diff --git a/src/applications/diffusion/conduit/DiffusionFileContentQueryConduitAPIMethod.php b/src/applications/diffusion/conduit/DiffusionFileContentQueryConduitAPIMethod.php
index 671ec3ef6f..61987b4d77 100644
--- a/src/applications/diffusion/conduit/DiffusionFileContentQueryConduitAPIMethod.php
+++ b/src/applications/diffusion/conduit/DiffusionFileContentQueryConduitAPIMethod.php
@@ -1,47 +1,63 @@
 <?php
 
 final class DiffusionFileContentQueryConduitAPIMethod
   extends DiffusionQueryConduitAPIMethod {
 
   public function getAPIMethodName() {
     return 'diffusion.filecontentquery';
   }
 
   public function getMethodDescription() {
     return pht('Retrieve file content from a repository.');
   }
 
   protected function defineReturnType() {
     return 'array';
   }
 
   protected function defineCustomParamTypes() {
     return array(
       'path' => 'required string',
       'commit' => 'required string',
       'needsBlame' => 'optional bool',
+      'timeout' => 'optional int',
+      'byteLimit' => 'optional int',
     );
   }
 
   protected function getResult(ConduitAPIRequest $request) {
     $drequest = $this->getDiffusionRequest();
     $needs_blame = $request->getValue('needsBlame');
     $file_query = DiffusionFileContentQuery::newFromDiffusionRequest(
       $drequest);
     $file_query
       ->setViewer($request->getUser())
       ->setNeedsBlame($needs_blame);
+
+    $timeout = $request->getValue('timeout');
+    if ($timeout) {
+      $file_query->setTimeout($timeout);
+    }
+
+    $byte_limit = $request->getValue('byteLimit');
+    if ($byte_limit) {
+      $file_query->setByteLimit($byte_limit);
+    }
+
     $file_content = $file_query->loadFileContent();
+
     if ($needs_blame) {
       list($text_list, $rev_list, $blame_dict) = $file_query->getBlameData();
     } else {
       $text_list = $rev_list = $blame_dict = array();
     }
+
     $file_content
       ->setBlameDict($blame_dict)
       ->setRevList($rev_list)
       ->setTextList($text_list);
+
     return $file_content->toDictionary();
   }
 
 }
diff --git a/src/applications/diffusion/controller/DiffusionBrowseFileController.php b/src/applications/diffusion/controller/DiffusionBrowseFileController.php
index c55d217bfe..f975984789 100644
--- a/src/applications/diffusion/controller/DiffusionBrowseFileController.php
+++ b/src/applications/diffusion/controller/DiffusionBrowseFileController.php
@@ -1,1102 +1,1134 @@
 <?php
 
 final class DiffusionBrowseFileController extends DiffusionBrowseController {
 
   private $lintCommit;
   private $lintMessages;
   private $coverage;
 
   protected function processDiffusionRequest(AphrontRequest $request) {
     $drequest = $this->getDiffusionRequest();
     $viewer = $request->getUser();
 
     $before = $request->getStr('before');
     if ($before) {
       return $this->buildBeforeResponse($before);
     }
 
     $path = $drequest->getPath();
 
     $preferences = $viewer->loadPreferences();
 
     $show_blame = $request->getBool(
       'blame',
       $preferences->getPreference(
         PhabricatorUserPreferences::PREFERENCE_DIFFUSION_BLAME,
         false));
     $show_color = $request->getBool(
       'color',
       $preferences->getPreference(
         PhabricatorUserPreferences::PREFERENCE_DIFFUSION_COLOR,
         true));
 
     $view = $request->getStr('view');
     if ($request->isFormPost() && $view != 'raw' && $viewer->isLoggedIn()) {
       $preferences->setPreference(
         PhabricatorUserPreferences::PREFERENCE_DIFFUSION_BLAME,
         $show_blame);
       $preferences->setPreference(
         PhabricatorUserPreferences::PREFERENCE_DIFFUSION_COLOR,
         $show_color);
       $preferences->save();
 
       $uri = $request->getRequestURI()
         ->alter('blame', null)
         ->alter('color', null);
 
       return id(new AphrontRedirectResponse())->setURI($uri);
     }
 
     // We need the blame information if blame is on and we're building plain
     // text, or blame is on and this is an Ajax request. If blame is on and
     // this is a colorized request, we don't show blame at first (we ajax it
     // in afterward) so we don't need to query for it.
     $needs_blame = ($show_blame && !$show_color) ||
                    ($show_blame && $request->isAjax());
 
+    $params = array(
+      'commit' => $drequest->getCommit(),
+      'path' => $drequest->getPath(),
+      'needsBlame' => $needs_blame,
+    );
+
+    $byte_limit = null;
+    if ($view !== 'raw') {
+      $byte_limit = PhabricatorFileStorageEngine::getChunkThreshold();
+      $time_limit = 10;
+
+      $params += array(
+        'timeout' => $time_limit,
+        'byteLimit' => $byte_limit,
+      );
+    }
+
     $file_content = DiffusionFileContent::newFromConduit(
       $this->callConduitWithDiffusionRequest(
         'diffusion.filecontentquery',
-        array(
-          'commit' => $drequest->getCommit(),
-          'path' => $drequest->getPath(),
-          'needsBlame' => $needs_blame,
-        )));
+        $params));
     $data = $file_content->getCorpus();
 
     if ($view === 'raw') {
       return $this->buildRawResponse($path, $data);
     }
 
