Merge "Allow to remove specific scores while leaving the reviewer listed"
diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index c9bea0a..af0daf4 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -897,7 +897,7 @@
 Default is "Submit all ${topicSize} changes of the same topic (${submitSize}
 changes including ancestors and other changes related by topic)".
 
-[[change.submitWholeTopic]]change.submitWholeTopic::
+[[change.submitWholeTopic]]change.submitWholeTopic (*Experimental*)::
 +
 Determines if the submit button submits the whole topic instead of
 just the current change.
@@ -1404,7 +1404,8 @@
 httpd and sshd threads as some request processing code paths may
 need multiple connections.
 +
-Default is 8.
+Default is <<sshd.threads, sshd.threads>>
+ + <<httpd.maxThreads, httpd.maxThreads>> + 2.
 +
 This setting only applies if
 <<database.connectionPool,database.connectionPool>> is true.
@@ -1422,7 +1423,7 @@
 Maximum number of connections to keep idle in the pool.  If there
 are more idle connections, connections will be closed instead of
 being returned back to the pool.
-Default is 4.
+Default is min(<<database.poolLimit, database.poolLimit>>, 16).
 +
 This setting only applies if
 <<database.connectionPool,database.connectionPool>> is true.
@@ -3142,6 +3143,8 @@
 +
 A size of 0 bytes disables rules, same as rules.enable = false.
 +
+Common unit suffixes of 'k', 'm', or 'g' are supported.
++
 Default is 128 KiB.
 
 [[rules.maxPrologDatabaseSize]]rules.maxPrologDatabaseSize::
@@ -3429,7 +3432,7 @@
 If additional requests are received while all threads are busy they
 are queued and serviced in a first-come-first-served order.
 +
-By default, 1.5x the number of CPUs available to the JVM.
+By default, 2x the number of CPUs available to the JVM.
 
 [[sshd.batchThreads]]sshd.batchThreads::
 +
diff --git a/Documentation/dev-plugins.txt b/Documentation/dev-plugins.txt
index e6bf2a4..13b6978 100644
--- a/Documentation/dev-plugins.txt
+++ b/Documentation/dev-plugins.txt
@@ -283,6 +283,7 @@
     private final ConsoleUI ui;
     private final AllProjectsConfig allProjectsConfig;
 
+    @Inject
     public MyInitStep(@PluginName String pluginName, ConsoleUI ui,
         AllProjectsConfig allProjectsConfig) {
       this.pluginName = pluginName;
diff --git a/Documentation/rest-api-changes.txt b/Documentation/rest-api-changes.txt
index 0b853c0..07d3cc3 100644
--- a/Documentation/rest-api-changes.txt
+++ b/Documentation/rest-api-changes.txt
@@ -224,7 +224,7 @@
 * `ALL_REVISIONS`: describe all revisions, not just current.
 --
 
-[[download_commands]]
+[[download-commands]]
 --
 * `DOWNLOAD_COMMANDS`: include the `commands` field in the
   link:#fetch-info[FetchInfo] for revisions. Only valid when the
@@ -1104,7 +1104,7 @@
   blocked by Verified
 ----
 
-[[submitted_together]]
+[[submitted-together]]
 === Changes submitted together
 --
 'GET /changes/link:#change-id[\{change-id\}]/submitted_together'
@@ -4307,7 +4307,7 @@
 |`commands`    |optional|
 The download commands for this patch set as a map that maps the command
 names to the commands. +
-Only set if link:#download_commands[download commands] are requested.
+Only set if link:#download-commands[download commands] are requested.
 |==========================
 
 [[file-info]]
diff --git a/ReleaseNotes/ReleaseNotes-2.12.txt b/ReleaseNotes/ReleaseNotes-2.12.txt
index 4bfe90d..1dfba72 100644
--- a/ReleaseNotes/ReleaseNotes-2.12.txt
+++ b/ReleaseNotes/ReleaseNotes-2.12.txt
@@ -35,7 +35,7 @@
 This release includes the following new features. See the sections below for
 further details.
 
-* New "Submit Whole Topic" / "Submitted Together" workflow.
+* New change submission workflows, "Submit Whole Topic" and "Submitted Together".
 
 * Support for GPG Keys and signed pushes.
 
@@ -43,8 +43,8 @@
 New Features
 ------------
 
-New Change Submission Workflow
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+New Change Submission Workflows
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 * New "Submit Whole Topic" setting.
 +
@@ -53,7 +53,7 @@
 `change.submitWholeTopic`] setting is enabled, all changes belonging to the same
 topic will be submitted at the same time.
 +
-This setting is disabled by default.
+This setting should be considered experimental, and is disabled by default.
 
 * Submission of changes may include ancestors.
 +
@@ -297,7 +297,7 @@
 
 * Upgrade Jetty to 9.2.13.v20150730
 
-* Upgrade JGit to 4.1.0.201509280440-r
+* Upgrade JGit to 4.1.1.201511131810-r
 
 * Upgrade joda-time to 2.8
 
diff --git a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/BuckUtils.java b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/BuckUtils.java
index a182663..0b4a02e 100644
--- a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/BuckUtils.java
+++ b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/BuckUtils.java
@@ -14,9 +14,9 @@
 
 package com.google.gerrit.httpd.raw;
 
+import static com.google.common.base.MoreObjects.firstNonNull;
 import static java.nio.charset.StandardCharsets.UTF_8;
 
