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// 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.index;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.gerrit.extensions.events.LifecycleListener;
import com.google.gerrit.index.Index;
import com.google.gerrit.index.IndexCollection;
import com.google.gerrit.index.IndexDefinition;
import com.google.gerrit.index.IndexDefinition.IndexFactory;
import com.google.gerrit.index.Schema;
import com.google.gerrit.server.config.SitePaths;
import com.google.gerrit.server.plugincontext.PluginSetContext;
import com.google.inject.ProvisionException;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.lib.Config;
/** Trigger for online reindexing in case the index version in use is not the latest. */
public abstract class VersionManager implements LifecycleListener {
public static boolean getOnlineUpgrade(Config cfg) {
return cfg.getBoolean("index", null, "onlineUpgrade", true);
}
public static class Version {
public final Schema schema;
public final int version;
public final boolean exists;
public final boolean ready;
public Version(Schema schema, int version, boolean exists, boolean ready) {
checkArgument(schema == null || schema.getVersion() == version);
this.schema = schema;
this.version = version;
this.exists = exists;
this.ready = ready;
}
}
protected final boolean onlineUpgrade;
protected final String runReindexMsg;
protected final SitePaths sitePaths;
private final PluginSetContext listeners;
// The following fields must be accessed synchronized on this.
protected final Map> defs;
protected final Map> reindexers;
protected VersionManager(
SitePaths sitePaths,
PluginSetContext listeners,
Collection> defs,
boolean onlineUpgrade) {
this.sitePaths = sitePaths;
this.listeners = listeners;
this.defs = Maps.newHashMapWithExpectedSize(defs.size());
for (IndexDefinition def : defs) {
this.defs.put(def.getName(), def);
}
this.reindexers = Maps.newHashMapWithExpectedSize(defs.size());
this.onlineUpgrade = onlineUpgrade;
this.runReindexMsg =
"No index versions for index '%s' ready; run java -jar "
+ sitePaths.gerrit_war.toAbsolutePath()
+ " reindex --index %s";
}
@Override
public void start() {
GerritIndexStatus cfg = createIndexStatus();
for (IndexDefinition def : defs.values()) {
initIndex(def, cfg);
}
}
@Override
public void stop() {
// Do nothing; indexes are closed on demand by IndexCollection.
}
/**
* Start the online reindexer if the current index is not already the latest.
*
* @param name index name
* @param force start re-index
* @return true if started, otherwise false.
*/
public synchronized boolean startReindexer(String name, boolean force)
throws ReindexerAlreadyRunningException {
OnlineReindexer reindexer = reindexers.get(name);
validateReindexerNotRunning(reindexer);
if (force || !isLatestIndexVersion(name, reindexer)) {
reindexer.start();
return true;
}
return false;
}
/**
* Activate the latest index if the current index is not already the latest.
*
* @param name index name
* @return true if index was activated, otherwise false.
*/
public synchronized boolean activateLatestIndex(String name)
throws ReindexerAlreadyRunningException {
OnlineReindexer reindexer = reindexers.get(name);
validateReindexerNotRunning(reindexer);
if (!isLatestIndexVersion(name, reindexer)) {
reindexer.activateIndex();
return true;
}
return false;
}
/**
* Tells if an index with this name is currently known or not.
*
* @param name index name
* @return true if index is known and can be used, otherwise false.
*/
public boolean isKnownIndex(String name) {
return defs.get(name) != null;
}
protected > void initIndex(
IndexDefinition def, GerritIndexStatus cfg) {
TreeMap> versions = scanVersions(def, cfg);
// Search from the most recent ready version.
// Write to the most recent ready version and the most recent version.
Version search = null;
List> write = Lists.newArrayListWithCapacity(2);
for (Version v : versions.descendingMap().values()) {
if (v.schema == null) {
continue;
}
if (write.isEmpty() && onlineUpgrade) {
write.add(v);
}
if (v.ready) {
search = v;
if (!write.contains(v)) {
write.add(v);
}
break;
}
}
if (search == null) {
throw new ProvisionException(String.format(runReindexMsg, def.getName(), def.getName()));
}
IndexFactory factory = def.getIndexFactory();
I searchIndex = factory.create(search.schema);
IndexCollection indexes = def.getIndexCollection();
indexes.setSearchIndex(searchIndex);
for (Version v : write) {
if (v.version != search.version) {
indexes.addWriteIndex(factory.create(v.schema));
} else {
indexes.addWriteIndex(searchIndex);
}
}
markNotReady(def.getName(), versions.values(), write);
synchronized (this) {
if (!reindexers.containsKey(def.getName())) {
int latest = write.get(0).version;
OnlineReindexer reindexer =
new OnlineReindexer<>(def, search.version, latest, listeners);
reindexers.put(def.getName(), reindexer);
}
}
}
synchronized void startOnlineUpgrade() {
checkState(onlineUpgrade, "online upgrade not enabled");
for (IndexDefinition def : defs.values()) {
String name = def.getName();
IndexCollection indexes = def.getIndexCollection();
Index search = indexes.getSearchIndex();
checkState(
search != null, "no search index ready for %s; should have failed at startup", name);
int searchVersion = search.getSchema().getVersion();
List> write = ImmutableList.copyOf(indexes.getWriteIndexes());
checkState(
!write.isEmpty(),
"no write indexes set for %s; should have been initialized at startup",
name);
int latestWriteVersion = write.get(0).getSchema().getVersion();
if (latestWriteVersion != searchVersion) {
OnlineReindexer reindexer = reindexers.get(name);
checkState(
reindexer != null,
"no reindexer found for %s; should have been initialized at startup",
name);
reindexer.start();
}
}
}
protected GerritIndexStatus createIndexStatus() {
try {
return new GerritIndexStatus(sitePaths);
} catch (ConfigInvalidException | IOException e) {
throw fail(e);
}
}
protected abstract > TreeMap> scanVersions(
IndexDefinition def, GerritIndexStatus cfg);
private boolean isDirty(Collection> inUse, Version v) {
return !inUse.contains(v) && v.exists;
}
private boolean isLatestIndexVersion(String name, OnlineReindexer reindexer) {
int readVersion = defs.get(name).getIndexCollection().getSearchIndex().getSchema().getVersion();
return reindexer == null || reindexer.getVersion() == readVersion;
}
private static void validateReindexerNotRunning(OnlineReindexer reindexer)
throws ReindexerAlreadyRunningException {
if (reindexer != null && reindexer.isRunning()) {
throw new ReindexerAlreadyRunningException();
}
}
private void markNotReady(
String name, Iterable> versions, Collection> inUse) {
GerritIndexStatus cfg = createIndexStatus();
boolean dirty = false;
for (Version v : versions) {
if (isDirty(inUse, v)) {
cfg.setReady(name, v.version, false);
dirty = true;
}
}
if (dirty) {
try {
cfg.save();
} catch (IOException e) {
throw fail(e);
}
}
}
private ProvisionException fail(Throwable t) {
return new ProvisionException("Error scanning indexes", t);
}
}
