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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.pulsar.metadata.bookkeeper;
import static java.util.concurrent.CompletableFuture.completedFuture;
import static java.util.concurrent.CompletableFuture.failedFuture;
import static org.apache.bookkeeper.util.BookKeeperConstants.AVAILABLE_NODE;
import static org.apache.bookkeeper.util.BookKeeperConstants.COOKIE_NODE;
import static org.apache.bookkeeper.util.BookKeeperConstants.READONLY;
import static org.apache.pulsar.common.util.FutureUtil.Sequencer;
import static org.apache.pulsar.common.util.FutureUtil.waitForAll;
import io.netty.util.concurrent.DefaultThreadFactory;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import lombok.extern.slf4j.Slf4j;
import org.apache.bookkeeper.client.BKException;
import org.apache.bookkeeper.common.concurrent.FutureUtils;
import org.apache.bookkeeper.discover.BookieServiceInfo;
import org.apache.bookkeeper.discover.RegistrationClient;
import org.apache.bookkeeper.net.BookieId;
import org.apache.bookkeeper.versioning.LongVersion;
import org.apache.bookkeeper.versioning.Version;
import org.apache.bookkeeper.versioning.Versioned;
import org.apache.pulsar.common.util.FutureUtil;
import org.apache.pulsar.metadata.api.CacheGetResult;
import org.apache.pulsar.metadata.api.MetadataCache;
import org.apache.pulsar.metadata.api.MetadataStore;
import org.apache.pulsar.metadata.api.Notification;
import org.apache.pulsar.metadata.api.extended.SessionEvent;
import org.apache.pulsar.metadata.impl.AbstractMetadataStore;
@Slf4j
public class PulsarRegistrationClient implements RegistrationClient {
private final AbstractMetadataStore store;
private final String ledgersRootPath;
// registration paths
private final String bookieRegistrationPath;
private final String bookieAllRegistrationPath;
private final String bookieReadonlyRegistrationPath;
private final Set writableBookiesWatchers = new CopyOnWriteArraySet<>();
private final Set readOnlyBookiesWatchers = new CopyOnWriteArraySet<>();
private final MetadataCache bookieServiceInfoMetadataCache;
private final ScheduledExecutorService executor;
private final Map> writableBookieInfo;
private final Map> readOnlyBookieInfo;
private final FutureUtil.Sequencer sequencer;
private SessionEvent lastMetadataSessionEvent;
public PulsarRegistrationClient(MetadataStore store,
String ledgersRootPath) {
this.store = (AbstractMetadataStore) store;
this.ledgersRootPath = ledgersRootPath;
this.bookieServiceInfoMetadataCache = store.getMetadataCache(BookieServiceInfoSerde.INSTANCE);
this.sequencer = Sequencer.create();
this.writableBookieInfo = new ConcurrentHashMap<>();
this.readOnlyBookieInfo = new ConcurrentHashMap<>();
// Following Bookie Network Address Changes is an expensive operation
// as it requires additional ZooKeeper watches
// we can disable this feature, in case the BK cluster has only
// static addresses
this.bookieRegistrationPath = ledgersRootPath + "/" + AVAILABLE_NODE;
this.bookieAllRegistrationPath = ledgersRootPath + "/" + COOKIE_NODE;
this.bookieReadonlyRegistrationPath = this.bookieRegistrationPath + "/" + READONLY;
this.executor = Executors
.newSingleThreadScheduledExecutor(new DefaultThreadFactory("pulsar-registration-client"));
store.registerListener(this::updatedBookies);
this.store.registerSessionListener(this::refreshBookies);
}
@Override
public void close() {
executor.shutdownNow();
}
private void refreshBookies(SessionEvent sessionEvent) {
lastMetadataSessionEvent = sessionEvent;
if (!SessionEvent.Reconnected.equals(sessionEvent) && !SessionEvent.SessionReestablished.equals(sessionEvent)){
return;
}
// Clean caches.
store.invalidateCaches(bookieRegistrationPath, bookieAllRegistrationPath, bookieReadonlyRegistrationPath);
bookieServiceInfoMetadataCache.invalidateAll();
// Refresh caches of the listeners.
getReadOnlyBookies().thenAccept(bookies ->
readOnlyBookiesWatchers.forEach(w -> executor.execute(() -> w.onBookiesChanged(bookies))));
getWritableBookies().thenAccept(bookies ->
writableBookiesWatchers.forEach(w -> executor.execute(() -> w.onBookiesChanged(bookies))));
}
@Override
public CompletableFuture>> getWritableBookies() {
return getBookiesThenFreshCache(bookieRegistrationPath);
}
@Override
public CompletableFuture>> getAllBookies() {
// this method is meant to return all the known bookies, even the bookies
// that are not in a running state
return getBookiesThenFreshCache(bookieAllRegistrationPath);
}
@Override
public CompletableFuture>> getReadOnlyBookies() {
return getBookiesThenFreshCache(bookieReadonlyRegistrationPath);
}
/**
* @throws IllegalArgumentException if parameter path is null or empty.