-import com.google.common.base.MoreObjects;
 import com.google.common.escape.Escaper;
 import com.google.common.html.HtmlEscapers;
 import com.google.common.io.ByteStreams;
@@ -27,12 +27,12 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.io.FileInputStream;
-import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InterruptedIOException;
 import java.io.PrintWriter;
+import java.nio.file.Files;
+import java.nio.file.NoSuchFileException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.Properties;
@@ -47,7 +47,7 @@
       throws IOException, BuildFailureException {
     log.info("buck build " + target);
     Properties properties = loadBuckProperties(gen);
-    String buck = MoreObjects.firstNonNull(properties.getProperty("buck"), "buck");
+    String buck = firstNonNull(properties.getProperty("buck"), "buck");
     ProcessBuilder proc = new ProcessBuilder(buck, "build", target)
         .directory(root.toFile())
         .redirectErrorStream(true);
@@ -77,12 +77,13 @@
     log.info(String.format("UPDATED    %s in %.3fs", target, time / 1000.0));
   }
 
-  private static Properties loadBuckProperties(Path gen)
-      throws FileNotFoundException, IOException {
+  private static Properties loadBuckProperties(Path gen) throws IOException {
     Properties properties = new Properties();
-    try (InputStream in = new FileInputStream(
-        gen.resolve(Paths.get("tools/buck/buck.properties")).toFile())) {
+    Path p = gen.resolve(Paths.get("tools/buck/buck.properties"));
+    try (InputStream in = Files.newInputStream(p)) {
       properties.load(in);
+    } catch (NoSuchFileException e) {
+      // Ignore; will be run from PATH, with a descriptive error if it fails.
     }
     return properties;
   }
diff --git a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/ResourceServlet.java b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/ResourceServlet.java
index 2036f83..c6eece2 100644
--- a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/ResourceServlet.java
+++ b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/ResourceServlet.java
@@ -136,28 +136,25 @@
     }
 
     Resource r = cache.getIfPresent(p);
-    if (r == null && maybeStream(p, req, rsp)) {
+    try {
+      if (r == null) {
+        if (maybeStream(p, req, rsp)) {
+          return; // Bypass cache for large resource.
+        }
+        r = cache.get(p, newLoader(p));
+      }
+      if (refresh && r.isStale(p, this)) {
+        cache.invalidate(p);
+        r = cache.get(p, newLoader(p));
+      }
+    } catch (ExecutionException e) {
+      log.warn("Cannot load static resource " + req.getPathInfo(), e);
+      CacheHeaders.setNotCacheable(rsp);
+      rsp.setStatus(SC_INTERNAL_SERVER_ERROR);
       return;
     }
-
-    if (r == null) {
-      Callable<Resource> loader = newLoader(p);
-      try {
-        r = cache.get(p, loader);
-        if (refresh && r.isStale(p, this)) {
-          cache.invalidate(p);
-          r = cache.get(p, loader);
-        }
-      } catch (ExecutionException | IOException e) {
-        log.warn("Cannot load static resource " + req.getPathInfo(), e);
-        CacheHeaders.setNotCacheable(rsp);
-        rsp.setStatus(SC_INTERNAL_SERVER_ERROR);
-        return;
-      }
-    }
-
     if (r == Resource.NOT_FOUND) {
-      notFound(rsp);
+      notFound(rsp); // Cached not found response.
       return;
     }
 
diff --git a/gerrit-openid/BUCK b/gerrit-openid/BUCK
index 78abce8..0a6363b 100644
--- a/gerrit-openid/BUCK
+++ b/gerrit-openid/BUCK
@@ -3,6 +3,9 @@
   srcs = glob(['src/main/java/**/*.java']),
   resources = glob(['src/main/resources/**/*']),
   deps = [
+    '//lib/openid:consumer',
+  ],
+  provided_deps = [
     '//gerrit-common:annotations',
     '//gerrit-common:server',
     '//gerrit-extension-api:api',
@@ -12,13 +15,12 @@
     '//gerrit-server:server',
     '//lib:guava',
     '//lib:gwtorm',
+    '//lib:servlet-api-3_1',
     '//lib/commons:codec',
     '//lib/guice:guice',
     '//lib/guice:guice-servlet',
     '//lib/jgit:jgit',
     '//lib/log:api',
-    '//lib/openid:consumer',
   ],
-  provided_deps = ['//lib:servlet-api-3_1'],
   visibility = ['PUBLIC'],
 )
diff --git a/gerrit-pgm/src/main/java/com/google/gerrit/pgm/http/jetty/JettyServer.java b/gerrit-pgm/src/main/java/com/google/gerrit/pgm/http/jetty/JettyServer.java
index 0684650..adfea594 100644
--- a/gerrit-pgm/src/main/java/com/google/gerrit/pgm/http/jetty/JettyServer.java
+++ b/gerrit-pgm/src/main/java/com/google/gerrit/pgm/http/jetty/JettyServer.java
@@ -23,6 +23,7 @@
 import com.google.gerrit.reviewdb.client.AuthType;
 import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.gerrit.server.config.SitePaths;
+import com.google.gerrit.server.config.ThreadSettingsConfig;
 import com.google.inject.Inject;
 import com.google.inject.Injector;
 import com.google.inject.Singleton;
@@ -127,11 +128,14 @@
   private boolean reverseProxy;
 
   @Inject
-  JettyServer(@GerritServerConfig final Config cfg, final SitePaths site,
-      final JettyEnv env, final HttpLogFactory httpLogFactory) {
+  JettyServer(@GerritServerConfig Config cfg,
+      ThreadSettingsConfig threadSettingsConfig,
+      SitePaths site,
+      JettyEnv env,
+      HttpLogFactory httpLogFactory) {
     this.site = site;
 
-    httpd = new Server(threadPool(cfg));
+    httpd = new Server(threadPool(cfg, threadSettingsConfig));
     httpd.setConnectors(listen(httpd, cfg));
 
     Handler app = makeContext(env, cfg);
@@ -315,8 +319,8 @@
     return site.resolve(path);
   }
 
