache.
+ $remaining_time = 10.0;
foreach ($map as $path => $commit) {
$path_id = idx($path_map, $path);
if (!$path_id) {
@@ -125,13 +129,21 @@
continue;
}
+ $t_start = microtime(true);
$cache_result = $graph_cache->loadLastModifiedCommitID(
$commit_id,
- $path_id);
+ $path_id,
+ $remaining_time);
+ $t_end = microtime(true);
if ($cache_result !== false) {
$results[$path] = $cache_result;
}
+
+ $remaining_time -= ($t_end - $t_start);
+ if ($remaining_time <= 0) {
+ break;
+ }
}
if ($results) {
diff --git a/src/applications/repository/graphcache/PhabricatorRepositoryGraphCache.php b/src/applications/repository/graphcache/PhabricatorRepositoryGraphCache.php
--- a/src/applications/repository/graphcache/PhabricatorRepositoryGraphCache.php
+++ b/src/applications/repository/graphcache/PhabricatorRepositoryGraphCache.php
@@ -102,6 +102,10 @@
}
// Otherwise, the rebuild gave us the data, so we can keep going.
+
+ $did_fill = true;
+ } else {
+ $did_fill = false;
}
// Sanity check so we can survive and recover from bad data.
@@ -147,12 +151,17 @@
$commit_id = $parent_id;
// Periodically check if we've spent too long looking for a result
- // in the cache, and return so we can fall back to a VCS operation. This
- // keeps us from having a degenerate worst case if, e.g., the cache
- // is cold and we need to inspect a very large number of blocks
+ // in the cache, and return so we can fall back to a VCS operation.
+ // This keeps us from having a degenerate worst case if, e.g., the
+ // cache is cold and we need to inspect a very large number of blocks
// to satisfy the query.
- if (((++$iterations) % 64) === 0) {
+ ++$iterations;
+
+ // If we performed a cache fill in this cycle, always check the time
+ // limit, since cache fills may take a significant amount of time.
+
+ if ($did_fill || ($iterations % 64 === 0)) {
$t_end = microtime(true);
if (($t_end - $t_start) > $time) {
return false;

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