Pubsub: Restrict full pending builds states to 25 per builder (from 75)

scripts/master/pubsub_json_status_push.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import base64
 import collections
 import datetime
 import functools
 import json
 import os
@@ skipping 354 matching lines @@
     * builders: List of builders (builbot.status.builder.Builder).
     * slaves: List of slaves (buildbot.status.slave).
     """
     builders = {builder_name: self._status.getBuilder(builder_name)
                 for builder_name in self._status.getBuilderNames()}
     builder_infos = {}
     for name, builder in builders.iteritems():
       # This requires a deferred call since the data is queried from
       # the postgres DB (sigh).
       pending = yield builder.getPendingBuildRequestStatuses()
-      # Optimization cheat: only get the first 75 pending builds.
-      # This caps the amount of postgres db calls for really out of
-      # control builders
-      pending = pending[:75]
+      # Optimization cheat: only get the first 25 pending builds.
+      # This caps the amount of postgres db calls and json size for really out
+      # of control builders
+      pending = pending[:25]
       pendingStates = yield defer.DeferredList(
           [p.asDict_async() for p in pending])
       # Not included: basedir, cachedBuilds.
       # cachedBuilds isn't useful and takes a ton of resources to compute.
       builder_info = {
         'slaves': builder.slavenames,
         'currentBuilds': sorted(b.getNumber() for b in builder.currentBuilds),
         'pendingBuilds': len(pending),
         # p is a tuple of (success, payload)
         'pendingBuildStates': [p[1] for p in pendingStates if p[0]],
@@ skipping 34 matching lines @@
     return self
 
   @event_handler
   def stepStarted(self, build, _step):
     # This info is included in the master json.
     return self
 
   @event_handler
   def buildFinished(self, _builderName, build, _results):
     self._recordBuild(build)