-  private ThreadPool threadPool(Config cfg) {
-    int maxThreads = cfg.getInt("httpd", null, "maxthreads", 25);
+  private ThreadPool threadPool(Config cfg, ThreadSettingsConfig threadSettingsConfig) {
+    int maxThreads = threadSettingsConfig.getHttpdMaxThreads();
     int minThreads = cfg.getInt("httpd", null, "minthreads", 5);
     int maxQueued = cfg.getInt("httpd", null, "maxqueued", 200);
     int idleTimeout = (int)MILLISECONDS.convert(60, SECONDS);
diff --git a/gerrit-pgm/src/main/java/com/google/gerrit/pgm/util/SiteLibraryBasedDataSourceProvider.java b/gerrit-pgm/src/main/java/com/google/gerrit/pgm/util/SiteLibraryBasedDataSourceProvider.java
index 7f6313d..6443e21 100644
--- a/gerrit-pgm/src/main/java/com/google/gerrit/pgm/util/SiteLibraryBasedDataSourceProvider.java
+++ b/gerrit-pgm/src/main/java/com/google/gerrit/pgm/util/SiteLibraryBasedDataSourceProvider.java
@@ -18,6 +18,7 @@
 import com.google.gerrit.metrics.MetricMaker;
 import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.gerrit.server.config.SitePaths;
+import com.google.gerrit.server.config.ThreadSettingsConfig;
 import com.google.gerrit.server.schema.DataSourceProvider;
 import com.google.gerrit.server.schema.DataSourceType;
 import com.google.inject.Inject;
@@ -39,9 +40,10 @@
   SiteLibraryBasedDataSourceProvider(SitePaths site,
       @GerritServerConfig Config cfg,
       MetricMaker metrics,
+      ThreadSettingsConfig tsc,
       DataSourceProvider.Context ctx,
       DataSourceType dst) {
-    super(cfg, metrics, ctx, dst);
+    super(cfg, metrics, tsc, ctx, dst);
     libdir = site.lib_dir;
   }
 
diff --git a/gerrit-pgm/src/main/java/com/google/gerrit/pgm/util/ThreadLimiter.java b/gerrit-pgm/src/main/java/com/google/gerrit/pgm/util/ThreadLimiter.java
index 44361aa..dfe0403 100644
--- a/gerrit-pgm/src/main/java/com/google/gerrit/pgm/util/ThreadLimiter.java
+++ b/gerrit-pgm/src/main/java/com/google/gerrit/pgm/util/ThreadLimiter.java
@@ -15,7 +15,7 @@
 package com.google.gerrit.pgm.util;
 
 import com.google.gerrit.server.config.GerritServerConfig;
-import com.google.gerrit.server.schema.DataSourceProvider;
+import com.google.gerrit.server.config.ThreadSettingsConfig;
 import com.google.gerrit.server.schema.DataSourceType;
 import com.google.inject.Injector;
 import com.google.inject.Key;
@@ -34,14 +34,15 @@
     return limitThreads(
         dbInjector.getInstance(Key.get(Config.class, GerritServerConfig.class)),
         dbInjector.getInstance(DataSourceType.class),
+        dbInjector.getInstance(ThreadSettingsConfig.class),
         threads);
   }
 
-  private static int limitThreads(Config cfg, DataSourceType dst, int threads) {
+  private static int limitThreads(Config cfg, DataSourceType dst,
+      ThreadSettingsConfig threadSettingsConfig, int threads) {
     boolean usePool = cfg.getBoolean("database", "connectionpool",
         dst.usePool());
-    int poolLimit = cfg.getInt("database", "poollimit",
-        DataSourceProvider.DEFAULT_POOL_LIMIT);
+    int poolLimit = threadSettingsConfig.getDatabasePoolLimit();
     if (usePool && threads > poolLimit) {
       log.warn("Limiting program to " + poolLimit
           + " threads due to database.poolLimit");
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/config/ThreadSettingsConfig.java b/gerrit-server/src/main/java/com/google/gerrit/server/config/ThreadSettingsConfig.java
new file mode 100644
index 0000000..c62583e
--- /dev/null
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/config/ThreadSettingsConfig.java
@@ -0,0 +1,55 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.config;
+
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+
+import org.eclipse.jgit.lib.Config;
+
+@Singleton
+public class ThreadSettingsConfig {
+  private final int sshdThreads;
+  private final int httpdMaxThreads;
+  private final int sshdBatchThreads;
+  private final int databasePoolLimit;
+
+  @Inject
+  ThreadSettingsConfig(@GerritServerConfig Config cfg) {
+    int cores = Runtime.getRuntime().availableProcessors();
+    sshdThreads = cfg.getInt("sshd", "threads", 2 * cores);
+    httpdMaxThreads = cfg.getInt("httpd", "maxThreads", 25);
+    int defaultDatabasePoolLimit = sshdThreads + httpdMaxThreads + 2;
+    databasePoolLimit =
+        cfg.getInt("database", "poolLimit", defaultDatabasePoolLimit);
+    sshdBatchThreads = cores == 1 ? 1 : 2;
+  }
+
+  public int getDatabasePoolLimit() {
+    return databasePoolLimit;
+  }
+
+  public int getHttpdMaxThreads() {
+    return httpdMaxThreads;
+  }
+
+  public int getSshdThreads() {
+    return sshdThreads;
+  }
+
+  public int getSshdBatchTreads() {
+    return sshdBatchThreads;
+  }
+}
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/git/MergeOp.java b/gerrit-server/src/main/java/com/google/gerrit/server/git/MergeOp.java
index a2d71fb..e809e67 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/git/MergeOp.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/git/MergeOp.java
@@ -888,6 +888,7 @@
             break;
 
