1 files changed, 108 insertions, 0 deletions
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/notedb/rebuild/OnlineNoteDbMigrator.java b/gerrit-server/src/main/java/com/google/gerrit/server/notedb/rebuild/OnlineNoteDbMigrator.java
new file mode 100644
index 0000000000..65755ed14f
--- /dev/null
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/notedb/rebuild/OnlineNoteDbMigrator.java
@@ -0,0 +1,108 @@
+// Copyright (C) 2017 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.notedb.rebuild;
+
+import com.google.common.base.Stopwatch;
+import com.google.gerrit.extensions.events.LifecycleListener;
+import com.google.gerrit.lifecycle.LifecycleModule;
+import com.google.gerrit.server.config.GerritServerConfig;
+import com.google.gerrit.server.index.OnlineUpgrader;
+import com.google.gerrit.server.index.VersionManager;
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import com.google.inject.Singleton;
+import com.google.inject.name.Named;
+import com.google.inject.name.Names;
+import java.util.concurrent.TimeUnit;
+import org.eclipse.jgit.lib.Config;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+@Singleton
+public class OnlineNoteDbMigrator implements LifecycleListener {
+  private static final Logger log = LoggerFactory.getLogger(OnlineNoteDbMigrator.class);
+
+  private static final String TRIAL = "OnlineNoteDbMigrator/trial";
+
+  public static class Module extends LifecycleModule {
+    private final boolean trial;
+
+    public Module(boolean trial) {
+      this.trial = trial;
+    }
+
+    @Override
+    public void configure() {
+      listener().to(OnlineNoteDbMigrator.class);
+      bindConstant().annotatedWith(Names.named(TRIAL)).to(trial);
+    }
+  }
+
+  private final GcAllUsers gcAllUsers;
+  private final OnlineUpgrader indexUpgrader;
+  private final Provider<NoteDbMigrator.Builder> migratorBuilderProvider;
+  private final boolean upgradeIndex;
+  private final boolean trial;
+
+  @Inject
+  OnlineNoteDbMigrator(
+      @GerritServerConfig Config cfg,
+      GcAllUsers gcAllUsers,
+      OnlineUpgrader indexUpgrader,
+      Provider<NoteDbMigrator.Builder> migratorBuilderProvider,
+      @Named(TRIAL) boolean trial) {
+    this.gcAllUsers = gcAllUsers;
+    this.indexUpgrader = indexUpgrader;
+    this.migratorBuilderProvider = migratorBuilderProvider;
+    this.upgradeIndex = VersionManager.getOnlineUpgrade(cfg);
+    this.trial = trial || NoteDbMigrator.getTrialMode(cfg);
+  }
+
+  @Override
+  public void start() {
+    Thread t = new Thread(this::migrate);
+    t.setDaemon(true);
+    t.setName(getClass().getSimpleName());
+    t.start();
+  }
+
+  private void migrate() {
+    log.info("Starting online NoteDb migration");
+    if (upgradeIndex) {
+      log.info("Online index schema upgrades will be deferred until NoteDb migration is complete");
+    }
+    Stopwatch sw = Stopwatch.createStarted();
+    // TODO(dborowitz): Tune threads, maybe expose a progress monitor somewhere.
+    try (NoteDbMigrator migrator =
+        migratorBuilderProvider.get().setAutoMigrate(true).setTrialMode(trial).build()) {
+      migrator.migrate();
+    } catch (Exception e) {
+      log.error("Error in online NoteDb migration", e);
+    }
+    gcAllUsers.runWithLogger();
+    log.info("Online NoteDb migration completed in {}s", sw.elapsed(TimeUnit.SECONDS));
+
+    if (upgradeIndex) {
+      log.info("Starting deferred index schema upgrades");
+      indexUpgrader.start();
+    }
+  }
+
+  @Override
+  public void stop() {
+    // Do nothing; upgrade process uses daemon threads and knows how to recover from failures on
+    // next attempt.
+  }
+}