     $this->loadLintMessages();
     $this->coverage = $drequest->loadCoverage();
 
-    $binary_uri = null;
-    if (ArcanistDiffUtils::isHeuristicBinaryFile($data)) {
+    if ($byte_limit && (strlen($data) == $byte_limit)) {
+      $corpus = $this->buildErrorCorpus(
+        pht(
+          'This file is larger than %s byte(s), and too large to display '.
+          'in the web UI.',
+          $byte_limit));
+    } else if (ArcanistDiffUtils::isHeuristicBinaryFile($data)) {
       $file = $this->loadFileForData($path, $data);
       $file_uri = $file->getBestURI();
 
       if ($file->isViewableImage()) {
         $corpus = $this->buildImageCorpus($file_uri);
       } else {
         $corpus = $this->buildBinaryCorpus($file_uri, $data);
-        $binary_uri = $file_uri;
       }
     } else {
       // Build the content of the file.
       $corpus = $this->buildCorpus(
         $show_blame,
         $show_color,
         $file_content,
         $needs_blame,
         $drequest,
         $path,
         $data);
     }
 
     if ($request->isAjax()) {
       return id(new AphrontAjaxResponse())->setContent($corpus);
     }
 
     require_celerity_resource('diffusion-source-css');
 
     // Render the page.
     $view = $this->buildActionView($drequest);
     $action_list = $this->enrichActionView(
       $view,
       $drequest,
       $show_blame,
       $show_color);
 
     $properties = $this->buildPropertyView($drequest, $action_list);
     $object_box = id(new PHUIObjectBoxView())
       ->setHeader($this->buildHeaderView($drequest))
       ->addPropertyList($properties);
 
     $content = array();
     $content[] = $object_box;
 
     $follow  = $request->getStr('follow');
     if ($follow) {
       $notice = new PHUIInfoView();
       $notice->setSeverity(PHUIInfoView::SEVERITY_WARNING);
       $notice->setTitle(pht('Unable to Continue'));
       switch ($follow) {
         case 'first':
           $notice->appendChild(
             pht(
               'Unable to continue tracing the history of this file because '.
               'this commit is the first commit in the repository.'));
           break;
         case 'created':
           $notice->appendChild(
             pht(
               'Unable to continue tracing the history of this file because '.
               'this commit created the file.'));
           break;
       }
       $content[] = $notice;
     }
 
     $renamed = $request->getStr('renamed');
     if ($renamed) {
       $notice = new PHUIInfoView();
       $notice->setSeverity(PHUIInfoView::SEVERITY_NOTICE);
       $notice->setTitle(pht('File Renamed'));
       $notice->appendChild(
         pht(
           "File history passes through a rename from '%s' to '%s'.",
           $drequest->getPath(), $renamed));
       $content[] = $notice;
     }
 
     $content[] = $corpus;
     $content[] = $this->buildOpenRevisions();
 
     $crumbs = $this->buildCrumbs(
       array(
         'branch' => true,
         'path'   => true,
         'view'   => 'browse',
       ));
 
     $basename = basename($this->getDiffusionRequest()->getPath());
 
     return $this->buildApplicationPage(
       array(
         $crumbs,
         $content,
       ),
       array(
         'title' => $basename,
       ));
   }
 
   private function loadLintMessages() {
     $drequest = $this->getDiffusionRequest();
     $branch = $drequest->loadBranch();
 
     if (!$branch || !$branch->getLintCommit()) {
       return;
     }
 
     $this->lintCommit = $branch->getLintCommit();
 
     $conn = id(new PhabricatorRepository())->establishConnection('r');
 
     $where = '';
     if ($drequest->getLint()) {
       $where = qsprintf(
         $conn,
         'AND code = %s',
         $drequest->getLint());
     }
 
     $this->lintMessages = queryfx_all(
       $conn,
       'SELECT * FROM %T WHERE branchID = %d %Q AND path = %s',
       PhabricatorRepository::TABLE_LINTMESSAGE,
       $branch->getID(),
       $where,
       '/'.$drequest->getPath());
   }
 
   private function buildCorpus(
     $show_blame,
     $show_color,
     DiffusionFileContent $file_content,
     $needs_blame,
     DiffusionRequest $drequest,
     $path,
     $data) {
 
     if (!$show_color) {
       $style =
         'border: none; width: 100%; height: 80em; font-family: monospace';
       if (!$show_blame) {
         $corpus = phutil_tag(
           'textarea',
           array(
             'style' => $style,
           ),
           $file_content->getCorpus());
       } else {
         $text_list = $file_content->getTextList();
         $rev_list = $file_content->getRevList();
         $blame_dict = $file_content->getBlameDict();
 
         $rows = array();
         foreach ($text_list as $k => $line) {
           $rev = $rev_list[$k];
           $author = $blame_dict[$rev]['author'];
           $rows[] =
             sprintf('%-10s %-20s %s', substr($rev, 0, 7), $author, $line);
         }
 