           case PATH_CONFLICT:
+          case REBASE_MERGE_CONFLICT:
           case MANUAL_RECURSIVE_MERGE:
           case CANNOT_CHERRY_PICK_ROOT:
           case NOT_FAST_FORWARD:
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/git/ScanningChangeCacheImpl.java b/gerrit-server/src/main/java/com/google/gerrit/server/git/ScanningChangeCacheImpl.java
index 19e23b7..faf3776 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/git/ScanningChangeCacheImpl.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/git/ScanningChangeCacheImpl.java
@@ -26,6 +26,7 @@
 import com.google.gerrit.server.cache.CacheModule;
 import com.google.gerrit.server.util.ManualRequestContext;
 import com.google.gerrit.server.util.OneOffRequestContext;
+import com.google.gwtorm.server.OrmException;
 import com.google.inject.Inject;
 import com.google.inject.Module;
 import com.google.inject.Singleton;
@@ -37,6 +38,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.LinkedHashSet;
@@ -97,25 +99,29 @@
     public List<Change> load(Project.NameKey key) throws Exception {
       try (Repository repo = repoManager.openRepository(key);
           ManualRequestContext ctx = requestContext.open()) {
-        ReviewDb db = ctx.getReviewDbProvider().get();
-        Map<String, Ref> refs =
-            repo.getRefDatabase().getRefs(RefNames.REFS_CHANGES);
-        Set<Change.Id> ids = new LinkedHashSet<>();
-        for (Ref r : refs.values()) {
-          Change.Id id = Change.Id.fromRef(r.getName());
-          if (id != null) {
-            ids.add(id);
-          }
-        }
-        List<Change> changes = new ArrayList<>(ids.size());
-         // A batch size of N may overload get(Iterable), so use something smaller,
-         // but still >1.
-        for (List<Change.Id> batch : Iterables.partition(ids, 30)) {
-          Iterables.addAll(changes, db.changes().get(batch));
-        }
-        return changes;
+        return scan(repo, ctx.getReviewDbProvider().get());
       }
     }
 
   }
+
+  public static List<Change> scan(Repository repo, ReviewDb db)
+      throws OrmException, IOException {
+    Map<String, Ref> refs =
+        repo.getRefDatabase().getRefs(RefNames.REFS_CHANGES);
+    Set<Change.Id> ids = new LinkedHashSet<>();
+    for (Ref r : refs.values()) {
+      Change.Id id = Change.Id.fromRef(r.getName());
+      if (id != null) {
+        ids.add(id);
+      }
+    }
+    List<Change> changes = new ArrayList<>(ids.size());
+    // A batch size of N may overload get(Iterable), so use something smaller,
+    // but still >1.
+    for (List<Change.Id> batch : Iterables.partition(ids, 30)) {
+      Iterables.addAll(changes, db.changes().get(batch));
+    }
+    return changes;
+  }
 }
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/index/ReindexAfterUpdate.java b/gerrit-server/src/main/java/com/google/gerrit/server/index/ReindexAfterUpdate.java
index 31fbb40..9d573e1 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/index/ReindexAfterUpdate.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/index/ReindexAfterUpdate.java
@@ -69,6 +69,11 @@
 
   @Override
   public void onGitReferenceUpdated(final Event event) {
+    if (event.getRefName().startsWith(RefNames.REFS_CHANGES)
+        || event.getRefName().startsWith(RefNames.REFS_DRAFT_COMMENTS)
+        || event.getRefName().startsWith(RefNames.REFS_USERS)) {
+      return;
+    }
     Futures.transformAsync(
         executor.submit(new GetChanges(event)),
         new AsyncFunction<List<Change>, List<Void>>() {
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/index/SiteIndexer.java b/gerrit-server/src/main/java/com/google/gerrit/server/index/SiteIndexer.java
index 1bc6b05..53af8ad 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/index/SiteIndexer.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/index/SiteIndexer.java
@@ -33,11 +33,11 @@
 import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.reviewdb.server.ReviewDb;
 import com.google.gerrit.server.config.GerritServerConfig;
-import com.google.gerrit.server.git.ChangeCache;
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.git.MergeUtil;
 import com.google.gerrit.server.git.MultiProgressMonitor;
 import com.google.gerrit.server.git.MultiProgressMonitor.Task;
+import com.google.gerrit.server.git.ScanningChangeCacheImpl;
 import com.google.gerrit.server.patch.PatchListLoader;
 import com.google.gerrit.server.query.change.ChangeData;
 import com.google.gwtorm.server.SchemaFactory;
@@ -112,7 +112,6 @@
   }
 
   private final SchemaFactory<ReviewDb> schemaFactory;
-  private final ChangeCache changeCache;
   private final ChangeData.Factory changeDataFactory;
   private final GitRepositoryManager repoManager;
   private final ListeningExecutorService executor;
@@ -126,14 +125,12 @@
 
