diff --git a/resources/sql/autopatches/20150425.isclosed.sql b/resources/sql/autopatches/20150425.isclosed.sql
new file mode 100644
index 0000000000..3d8586b565
--- /dev/null
+++ b/resources/sql/autopatches/20150425.isclosed.sql
@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_repository.repository_refcursor
+  ADD isClosed BOOL NOT NULL;
diff --git a/src/applications/diffusion/controller/DiffusionRefTableController.php b/src/applications/diffusion/controller/DiffusionRefTableController.php
index f3f005594d..340d6d5e63 100644
--- a/src/applications/diffusion/controller/DiffusionRefTableController.php
+++ b/src/applications/diffusion/controller/DiffusionRefTableController.php
@@ -75,7 +75,7 @@ final class DiffusionRefTableController extends DiffusionController {
 
         $cached_hash = idx($cache, 'identifier');
         if ($cached_hash !== null) {
-          $cache_hash = DiffusionView::linkCommit(
+          $cached_hash = DiffusionView::linkCommit(
             $repository,
             $cached_hash);
         }
diff --git a/src/applications/diffusion/query/lowlevel/DiffusionLowLevelMercurialBranchesQuery.php b/src/applications/diffusion/query/lowlevel/DiffusionLowLevelMercurialBranchesQuery.php
index 015f0b1c8e..1e040e21e9 100644
--- a/src/applications/diffusion/query/lowlevel/DiffusionLowLevelMercurialBranchesQuery.php
+++ b/src/applications/diffusion/query/lowlevel/DiffusionLowLevelMercurialBranchesQuery.php
@@ -16,29 +16,57 @@ final class DiffusionLowLevelMercurialBranchesQuery
   protected function executeQuery() {
     $repository = $this->getRepository();
 
+    $specs = array();
     if ($this->contains !== null) {
-      $spec = hgsprintf('(descendants(%s) and head())', $this->contains);
+      $specs['all'] = hgsprintf(
+        '(descendants(%s) and head())',
+        $this->contains);
+      $specs['open'] = hgsprintf(
+        '(descendants(%s) and head() and not closed())',
+        $this->contains);
     } else {
-      $spec = hgsprintf('head()');
+      $specs['all'] = hgsprintf('head()');
+      $specs['open'] = hgsprintf('head() and not closed()');
     }
 
-    list($stdout) = $repository->execxLocalCommand(
-      'log --template %s --rev %s',
-      '{node}\1{branch}\2',
-      $spec);
+    $futures = array();
+    foreach ($specs as $key => $spec) {
+      $futures[$key] = $repository->getLocalCommandFuture(
+        'log --template %s --rev %s',
+        '{node}\1{branch}\2',
+        $spec);
+    }
 
     $branches = array();
+    $open = array();
+    foreach (new FutureIterator($futures) as $key => $future) {
+      list($stdout) = $future->resolvex();
 
-    $lines = explode("\2", $stdout);
-    $lines = array_filter($lines);
-    foreach ($lines as $line) {
-      list($node, $branch) = explode("\1", $line);
-      $branches[] = id(new DiffusionRepositoryRef())
-        ->setShortName($branch)
-        ->setCommitIdentifier($node);
+      $lines = explode("\2", $stdout);
+      $lines = array_filter($lines);
+      foreach ($lines as $line) {
+        list($node, $branch) = explode("\1", $line);
+        $id = $node.'/'.$branch;
+        if (empty($branches[$id])) {
+          $branches[$id] = id(new DiffusionRepositoryRef())
+            ->setShortName($branch)
+            ->setCommitIdentifier($node);
+        }
+
+        if ($key == 'open') {
+          $open[$id] = true;
+        }
+      }
     }
 
-    return $branches;
+    foreach ($branches as $id => $branch) {
+      $branch->setRawFields(
+        array(
+          'closed' => (empty($open[$id])),
+        ));
+    }
+
+    return array_values($branches);
   }
 
 }
diff --git a/src/applications/repository/engine/PhabricatorRepositoryRefEngine.php b/src/applications/repository/engine/PhabricatorRepositoryRefEngine.php
index 153d7767a3..a393a6be69 100644
--- a/src/applications/repository/engine/PhabricatorRepositoryRefEngine.php
+++ b/src/applications/repository/engine/PhabricatorRepositoryRefEngine.php
@@ -19,6 +19,8 @@ final class PhabricatorRepositoryRefEngine
 
     $repository = $this->getRepository();
 