         $corpus = phutil_tag(
           'textarea',
           array(
             'style' => $style,
           ),
           implode("\n", $rows));
       }
     } else {
       require_celerity_resource('syntax-highlighting-css');
       $text_list = $file_content->getTextList();
       $rev_list = $file_content->getRevList();
       $blame_dict = $file_content->getBlameDict();
 
       $text_list = implode("\n", $text_list);
       $text_list = PhabricatorSyntaxHighlighter::highlightWithFilename(
         $path,
         $text_list);
       $text_list = explode("\n", $text_list);
 
       $rows = $this->buildDisplayRows($text_list, $rev_list, $blame_dict,
         $needs_blame, $drequest, $show_blame, $show_color);
 
       $corpus_table = javelin_tag(
         'table',
         array(
           'class' => 'diffusion-source remarkup-code PhabricatorMonospaced',
           'sigil' => 'phabricator-source',
         ),
         $rows);
 
       if ($this->getRequest()->isAjax()) {
         return $corpus_table;
       }
 
       $id = celerity_generate_unique_node_id();
 
       $repo = $drequest->getRepository();
       $symbol_repos = nonempty($repo->getSymbolSources(), array());
       $symbol_repos[] = $repo;
 
       $lang = last(explode('.', $drequest->getPath()));
       $repo_languages = $repo->getSymbolLanguages();
       $repo_languages = nonempty($repo_languages, array());
       $repo_languages = array_fill_keys($repo_languages, true);
 
       $needs_symbols = true;
       if ($repo_languages && $symbol_repos) {
         $have_symbols = id(new DiffusionSymbolQuery())
             ->existsSymbolsInRepository($repo->getPHID());
         if (!$have_symbols) {
           $needs_symbols = false;
         }
       }
 
       if ($needs_symbols && $repo_languages) {
         $needs_symbols = isset($repo_languages[$lang]);
       }
 
       if ($needs_symbols) {
         Javelin::initBehavior(
           'repository-crossreference',
           array(
             'container' => $id,
             'lang' => $lang,
             'repositories' => $symbol_repos,
           ));
       }
 
       $corpus = phutil_tag(
         'div',
         array(
           'id' => $id,
         ),
         $corpus_table);
 
       Javelin::initBehavior('load-blame', array('id' => $id));
     }
 
     $edit = $this->renderEditButton();
     $file = $this->renderFileButton();
     $header = id(new PHUIHeaderView())
       ->setHeader(pht('File Contents'))
       ->addActionLink($edit)
       ->addActionLink($file);
 
     $corpus = id(new PHUIObjectBoxView())
       ->setHeader($header)
       ->appendChild($corpus);
 
     return $corpus;
   }
 
   private function enrichActionView(
     PhabricatorActionListView $view,
     DiffusionRequest $drequest,
     $show_blame,
     $show_color) {
 
     $viewer = $this->getRequest()->getUser();
     $base_uri = $this->getRequest()->getRequestURI();
 
     $view->addAction(
       id(new PhabricatorActionView())
         ->setName(pht('Show Last Change'))
         ->setHref(
           $drequest->generateURI(
             array(
               'action' => 'change',
             )))
         ->setIcon('fa-backward'));
 
     if ($show_blame) {
       $blame_text = pht('Disable Blame');
       $blame_icon = 'fa-exclamation-circle lightgreytext';
       $blame_value = 0;
     } else {
       $blame_text = pht('Enable Blame');
       $blame_icon = 'fa-exclamation-circle';
       $blame_value = 1;
     }
 
     $view->addAction(
       id(new PhabricatorActionView())
         ->setName($blame_text)
         ->setHref($base_uri->alter('blame', $blame_value))
         ->setIcon($blame_icon)
         ->setUser($viewer)
         ->setRenderAsForm($viewer->isLoggedIn()));
 
     if ($show_color) {
       $highlight_text = pht('Disable Highlighting');
       $highlight_icon = 'fa-star-o grey';
       $highlight_value = 0;
     } else {
       $highlight_text = pht('Enable Highlighting');
       $highlight_icon = 'fa-star';
       $highlight_value = 1;
     }
 
     $view->addAction(
       id(new PhabricatorActionView())
         ->setName($highlight_text)
         ->setHref($base_uri->alter('color', $highlight_value))
         ->setIcon($highlight_icon)
         ->setUser($viewer)
         ->setRenderAsForm($viewer->isLoggedIn()));
 
     $href = null;
     if ($this->getRequest()->getStr('lint') !== null) {
       $lint_text = pht('Hide %d Lint Message(s)', count($this->lintMessages));
       $href = $base_uri->alter('lint', null);
 
     } else if ($this->lintCommit === null) {
       $lint_text = pht('Lint not Available');
     } else {
       $lint_text = pht(
         'Show %d Lint Message(s)',
         count($this->lintMessages));
       $href = $this->getDiffusionRequest()->generateURI(array(
         'action' => 'browse',
         'commit' => $this->lintCommit,
       ))->alter('lint', '');
     }
 
     $view->addAction(
       id(new PhabricatorActionView())
         ->setName($lint_text)
         ->setHref($href)
         ->setIcon('fa-exclamation-triangle')
         ->setDisabled(!$href));
 
     return $view;
   }
 
   private function renderEditButton() {
     $request = $this->getRequest();
     $user = $request->getUser();
 