   @Inject
   SiteIndexer(SchemaFactory<ReviewDb> schemaFactory,
-      ChangeCache changeCache,
       ChangeData.Factory changeDataFactory,
       GitRepositoryManager repoManager,
       @IndexExecutor(BATCH) ListeningExecutorService executor,
       ChangeIndexer.Factory indexerFactory,
       @GerritServerConfig Config config) {
     this.schemaFactory = schemaFactory;
-    this.changeCache = changeCache;
     this.changeDataFactory = changeDataFactory;
     this.repoManager = repoManager;
     this.executor = executor;
@@ -241,7 +238,7 @@
         try (Repository repo = repoManager.openRepository(project);
             ReviewDb db = schemaFactory.open()) {
           Map<String, Ref> refs = repo.getRefDatabase().getRefs(ALL);
-          for (Change c : changeCache.get(project)) {
+          for (Change c : ScanningChangeCacheImpl.scan(repo, db)) {
             Ref r = refs.get(c.currentPatchSetId().toRefName());
             if (r != null) {
               byId.put(r.getObjectId(), changeDataFactory.create(db, c));
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/schema/DataSourceProvider.java b/gerrit-server/src/main/java/com/google/gerrit/server/schema/DataSourceProvider.java
index e0482f9..0c3bf67 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/schema/DataSourceProvider.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/schema/DataSourceProvider.java
@@ -27,6 +27,7 @@
 import com.google.gerrit.server.config.ConfigSection;
 import com.google.gerrit.server.config.ConfigUtil;
 import com.google.gerrit.server.config.GerritServerConfig;
+import com.google.gerrit.server.config.ThreadSettingsConfig;
 import com.google.gwtorm.jdbc.SimpleDataSource;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
@@ -47,21 +48,22 @@
 @Singleton
 public class DataSourceProvider implements Provider<DataSource>,
     LifecycleListener {
-  public static final int DEFAULT_POOL_LIMIT = 8;
-
   private final Config cfg;
   private final MetricMaker metrics;
   private final Context ctx;
   private final DataSourceType dst;
+  private final ThreadSettingsConfig threadSettingsConfig;
   private DataSource ds;
 
   @Inject
   protected DataSourceProvider(@GerritServerConfig Config cfg,
       MetricMaker metrics,
+      ThreadSettingsConfig threadSettingsConfig,
       Context ctx,
       DataSourceType dst) {
     this.cfg = cfg;
     this.metrics = metrics;
+    this.threadSettingsConfig = threadSettingsConfig;
     this.ctx = ctx;
     this.dst = dst;
   }
@@ -127,9 +129,11 @@
       if (password != null && !password.isEmpty()) {
         ds.setPassword(password);
       }
-      ds.setMaxActive(cfg.getInt("database", "poollimit", DEFAULT_POOL_LIMIT));
+      int poolLimit = threadSettingsConfig.getDatabasePoolLimit();
+      ds.setMaxActive(poolLimit);
       ds.setMinIdle(cfg.getInt("database", "poolminidle", 4));
-      ds.setMaxIdle(cfg.getInt("database", "poolmaxidle", 4));
+      ds.setMaxIdle(
+          cfg.getInt("database", "poolmaxidle", Math.min(poolLimit, 16)));
       ds.setMaxWait(ConfigUtil.getTimeUnit(cfg, "database", null,
           "poolmaxwait", MILLISECONDS.convert(30, SECONDS), MILLISECONDS));
       ds.setInitialSize(ds.getMinIdle());
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/schema/Schema_108.java b/gerrit-server/src/main/java/com/google/gerrit/server/schema/Schema_108.java
index cfafb37..4e76325 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/schema/Schema_108.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/schema/Schema_108.java
@@ -14,14 +14,17 @@
 
 package com.google.gerrit.server.schema;
 
+import com.google.common.base.Joiner;
 import com.google.common.collect.ArrayListMultimap;
 import com.google.common.collect.HashMultimap;
 import com.google.common.collect.Multimap;
 import com.google.common.collect.SetMultimap;
+import com.google.common.collect.Sets;
 import com.google.gerrit.reviewdb.client.Change;
 import com.google.gerrit.reviewdb.client.Change.Status;
 import com.google.gerrit.reviewdb.client.PatchSet;
 import com.google.gerrit.reviewdb.client.Project;
+import com.google.gerrit.reviewdb.client.Project.NameKey;
 import com.google.gerrit.reviewdb.client.RefNames;
 import com.google.gerrit.reviewdb.server.ReviewDb;
 import com.google.gerrit.server.git.GitRepositoryManager;
@@ -44,6 +47,7 @@
 import java.util.Collection;
 import java.util.Map;
 import java.util.Set;
+import java.util.SortedSet;
 
 public class Schema_108 extends SchemaVersion {
   private final GitRepositoryManager repoManager;
@@ -59,7 +63,7 @@
   protected void migrateData(ReviewDb db, UpdateUI ui) throws OrmException {
     ui.message("Listing all changes ...");
     SetMultimap<Project.NameKey, Change.Id> openByProject =
-        getOpenChangesByProject(db);
+        getOpenChangesByProject(db, ui);
     ui.message("done");
 
     ui.message("Updating groups for open changes ...");
@@ -140,7 +144,9 @@
   }
 
   private SetMultimap<Project.NameKey, Change.Id> getOpenChangesByProject(
-      ReviewDb db) throws OrmException {
+      ReviewDb db, UpdateUI ui) throws OrmException {
+    SortedSet<NameKey> projects = repoManager.list();
+    SortedSet<NameKey> nonExistentProjects = Sets.newTreeSet();
     SetMultimap<Project.NameKey, Change.Id> openByProject =
         HashMultimap.create();
     for (Change c : db.changes().all()) {
@@ -149,10 +155,22 @@
         continue;
       }
 
-      // The old "submitted" state is not supported anymore
-      // (thus status is null) but it was an opened state and needs
-      // to be migrated as such
-      openByProject.put(c.getProject(), c.getId());
+      NameKey projectKey = c.getProject();
+      if (!projects.contains(projectKey)) {
+        nonExistentProjects.add(projectKey);
+      } else {
+        // The old "submitted" state is not supported anymore
+        // (thus status is null) but it was an opened state and needs
+        // to be migrated as such
+        openByProject.put(projectKey, c.getId());
+      }
+    }
+
+    if (!nonExistentProjects.isEmpty()) {
+      ui.message("Detected open changes referring to the following non-existent projects:");
+      ui.message(Joiner.on(", ").join(nonExistentProjects));
+      ui.message("It is highly recommended to remove\n"
+          + "the obsolete open changes, comments and patch-sets from your DB.\n");
     }
     return openByProject;
   }
diff --git a/gerrit-server/src/main/resources/com/google/gerrit/server/tools/root/hooks/commit-msg b/gerrit-server/src/main/resources/com/google/gerrit/server/tools/root/hooks/commit-msg
index 6988459..5370156 100644
--- a/gerrit-server/src/main/resources/com/google/gerrit/server/tools/root/hooks/commit-msg
+++ b/gerrit-server/src/main/resources/com/google/gerrit/server/tools/root/hooks/commit-msg
@@ -63,6 +63,10 @@
 		AWK=/usr/xpg4/bin/awk
 	fi
 