+    $branches_may_close = false;
+
     $vcs = $repository->getVersionControlSystem();
     switch ($vcs) {
       case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
@@ -31,6 +33,7 @@ final class PhabricatorRepositoryRefEngine
         $branches = $this->loadMercurialBranchPositions($repository);
         $bookmarks = $this->loadMercurialBookmarkPositions($repository);
         $tags = array();
+        $branches_may_close = true;
         break;
       case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
         $branches = $this->loadGitBranchPositions($repository);
@@ -87,6 +90,51 @@ final class PhabricatorRepositoryRefEngine
       $this->newRefs = array();
       $this->deadRefs = array();
     }
+
+    if ($branches && $branches_may_close) {
+      $this->updateBranchStates($repository, $branches);
+    }
+  }
+
+  private function updateBranchStates(
+    PhabricatorRepository $repository,
+    array $branches) {
+
+    assert_instances_of($branches, 'DiffusionRepositoryRef');
+
+    $all_cursors = id(new PhabricatorRepositoryRefCursorQuery())
+      ->setViewer(PhabricatorUser::getOmnipotentUser())
+      ->withRepositoryPHIDs(array($repository->getPHID()))
+      ->execute();
+
+    $state_map = array();
+    $type_branch = PhabricatorRepositoryRefCursor::TYPE_BRANCH;
+    foreach ($all_cursors as $cursor) {
+      if ($cursor->getRefType() !== $type_branch) {
+        continue;
+      }
+      $raw_name = $cursor->getRefNameRaw();
+      $hash = $cursor->getCommitIdentifier();
+
+      $state_map[$raw_name][$hash] = $cursor;
+    }
+
+    foreach ($branches as $branch) {
+      $cursor = idx($state_map, $branch->getShortName(), array());
+      $cursor = idx($cursor, $branch->getCommitIdentifier());
+      if (!$cursor) {
+        continue;
+      }
+
+      $fields = $branch->getRawFields();
+
+      $cursor_state = (bool)$cursor->getIsClosed();
+      $branch_state = (bool)idx($fields, 'closed');
+
+      if ($cursor_state != $branch_state) {
+        $cursor->setIsClosed((int)$branch_state)->save();
+      }
+    }
   }
 
   private function markRefNew(PhabricatorRepositoryRefCursor $cursor) {
diff --git a/src/applications/repository/storage/PhabricatorRepository.php b/src/applications/repository/storage/PhabricatorRepository.php
index 13ce78e54b..ae1b3a86ea 100644
--- a/src/applications/repository/storage/PhabricatorRepository.php
+++ b/src/applications/repository/storage/PhabricatorRepository.php
@@ -544,9 +544,22 @@ final class PhabricatorRepository extends PhabricatorRepositoryDAO
     // trusted, Mercurial prints out a warning to stdout, twice, after Feb 2011.
     //
     // http://selenic.com/pipermail/mercurial-devel/2011-February/028541.html
+    //
+    // After Jan 2015, it may also fail to write to a revision branch cache.
+
+    $ignore = array(
+      'ignoring untrusted configuration option',
+      "couldn't write revision branch cache:",
+    );
+
+    foreach ($ignore as $key => $pattern) {
+      $ignore[$key] = preg_quote($pattern, '/');
+    }
+
+    $ignore = '('.implode('|', $ignore).')';
 
     $lines = preg_split('/(?<=\n)/', $stdout);
-    $regex = '/ignoring untrusted configuration option .*\n$/';
+    $regex = '/'.$ignore.'.*\n$/';
 
     foreach ($lines as $key => $line) {
       $lines[$key] = preg_replace($regex, '', $line);
diff --git a/src/applications/repository/storage/PhabricatorRepositoryRefCursor.php b/src/applications/repository/storage/PhabricatorRepositoryRefCursor.php
index efdcdfc1ba..c7cdc21dbd 100644
--- a/src/applications/repository/storage/PhabricatorRepositoryRefCursor.php
+++ b/src/applications/repository/storage/PhabricatorRepositoryRefCursor.php
@@ -18,6 +18,7 @@ final class PhabricatorRepositoryRefCursor extends PhabricatorRepositoryDAO
   protected $refNameRaw;
   protected $refNameEncoding;
   protected $commitIdentifier;
+  protected $isClosed = 0;
 
   private $repository = self::ATTACHABLE;
 
@@ -35,6 +36,7 @@ final class PhabricatorRepositoryRefCursor extends PhabricatorRepositoryDAO
         // T6203/NULLABILITY
         // This probably should not be nullable; refNameRaw is not nullable.
         'refNameEncoding' => 'text16?',
+        'isClosed' => 'bool',
       ),
       self::CONFIG_KEY_SCHEMA => array(
         'key_cursor' => array(