     $drequest = $this->getDiffusionRequest();
 
     $repository = $drequest->getRepository();
     $path = $drequest->getPath();
     $line = nonempty((int)$drequest->getLine(), 1);
 
     $callsign = $repository->getCallsign();
     $editor_link = $user->loadEditorLink($path, $line, $callsign);
     $template = $user->loadEditorLink($path, '%l', $callsign);
 
     $icon_edit = id(new PHUIIconView())
       ->setIconFont('fa-pencil');
     $button = id(new PHUIButtonView())
       ->setTag('a')
       ->setText(pht('Open in Editor'))
       ->setHref($editor_link)
       ->setIcon($icon_edit)
       ->setID('editor_link')
       ->setMetadata(array('link_template' => $template))
       ->setDisabled(!$editor_link);
 
     return $button;
   }
 
   private function renderFileButton($file_uri = null) {
 
     $base_uri = $this->getRequest()->getRequestURI();
 
     if ($file_uri) {
       $text = pht('Download Raw File');
       $href = $file_uri;
       $icon = 'fa-download';
     } else {
       $text = pht('View Raw File');
       $href = $base_uri->alter('view', 'raw');
       $icon = 'fa-file-text';
     }
 
     $iconview = id(new PHUIIconView())
       ->setIconFont($icon);
     $button = id(new PHUIButtonView())
       ->setTag('a')
       ->setText($text)
       ->setHref($href)
       ->setIcon($iconview);
 
     return $button;
   }
 
 
   private function buildDisplayRows(
     array $text_list,
     array $rev_list,
     array $blame_dict,
     $needs_blame,
     DiffusionRequest $drequest,
     $show_blame,
     $show_color) {
 
     $handles = array();
     if ($blame_dict) {
       $epoch_list  = ipull(ifilter($blame_dict, 'epoch'), 'epoch');
       $epoch_min   = min($epoch_list);
       $epoch_max   = max($epoch_list);
       $epoch_range = ($epoch_max - $epoch_min) + 1;
 
       $author_phids = ipull(ifilter($blame_dict, 'authorPHID'), 'authorPHID');
       $handles = $this->loadViewerHandles($author_phids);
     }
 
     $line_arr = array();
     $line_str = $drequest->getLine();
     $ranges = explode(',', $line_str);
     foreach ($ranges as $range) {
       if (strpos($range, '-') !== false) {
         list($min, $max) = explode('-', $range, 2);
         $line_arr[] = array(
           'min' => min($min, $max),
           'max' => max($min, $max),
         );
       } else if (strlen($range)) {
         $line_arr[] = array(
           'min' => $range,
           'max' => $range,
         );
       }
     }
 
     $display = array();
 
     $line_number = 1;
     $last_rev = null;
     $color = null;
     foreach ($text_list as $k => $line) {
       $display_line = array(
         'epoch'       => null,
         'commit'      => null,
         'author'      => null,
         'target'      => null,
         'highlighted' => null,
         'line'        => $line_number,
         'data'        => $line,
       );
 
       if ($show_blame) {
         // If the line's rev is same as the line above, show empty content
         // with same color; otherwise generate blame info. The newer a change
         // is, the more saturated the color.
 
         $rev = idx($rev_list, $k, $last_rev);
 
         if ($last_rev == $rev) {
           $display_line['color'] = $color;
         } else {
           $blame = $blame_dict[$rev];
 
           if (!isset($blame['epoch'])) {
             $color = '#ffd'; // Render as warning.
           } else {
             $color_ratio = ($blame['epoch'] - $epoch_min) / $epoch_range;
             $color_value = 0xE6 * (1.0 - $color_ratio);
             $color = sprintf(
               '#%02x%02x%02x',
               $color_value,
               0xF6,
               $color_value);
           }
 
           $display_line['epoch'] = idx($blame, 'epoch');
           $display_line['color'] = $color;
           $display_line['commit'] = $rev;
 
           $author_phid = idx($blame, 'authorPHID');
           if ($author_phid && $handles[$author_phid]) {
             $author_link = $handles[$author_phid]->renderLink();
           } else {
             $author_link = $blame['author'];
           }
           $display_line['author'] = $author_link;
 
           $last_rev = $rev;
         }
       }
 
       if ($line_arr) {
         if ($line_number == $line_arr[0]['min']) {
           $display_line['target'] = true;
         }
         foreach ($line_arr as $range) {
           if ($line_number >= $range['min'] &&
               $line_number <= $range['max']) {
             $display_line['highlighted'] = true;
           }
         }
       }
 
       $display[] = $display_line;
       ++$line_number;
     }
 
     $request = $this->getRequest();
     $viewer = $request->getUser();
 
     $commits = array_filter(ipull($display, 'commit'));
     if ($commits) {
       $commits = id(new DiffusionCommitQuery())
         ->setViewer($viewer)
         ->withRepository($drequest->getRepository())
         ->withIdentifiers($commits)
         ->execute();
       $commits = mpull($commits, null, 'getCommitIdentifier');
     }
 