+	# Get core.commentChar from git config or use default symbol
+	commentChar=`git config --get core.commentChar`
+	commentChar=${commentChar:-#}
+
 	# How this works:
 	# - parse the commit message as (textLine+ blankLine*)*
 	# - assume textLine+ to be a footer until proven otherwise
@@ -81,8 +85,8 @@
 		blankLines = 0
 	}
 
-	# Skip lines starting with "#" without any spaces before it.
-	/^#/ { next }
+	# Skip lines starting with commentChar without any spaces before it.
+	/^'"$commentChar"'/ { next }
 
 	# Skip the line starting with the diff command and everything after it,
 	# up to the end of the file, assuming it is only patch data.
diff --git a/gerrit-sshd/src/main/java/com/google/gerrit/sshd/CommandExecutorQueueProvider.java b/gerrit-sshd/src/main/java/com/google/gerrit/sshd/CommandExecutorQueueProvider.java
index f78aba4..88e1142 100644
--- a/gerrit-sshd/src/main/java/com/google/gerrit/sshd/CommandExecutorQueueProvider.java
+++ b/gerrit-sshd/src/main/java/com/google/gerrit/sshd/CommandExecutorQueueProvider.java
@@ -15,6 +15,7 @@
 package com.google.gerrit.sshd;
 
 import com.google.gerrit.server.config.GerritServerConfig;
+import com.google.gerrit.server.config.ThreadSettingsConfig;
 import com.google.gerrit.server.git.QueueProvider;
 import com.google.gerrit.server.git.WorkQueue;
 import com.google.inject.Inject;
@@ -31,11 +32,13 @@
   private final WorkQueue.Executor batchExecutor;
 
   @Inject
-  public CommandExecutorQueueProvider(@GerritServerConfig final Config config,
-      final WorkQueue queues) {
-    final int cores = Runtime.getRuntime().availableProcessors();
-    poolSize = config.getInt("sshd", "threads", 3 * cores / 2);
-    batchThreads = config.getInt("sshd", "batchThreads", cores == 1 ? 1 : 2);
+  public CommandExecutorQueueProvider(
+      @GerritServerConfig Config config,
+      ThreadSettingsConfig threadsSettingsConfig,
+      WorkQueue queues) {
+    poolSize = threadsSettingsConfig.getSshdThreads();
+    batchThreads = config.getInt("sshd", "batchThreads",
+        threadsSettingsConfig.getSshdBatchTreads());
     if (batchThreads > poolSize) {
       poolSize += batchThreads;
     }
diff --git a/lib/jgit/BUCK b/lib/jgit/BUCK
index 9cdfbf4..837d347 100644
--- a/lib/jgit/BUCK
+++ b/lib/jgit/BUCK
@@ -1,13 +1,13 @@
 include_defs('//lib/maven.defs')
 
 REPO = MAVEN_CENTRAL # Leave here even if set to MAVEN_CENTRAL.
-VERS = '4.1.0.201509280440-r'
+VERS = '4.1.1.201511131810-r'
 