     $revision_ids = id(new DifferentialRevision())
       ->loadIDsByCommitPHIDs(mpull($commits, 'getPHID'));
     $revisions = array();
     if ($revision_ids) {
       $revisions = id(new DifferentialRevisionQuery())
         ->setViewer($viewer)
         ->withIDs($revision_ids)
         ->execute();
     }
 
     $phids = array();
     foreach ($commits as $commit) {
       if ($commit->getAuthorPHID()) {
         $phids[] = $commit->getAuthorPHID();
       }
     }
     foreach ($revisions as $revision) {
       if ($revision->getAuthorPHID()) {
         $phids[] = $revision->getAuthorPHID();
       }
     }
     $handles = $this->loadViewerHandles($phids);
 
     Javelin::initBehavior('phabricator-oncopy', array());
 
     $engine = null;
     $inlines = array();
     if ($this->getRequest()->getStr('lint') !== null && $this->lintMessages) {
       $engine = new PhabricatorMarkupEngine();
       $engine->setViewer($viewer);
 
       foreach ($this->lintMessages as $message) {
         $inline = id(new PhabricatorAuditInlineComment())
           ->setSyntheticAuthor(
             ArcanistLintSeverity::getStringForSeverity($message['severity']).
             ' '.$message['code'].' ('.$message['name'].')')
           ->setLineNumber($message['line'])
           ->setContent($message['description']);
         $inlines[$message['line']][] = $inline;
 
         $engine->addObject(
           $inline,
           PhabricatorInlineCommentInterface::MARKUP_FIELD_BODY);
       }
 
       $engine->process();
       require_celerity_resource('differential-changeset-view-css');
     }
 
     $rows = $this->renderInlines(
       idx($inlines, 0, array()),
       $show_blame,
       (bool)$this->coverage,
       $engine);
 
     foreach ($display as $line) {
 
       $line_href = $drequest->generateURI(
         array(
           'action'  => 'browse',
           'line'    => $line['line'],
           'stable'  => true,
         ));
 
       $blame = array();
       $style = null;
       if (array_key_exists('color', $line)) {
         if ($line['color']) {
           $style = 'background: '.$line['color'].';';
         }
 
         $before_link = null;
         $commit_link = null;
         $revision_link = null;
         if (idx($line, 'commit')) {
           $commit = $line['commit'];
 
           if (idx($commits, $commit)) {
             $tooltip = $this->renderCommitTooltip(
               $commits[$commit],
               $handles,
               $line['author']);
           } else {
             $tooltip = null;
           }
 
           Javelin::initBehavior('phabricator-tooltips', array());
           require_celerity_resource('aphront-tooltip-css');
 
           $commit_link = javelin_tag(
             'a',
             array(
               'href' => $drequest->generateURI(
                 array(
                   'action' => 'commit',
                   'commit' => $line['commit'],
                 )),
               'sigil' => 'has-tooltip',
               'meta'  => array(
                 'tip'   => $tooltip,
                 'align' => 'E',
                 'size'  => 600,
               ),
             ),
             id(new PhutilUTF8StringTruncator())
             ->setMaximumGlyphs(9)
             ->setTerminator('')
             ->truncateString($line['commit']));
 
           $revision_id = null;
           if (idx($commits, $commit)) {
             $revision_id = idx($revision_ids, $commits[$commit]->getPHID());
           }
 
           if ($revision_id) {
             $revision = idx($revisions, $revision_id);
             if ($revision) {
               $tooltip = $this->renderRevisionTooltip($revision, $handles);
               $revision_link = javelin_tag(
                 'a',
                 array(
                   'href' => '/D'.$revision->getID(),
                   'sigil' => 'has-tooltip',
                   'meta'  => array(
                     'tip'   => $tooltip,
                     'align' => 'E',
                     'size'  => 600,
                   ),
                 ),
                 'D'.$revision->getID());
             }
           }
 
           $uri = $line_href->alter('before', $commit);
           $before_link = javelin_tag(
             'a',
             array(
               'href'  => $uri->setQueryParam('view', 'blame'),
               'sigil' => 'has-tooltip',
               'meta'  => array(
                 'tip'     => pht('Skip Past This Commit'),
                 'align'   => 'E',
                 'size'    => 300,
               ),
             ),
             "\xC2\xAB");
         }
 
         $blame[] = phutil_tag(
           'th',
           array(
             'class' => 'diffusion-blame-link',
           ),
           $before_link);
 
         $object_links = array();
         $object_links[] = $commit_link;
         if ($revision_link) {
           $object_links[] = phutil_tag('span', array(), '/');
           $object_links[] = $revision_link;
         }
 
         $blame[] = phutil_tag(
           'th',
           array(
             'class' => 'diffusion-rev-link',
           ),
           $object_links);
       }
 
       $line_link = phutil_tag(
         'a',
         array(
           'href' => $line_href,
           'style' => $style,
         ),
         $line['line']);
 
       $blame[] = javelin_tag(
         'th',
         array(
           'class' => 'diffusion-line-link',
           'sigil' => 'phabricator-source-line',
           'style' => $style,
         ),
         $line_link);
 
       Javelin::initBehavior('phabricator-line-linker');
 
       if ($line['target']) {
         Javelin::initBehavior(
           'diffusion-jump-to',
           array(
             'target' => 'scroll_target',
           ));
         $anchor_text = phutil_tag(
           'a',
           array(
             'id' => 'scroll_target',
           ),
           '');
       } else {
         $anchor_text = null;
       }
 
       $blame[] = phutil_tag(
         'td',
         array(
         ),
         array(
           $anchor_text,
 
           // NOTE: See phabricator-oncopy behavior.
           "\xE2\x80\x8B",
 
           // TODO: [HTML] Not ideal.
           phutil_safe_html(str_replace("\t", '  ', $line['data'])),
         ));
 
       if ($this->coverage) {
         require_celerity_resource('differential-changeset-view-css');
         $cov_index = $line['line'] - 1;
 
         if (isset($this->coverage[$cov_index])) {
           $cov_class = $this->coverage[$cov_index];
         } else {
           $cov_class = 'N';
         }
 
         $blame[] = phutil_tag(
           'td',
           array(
             'class' => 'cov cov-'.$cov_class,
           ),
           '');
       }
 
       $rows[] = phutil_tag(
         'tr',
         array(
           'class' => ($line['highlighted'] ?
                       'phabricator-source-highlight' :
                       null),
         ),
         $blame);
 
       $cur_inlines = $this->renderInlines(
         idx($inlines, $line['line'], array()),
         $show_blame,
         $this->coverage,
         $engine);
       foreach ($cur_inlines as $cur_inline) {
         $rows[] = $cur_inline;
       }
     }
 
     return $rows;
   }
 
   private function renderInlines(
     array $inlines,
     $needs_blame,
     $has_coverage,
     $engine) {
 
     $rows = array();
     foreach ($inlines as $inline) {
 
       // TODO: This should use modern scaffolding code.
 
       $inline_view = id(new PHUIDiffInlineCommentDetailView())
         ->setUser($this->getViewer())
         ->setMarkupEngine($engine)
         ->setInlineComment($inline)
         ->render();
 
       $row = array_fill(0, ($needs_blame ? 3 : 1), phutil_tag('th'));
 
       $row[] = phutil_tag('td', array(), $inline_view);
 
       if ($has_coverage) {
         $row[] = phutil_tag(
           'td',
           array(
             'class' => 'cov cov-I',
           ));
       }
 
       $rows[] = phutil_tag('tr', array('class' => 'inline'), $row);
     }
 
     return $rows;
   }
 
   private function loadFileForData($path, $data) {
     $file = PhabricatorFile::buildFromFileDataOrHash(
       $data,
       array(
         'name' => basename($path),
         'ttl' => time() + 60 * 60 * 24,
         'viewPolicy' => PhabricatorPolicies::POLICY_NOONE,
       ));
 
     $unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
       $file->attachToObject(
         $this->getDiffusionRequest()->getRepository()->getPHID());
     unset($unguarded);
 
     return $file;
   }
 
   private function buildRawResponse($path, $data) {
     $file = $this->loadFileForData($path, $data);
     return $file->getRedirectResponse();
   }
 
   private function buildImageCorpus($file_uri) {
     $properties = new PHUIPropertyListView();
 
     $properties->addImageContent(
       phutil_tag(
         'img',
         array(
           'src' => $file_uri,
         )));
 
     $file = $this->renderFileButton($file_uri);
     $header = id(new PHUIHeaderView())
       ->setHeader(pht('Image'))
       ->addActionLink($file);
 
     return id(new PHUIObjectBoxView())
       ->setHeader($header)
       ->addPropertyList($properties);
   }
 
   private function buildBinaryCorpus($file_uri, $data) {
 
     $size = new PhutilNumber(strlen($data));
     $text = pht('This is a binary file. It is %s byte(s) in length.', $size);
     $text = id(new PHUIBoxView())
       ->addPadding(PHUI::PADDING_LARGE)
       ->appendChild($text);
 
     $file = $this->renderFileButton($file_uri);
     $header = id(new PHUIHeaderView())
       ->setHeader(pht('Details'))
       ->addActionLink($file);
 
     $box = id(new PHUIObjectBoxView())
       ->setHeader($header)
       ->appendChild($text);
 
     return $box;
   }
 
+  private function buildErrorCorpus($message) {
+    $text = id(new PHUIBoxView())
+      ->addPadding(PHUI::PADDING_LARGE)
+      ->appendChild($message);
+
+    $header = id(new PHUIHeaderView())
+      ->setHeader(pht('Details'));
+
+    $box = id(new PHUIObjectBoxView())
+      ->setHeader($header)
+      ->appendChild($text);
+
+    return $box;
+  }
+
   private function buildBeforeResponse($before) {
     $request = $this->getRequest();
     $drequest = $this->getDiffusionRequest();
 
     // NOTE: We need to get the grandparent so we can capture filename changes
     // in the parent.
 