 maven_jar(
   name = 'jgit',
   id = 'org.eclipse.jgit:org.eclipse.jgit:' + VERS,
-  bin_sha1 = '6410f290b796184df95d321a18d4c3665ba542a8',
-  src_sha1 = 'a681c59ec854b3e55f3abff8442e3e4ece31fa70',
+  bin_sha1 = '17cf7d0cb7da8bbcc16e43f0ab5dbfc43b5cb539',
+  src_sha1 = 'e65acfcdca36ae3cbdcbd5496648612eebe54be7',
   license = 'jgit',
   repository = REPO,
   unsign = True,
@@ -22,7 +22,7 @@
 maven_jar(
   name = 'jgit-servlet',
   id = 'org.eclipse.jgit:org.eclipse.jgit.http.server:' + VERS,
-  sha1 = '2f86ccebd5b5e0837757d35f63f04471432c13b8',
+  sha1 = '3bbeaab1ddfd87319c4938145c9c2c276ec8de17',
   license = 'jgit',
   repository = REPO,
   deps = [':jgit'],
@@ -36,7 +36,7 @@
 maven_jar(
   name = 'jgit-archive',
   id = 'org.eclipse.jgit:org.eclipse.jgit.archive:' + VERS,
-  sha1 = 'd6d0ec8d77cea3b7efeac9789140f8373c10454b',
+  sha1 = 'aae0cc90ab568182bdd1cb5a32bee5b44780e1a7',
   license = 'jgit',
   repository = REPO,
   deps = [':jgit',
@@ -53,7 +53,7 @@
 maven_jar(
   name = 'junit',
   id = 'org.eclipse.jgit:org.eclipse.jgit.junit:' + VERS,
-  sha1 = '69ef53175d9f150bc4072f8f5ba9046bf14cc55f',
+  sha1 = '63fd8d96849c7c20d5c70c91575ff8dda12718e0',
   license = 'DO_NOT_DISTRIBUTE',
   repository = REPO,
   unsign = True,
diff --git a/polygerrit-ui/app/elements/gr-account-dropdown.html b/polygerrit-ui/app/elements/gr-account-dropdown.html
new file mode 100644
index 0000000..fbc9a68
--- /dev/null
+++ b/polygerrit-ui/app/elements/gr-account-dropdown.html
@@ -0,0 +1,61 @@
+<!--
+Copyright (C) 2015 The Android Open Source Project
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+
+<link rel="import" href="../bower_components/polymer/polymer.html">
+
+<dom-module id="gr-account-dropdown">
+  <template>
+    <style>
+      :not(.loggedIn):not(.loggedOut) .loginButton,
+      :not(.loggedIn):not(.loggedOut) .logoutButton,
+      .loggedIn .loginButton,
+      .loggedOut .logoutButton {
+        display: none;
+      }
+    </style>
+    <div class$="[[_computeContainerClass(account)]]">
+      <a class="loginButton" href="/login" on-tap="_loginTapHandler">Login</a>
+      <a class="logoutButton" href="/logout">Logout</a>
+    </div>
+  </template>
+  <script>
+  (function() {
+    'use strict';
+
+    Polymer({
+      is: 'gr-account-dropdown',
+
+      properties: {
+        account: Object,
+      },
+
+      _loginTapHandler: function(e) {
+        e.preventDefault();
+        page('/login/' + encodeURIComponent(
+            window.location.pathname + window.location.hash));
+      },
+
+      _computeContainerClass: function(account) {
+        if (Object.keys(account).length == 0) {
+          return 'loggedOut';
+        }
+        return 'loggedIn';
+      },
+
+    });
+  })();
+  </script>
+</dom-module>
diff --git a/polygerrit-ui/app/elements/gr-account-manager.html b/polygerrit-ui/app/elements/gr-account-manager.html
new file mode 100644
index 0000000..10b6052
--- /dev/null
+++ b/polygerrit-ui/app/elements/gr-account-manager.html
@@ -0,0 +1,60 @@
+<!--
+Copyright (C) 2015 The Android Open Source Project
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+
+<link rel="import" href="../bower_components/polymer/polymer.html">
+
+<dom-module id="gr-account-manager">
+  <template>
+    <iron-ajax id="xhr"
+        auto
+        url="/accounts/self/detail"
+        json-prefix=")]}'"></iron-ajax>
+  </template>
+  <script>
+  (function() {
+    'use strict';
+
+    Polymer({
+      is: 'gr-account-manager',
+
+      hostAttributes: {
+        hidden: true
+      },
+
+      properties: {
+        account: {
+          type: Object,
+          notify: true,
+        },
+      },
+
+      listeners: {
+        'xhr.response': '_handleResponse',
+        'xhr.error': '_handleResponse',
+      },
+
+      _handleResponse: function(e, req) {
+        if (req.status >= 200 && req.status < 300) {
+          this.account = req.response;
+        } else {
+          this.account = {};
+        }
+      },
+
+    });
+  })();
+  </script>
+</dom-module>
diff --git a/polygerrit-ui/app/elements/gr-app.html b/polygerrit-ui/app/elements/gr-app.html
index 3007585..9f1ed1a 100644
--- a/polygerrit-ui/app/elements/gr-app.html
+++ b/polygerrit-ui/app/elements/gr-app.html
@@ -16,6 +16,8 @@
 
 <link rel="import" href="../bower_components/polymer/polymer.html">
 <link rel="import" href="../styles/app-theme.html">
+<link rel="import" href="gr-account-dropdown.html">
+<link rel="import" href="gr-account-manager.html">
 <link rel="import" href="gr-change-list-view.html">
 <link rel="import" href="gr-change-view.html">
 <link rel="import" href="gr-diff-view.html">
@@ -56,7 +58,7 @@
       .bigTitle:hover {
         text-decoration: underline;
       }
-      .searchContainer {
+      .headerRightItems {
         display: flex;
         flex: 1;
         justify-content: flex-end;
@@ -64,11 +66,18 @@
       gr-search-bar {
         width: 500px;
       }
+      gr-account-dropdown {
+        align-items: center;
+        display: flex;
+        margin-left: var(--default-horizontal-margin);
+      }
     </style>
+    <gr-account-manager account="{{account}}"></gr-account-manager>
     <header role="banner">
       <a href="/" class="bigTitle">PolyGerrit</a>
-      <div class="searchContainer">
+      <div class="headerRightItems">
         <gr-search-bar value="{{params.query}}" role="search"></gr-search-bar>
+        <gr-account-dropdown account="[[account]]"></gr-account-dropdown>
       </div>
     </header>
     <main>
@@ -92,6 +101,7 @@
       is: 'gr-app',
 