     $parent = $this->loadParentCommitOf($before);
     $old_filename = null;
     $was_created = false;
     if ($parent) {
       $grandparent = $this->loadParentCommitOf($parent);
 
       if ($grandparent) {
         $rename_query = new DiffusionRenameHistoryQuery();
         $rename_query->setRequest($drequest);
         $rename_query->setOldCommit($grandparent);
         $rename_query->setViewer($request->getUser());
         $old_filename = $rename_query->loadOldFilename();
         $was_created = $rename_query->getWasCreated();
       }
     }
 
     $follow = null;
     if ($was_created) {
       // If the file was created in history, that means older commits won't
       // have it. Since we know it existed at 'before', it must have been
       // created then; jump there.
       $target_commit = $before;
       $follow = 'created';
     } else if ($parent) {
       // If we found a parent, jump to it. This is the normal case.
       $target_commit = $parent;
     } else {
       // If there's no parent, this was probably created in the initial commit?
       // And the "was_created" check will fail because we can't identify the
       // grandparent. Keep the user at 'before'.
       $target_commit = $before;
       $follow = 'first';
     }
 
     $path = $drequest->getPath();
     $renamed = null;
     if ($old_filename !== null &&
         $old_filename !== '/'.$path) {
       $renamed = $path;
       $path = $old_filename;
     }
 
     $line = null;
     // If there's a follow error, drop the line so the user sees the message.
     if (!$follow) {
       $line = $this->getBeforeLineNumber($target_commit);
     }
 
     $before_uri = $drequest->generateURI(
       array(
         'action'    => 'browse',
         'commit'    => $target_commit,
         'line'      => $line,
         'path'      => $path,
       ));
 
     $before_uri->setQueryParams($request->getRequestURI()->getQueryParams());
     $before_uri = $before_uri->alter('before', null);
     $before_uri = $before_uri->alter('renamed', $renamed);
     $before_uri = $before_uri->alter('follow', $follow);
 
     return id(new AphrontRedirectResponse())->setURI($before_uri);
   }
 
   private function getBeforeLineNumber($target_commit) {
     $drequest = $this->getDiffusionRequest();
 
     $line = $drequest->getLine();
     if (!$line) {
       return null;
     }
 
     $raw_diff = $this->callConduitWithDiffusionRequest(
       'diffusion.rawdiffquery',
       array(
         'commit' => $drequest->getCommit(),
         'path' => $drequest->getPath(),
         'againstCommit' => $target_commit,
       ));
     $old_line = 0;
     $new_line = 0;
 
     foreach (explode("\n", $raw_diff) as $text) {
       if ($text[0] == '-' || $text[0] == ' ') {
         $old_line++;
       }
       if ($text[0] == '+' || $text[0] == ' ') {
         $new_line++;
       }
       if ($new_line == $line) {
         return $old_line;
       }
     }
 
     // We didn't find the target line.
     return $line;
   }
 
   private function loadParentCommitOf($commit) {
     $drequest = $this->getDiffusionRequest();
     $user = $this->getRequest()->getUser();
 
     $before_req = DiffusionRequest::newFromDictionary(
       array(
         'user' => $user,
         'repository' => $drequest->getRepository(),
         'commit' => $commit,
       ));
 
     $parents = DiffusionQuery::callConduitWithDiffusionRequest(
       $user,
       $before_req,
       'diffusion.commitparentsquery',
       array(
         'commit' => $commit,
       ));
 
     return head($parents);
   }
 
   private function renderRevisionTooltip(
     DifferentialRevision $revision,
     array $handles) {
     $viewer = $this->getRequest()->getUser();
 
     $date = phabricator_date($revision->getDateModified(), $viewer);
     $id = $revision->getID();
     $title = $revision->getTitle();
     $header = "D{$id} {$title}";
 
     $author = $handles[$revision->getAuthorPHID()]->getName();
 
     return "{$header}\n{$date} \xC2\xB7 {$author}";
   }
 
   private function renderCommitTooltip(
     PhabricatorRepositoryCommit $commit,
     array $handles,
     $author) {
 
     $viewer = $this->getRequest()->getUser();
 
     $date = phabricator_date($commit->getEpoch(), $viewer);
     $summary = trim($commit->getSummary());
 
     if ($commit->getAuthorPHID()) {
       $author = $handles[$commit->getAuthorPHID()]->getName();
     }
 
     return "{$summary}\n{$date} \xC2\xB7 {$author}";
   }
 
 }
diff --git a/src/applications/diffusion/query/filecontent/DiffusionFileContentQuery.php b/src/applications/diffusion/query/filecontent/DiffusionFileContentQuery.php
index 2f3493737a..9664d98f07 100644
--- a/src/applications/diffusion/query/filecontent/DiffusionFileContentQuery.php
+++ b/src/applications/diffusion/query/filecontent/DiffusionFileContentQuery.php
@@ -1,155 +1,199 @@
 <?php
 
 /**
  * NOTE: this class should only be used where local access to the repository
  * is guaranteed and NOT from within the Diffusion application. Diffusion
  * should use Conduit method 'diffusion.filecontentquery' to get this sort
  * of data.
  */
 abstract class DiffusionFileContentQuery extends DiffusionQuery {
 
   private $needsBlame;
   private $fileContent;
   private $viewer;
+  private $timeout;
+  private $byteLimit;
+
+  public function setTimeout($timeout) {
+    $this->timeout = $timeout;
+    return $this;
+  }
+
+  public function getTimeout() {
+    return $this->timeout;
+  }
+
+  public function setByteLimit($byte_limit) {
+    $this->byteLimit = $byte_limit;
+    return $this;
+  }
+
+  public function getByteLimit() {
+    return $this->byteLimit;
+  }
 
   final public static function newFromDiffusionRequest(
     DiffusionRequest $request) {
     return parent::newQueryObject(__CLASS__, $request);
   }
 
   abstract public function getFileContentFuture();
   abstract protected function executeQueryFromFuture(Future $future);
 
   final public function loadFileContentFromFuture(Future $future) {
-    $this->fileContent = $this->executeQueryFromFuture($future);
+
+    if ($this->timeout) {
+      $future->setTimeout($this->timeout);
+    }
+
+    if ($this->getByteLimit()) {
+      $future->setStdoutSizeLimit($this->getByteLimit());
+    }
+
+    try {
+      $file_content = $this->executeQueryFromFuture($future);
+    } catch (CommandException $ex) {
+      if (!$future->getWasKilledByTimeout()) {
+        throw $ex;
+      }
+
+      $message = pht(
+        '<Attempt to load this file was terminated after %s second(s).>',
+        $this->timeout);
+
+      $file_content = new DiffusionFileContent();
+      $file_content->setCorpus($message);
+    }
+
+    $this->fileContent = $file_content;
 
     $repository = $this->getRequest()->getRepository();
     $try_encoding = $repository->getDetail('encoding');
     if ($try_encoding) {
         $this->fileContent->setCorpus(
           phutil_utf8_convert(
             $this->fileContent->getCorpus(), 'UTF-8', $try_encoding));
     }
 
     return $this->fileContent;
   }
 
   final protected function executeQuery() {
     return $this->loadFileContentFromFuture($this->getFileContentFuture());
   }
 
   final public function loadFileContent() {
     return $this->executeQuery();
   }
 
   final public function getRawData() {
     return $this->fileContent->getCorpus();
   }
 
   /**
    * Pretty hairy function. If getNeedsBlame is false, this returns
    *
    *   ($text_list, array(), array())
    *
    * Where $text_list is the raw file content with trailing new lines stripped.
    *
    * If getNeedsBlame is true, this returns
    *
    *   ($text_list, $line_rev_dict, $blame_dict)
    *
    * Where $text_list is just the lines of code -- the raw file content will
    * contain lots of blame data, $line_rev_dict is a dictionary of line number
    * => revision id, and $blame_dict is another complicated data structure.
    * In detail, $blame_dict contains [revision id][author] keys, as well
    * as [commit id][authorPhid] and [commit id][epoch] keys.
    *
    * @return ($text_list, $line_rev_dict, $blame_dict)
    */
   final public function getBlameData() {
     $raw_data = preg_replace('/\n$/', '', $this->getRawData());
 
     $text_list = array();
     $line_rev_dict = array();
     $blame_dict = array();
 
     if (!$this->getNeedsBlame()) {
       $text_list = explode("\n", $raw_data);
     } else if ($raw_data != '') {
       $lines = array();
       foreach (explode("\n", $raw_data) as $k => $line) {
         $lines[$k] = $this->tokenizeLine($line);
 
         list($rev_id, $author, $text) = $lines[$k];
         $text_list[$k] = $text;
         $line_rev_dict[$k] = $rev_id;
       }
 
       $line_rev_dict = $this->processRevList($line_rev_dict);
 
       foreach ($lines as $k => $line) {
         list($rev_id, $author, $text) = $line;
         $rev_id = $line_rev_dict[$k];
 
         if (!isset($blame_dict[$rev_id])) {
           $blame_dict[$rev_id]['author'] = $author;
         }
       }
 
       $repository = $this->getRequest()->getRepository();
 
       $commits = id(new DiffusionCommitQuery())
         ->setViewer($this->getViewer())
         ->withDefaultRepository($repository)
         ->withIdentifiers(array_unique($line_rev_dict))
         ->execute();
 
       foreach ($commits as $commit) {
         $blame_dict[$commit->getCommitIdentifier()]['epoch'] =
           $commit->getEpoch();
       }
 
       if ($commits) {
         $commits_data = id(new PhabricatorRepositoryCommitData())->loadAllWhere(
           'commitID IN (%Ls)',
           mpull($commits, 'getID'));
 
         foreach ($commits_data as $data) {
           $author_phid = $data->getCommitDetail('authorPHID');
           if (!$author_phid) {
             continue;
           }
           $commit = $commits[$data->getCommitID()];
           $commit_identifier = $commit->getCommitIdentifier();
           $blame_dict[$commit_identifier]['authorPHID'] = $author_phid;
         }
       }
 
    }
 
     return array($text_list, $line_rev_dict, $blame_dict);
   }
 
   abstract protected function tokenizeLine($line);
 
   public function setNeedsBlame($needs_blame) {
     $this->needsBlame = $needs_blame;
     return $this;
   }
 
   public function getNeedsBlame() {
     return $this->needsBlame;
   }
 
   public function setViewer(PhabricatorUser $user) {
     $this->viewer = $user;
     return $this;
   }
 
   public function getViewer() {
     return $this->viewer;
   }
 
   protected function processRevList(array $rev_list) {
     return $rev_list;
   }
 }