       properties: {
+        account: Object,
         constrained: {
           type: Boolean,
           value: false,
diff --git a/polygerrit-ui/app/elements/gr-diff-view.html b/polygerrit-ui/app/elements/gr-diff-view.html
index 502b2df..874cbd0 100644
--- a/polygerrit-ui/app/elements/gr-diff-view.html
+++ b/polygerrit-ui/app/elements/gr-diff-view.html
@@ -23,41 +23,41 @@
       :host {
         background-color: var(--view-background-color);
         display: block;
-        margin: 1em 1.25rem;
       }
       h3 {
-        border-bottom: 1px solid #eee;
-        padding: .75em 1em;
+        margin-top: 1em;
+        padding: .75em var(--default-horizontal-margin);
       }
       .mainContainer {
-        max-width: 100%;
-        overflow: auto;
+        border-bottom: 1px solid #eee;
+        border-collapse: collapse;
+        border-top: 1px solid #eee;
+        width: 100%;
+      }
+      .diffNumbers,
+      .diffContent {
+        vertical-align: top;
       }
       .diffContainer {
-        display: flex;
         font-family: 'Source Code Pro', monospace;
         white-space: pre;
       }
       .diffNumbers {
-        background-color: #ddd;
+        background-color: #eee;
         color: #666;
         padding: 0 .75em;
         text-align: right;
       }
       .diffContent {
-        border-right: 1px solid #ddd;
-        min-width: calc(80ch + 2px);
-        overflow-x: auto;
-        padding-left: 2px;
-        width: calc(80ch + 2px);
+        min-width: 80ch;
+        max-width: 120ch;
+        overflow: hidden;
       }
       .diffContainer.leftOnly .diffContent,
       .diffContainer.rightOnly .diffContent {
         overflow: visible;
       }
-      .diffContainer.leftOnly .right {
-        display: none;
-      }
+      .diffContainer.leftOnly .right,
       .diffContainer.rightOnly .left {
         display: none;
       }
@@ -129,14 +129,14 @@
       <a href$="[[_computeChangePath(_changeNum)]]">[[_changeNum]]</a><span>:</span>
       <span>[[_change.subject]]</span> — <span>[[params.path]]</span>
     </h3>
-    <div class="mainContainer">
-      <div class="diffContainer" id="diffContainer">
-        <div class="diffNumbers left" id="leftDiffNumbers"></div>
-        <div class="diffContent left" id="leftDiffContent"></div>
-        <div class="diffNumbers right" id="rightDiffNumbers"></div>
-        <div class="diffContent right" id="rightDiffContent"></div>
-      </div>
-    </div>
+    <table class="mainContainer">
+      <tr class="diffContainer" id="diffContainer">
+        <td class="diffNumbers left" id="leftDiffNumbers"></td>
+        <td class="diffContent left" id="leftDiffContent"></td>
+        <td class="diffNumbers right" id="rightDiffNumbers"></td>
+        <td class="diffContent right" id="rightDiffContent"></td>
+      </tr>
+    </table>
   </template>
   <script>
   (function() {
@@ -362,7 +362,7 @@
         this.$.diffContainer.classList.toggle('rightOnly',
             diff.change_type == Changes.DiffType.ADDED);
         this.$.diffContainer.classList.toggle('leftOnly',
-            diff.change_type == Changes.DiffType.REMOVED);
+            diff.change_type == Changes.DiffType.DELETED);
 
         var initialLineNum = 0 + (diff.content.skip || 0);
         var ctx = {
diff --git a/polygerrit-ui/app/scripts/app.js b/polygerrit-ui/app/scripts/app.js
index 7014074..7f3e05c 100644
--- a/polygerrit-ui/app/scripts/app.js
+++ b/polygerrit-ui/app/scripts/app.js
@@ -18,10 +18,10 @@
   // See https://github.com/Polymer/polymer/issues/1381
   window.addEventListener('WebComponentsReady', function() {
     // Middleware
-    function scrollToTop(ctx, next) {
+    page(function(ctx, next) {
       document.body.scrollTop = 0;
       next();
-    }
+    });
 
     // Routes.
     page('/', function() {
@@ -33,19 +33,19 @@
       app.params = data.params;
     }
 
-    page('/q/:query,:offset', scrollToTop, queryHandler);
-    page('/q/:query', scrollToTop, queryHandler);
+    page('/q/:query,:offset', queryHandler);
+    page('/q/:query', queryHandler);
 
-    page(/^\/(\d+)\/?/, scrollToTop, function(ctx) {
+    page(/^\/(\d+)\/?/, function(ctx) {
       page.redirect('/c/' + ctx.params[0]);
     });
 
-    page('/c/:changeNum', scrollToTop, function(data) {
+    page('/c/:changeNum', function(data) {
       app.route = 'gr-change-view';
       app.params = data.params;
     });
 
-    page(/^\/c\/(\d+)\/((\d+)(\.\.(\d+))?)\/(.+)/, scrollToTop, function(ctx) {
+    page(/^\/c\/(\d+)\/((\d+)(\.\.(\d+))?)\/(.+)/, function(ctx) {
       app.route = 'gr-diff-view';
       var params = {
         changeNum: ctx.params[0],
diff --git a/polygerrit-ui/bower.json b/polygerrit-ui/bower.json
index a50f1cc..e3c3cfc 100644
--- a/polygerrit-ui/bower.json
+++ b/polygerrit-ui/bower.json
@@ -12,18 +12,7 @@
   },
   "devDependencies": {
     "web-component-tester": "*",
-    "iron-test-helpers": "PolymerElements/iron-test-helpers#^1.0",
+    "iron-test-helpers": "PolymerElements/iron-test-helpers#~1.0.6",
     "test-fixture": "PolymerElements/test-fixture#^1.0.0"
-    "polymer": "Polymer/polymer#^1.2.1",
-    "page": "visionmedia/page.js#~1.6.4",
-    "iron-ajax": "PolymerElements/iron-ajax#~1.0.9",
-    "iron-a11y-keys": "PolymerElements/iron-a11y-keys#~1.0.3",
-    "iron-input": "PolymerElements/iron-input#~1.0.6"
-  },
-  "devDependencies": {
-    "web-component-tester": "*",
-    "iron-test-helpers": "PolymerElements/iron-test-helpers#~1.0",
-    "test-fixture": "PolymerElements/test-fixture#^1.0.0",
-    "iron-test-helpers": "PolymerElements/iron-test-helpers#~1.0.6"
   }
 }
diff --git a/polygerrit-ui/server.go b/polygerrit-ui/server.go
index 008fe1d..29b81f4 100644
--- a/polygerrit-ui/server.go
+++ b/polygerrit-ui/server.go
@@ -68,6 +68,7 @@
 		return
 	}
 	defer res.Body.Close()
+	w.WriteHeader(res.StatusCode)
 	if _, err := io.Copy(w, res.Body); err != nil {
 		log.Println("Error copying response to ResponseWriter:", err)
 		return