*/
private CompletableFuture>> getBookiesThenFreshCache(String path) {
if (path == null || path.isEmpty()) {
return failedFuture(
new IllegalArgumentException("parameter [path] can not be null or empty."));
}
return store.getChildren(path)
.thenComposeAsync(children -> {
final Set bookieIds = PulsarRegistrationClient.convertToBookieAddresses(children);
final List> bookieInfoUpdated = new ArrayList<>(bookieIds.size());
for (BookieId id : bookieIds) {
// update the cache for new bookies
if (path.equals(bookieReadonlyRegistrationPath) && readOnlyBookieInfo.get(id) == null) {
bookieInfoUpdated.add(readBookieInfoAsReadonlyBookie(id));
continue;
}
if (path.equals(bookieRegistrationPath) && writableBookieInfo.get(id) == null) {
bookieInfoUpdated.add(readBookieInfoAsWritableBookie(id));
continue;
}
if (path.equals(bookieAllRegistrationPath)) {
if (writableBookieInfo.get(id) != null || readOnlyBookieInfo.get(id) != null) {
// jump to next bookie id
continue;
}
// check writable first
final CompletableFuture revalidateAllBookiesFuture = readBookieInfoAsWritableBookie(id)
.thenCompose(writableBookieInfo -> writableBookieInfo
.>>>map(
bookieServiceInfo -> completedFuture(null))
// check read-only then
.orElseGet(() -> readBookieInfoAsReadonlyBookie(id)));
bookieInfoUpdated.add(revalidateAllBookiesFuture);
}
}
if (bookieInfoUpdated.isEmpty()) {
return completedFuture(bookieIds);
} else {
return waitForAll(bookieInfoUpdated)
.thenApply(___ -> bookieIds);
}
})
.thenApply(s -> new Versioned<>(s, Version.NEW));
}
@Override
public CompletableFuture watchWritableBookies(RegistrationListener registrationListener) {
writableBookiesWatchers.add(registrationListener);
return getWritableBookies()
.thenAcceptAsync(registrationListener::onBookiesChanged, executor);
}
@Override
public void unwatchWritableBookies(RegistrationListener registrationListener) {
writableBookiesWatchers.remove(registrationListener);
}
@Override
public CompletableFuture watchReadOnlyBookies(RegistrationListener registrationListener) {
readOnlyBookiesWatchers.add(registrationListener);
return getReadOnlyBookies()
.thenAcceptAsync(registrationListener::onBookiesChanged, executor);
}
@Override
public void unwatchReadOnlyBookies(RegistrationListener registrationListener) {
readOnlyBookiesWatchers.remove(registrationListener);
}
/**
* This method will receive metadata store notifications and then update the
* local cache in background sequentially.
*/
private void updatedBookies(Notification n) {
// make the notification callback run sequential in background.
final String path = n.getPath();
if (!path.startsWith(bookieReadonlyRegistrationPath) && !path.startsWith(bookieRegistrationPath)) {
// ignore unknown path
return;
}
if (path.equals(bookieReadonlyRegistrationPath) || path.equals(bookieRegistrationPath)) {
// ignore root path
return;
}
final BookieId bookieId = stripBookieIdFromPath(n.getPath());
sequencer.sequential(() -> {
switch (n.getType()) {
case Created:
log.info("Bookie {} created. path: {}", bookieId, n.getPath());
if (path.startsWith(bookieReadonlyRegistrationPath)) {
return getReadOnlyBookies().thenAccept(bookies ->
readOnlyBookiesWatchers.forEach(w ->
executor.execute(() -> w.onBookiesChanged(bookies))));
}
return getWritableBookies().thenAccept(bookies ->
writableBookiesWatchers.forEach(w ->
executor.execute(() -> w.onBookiesChanged(bookies))));
case Modified:
if (bookieId == null) {
return completedFuture(null);
}
log.info("Bookie {} modified. path: {}", bookieId, n.getPath());
if (path.startsWith(bookieReadonlyRegistrationPath)) {
return readBookieInfoAsReadonlyBookie(bookieId).thenApply(__ -> null);
}
return readBookieInfoAsWritableBookie(bookieId).thenApply(__ -> null);
case Deleted:
if (bookieId == null) {
return completedFuture(null);
}
log.info("Bookie {} deleted. path: {}", bookieId, n.getPath());
if (path.startsWith(bookieReadonlyRegistrationPath)) {
readOnlyBookieInfo.remove(bookieId);
return getReadOnlyBookies().thenAccept(bookies -> {
readOnlyBookiesWatchers.forEach(w ->
executor.execute(() -> w.onBookiesChanged(bookies)));
});
}
if (path.startsWith(bookieRegistrationPath)) {
writableBookieInfo.remove(bookieId);
return getWritableBookies().thenAccept(bookies -> {
writableBookiesWatchers.forEach(w ->
executor.execute(() -> w.onBookiesChanged(bookies)));
});
}
return completedFuture(null);
default:
return completedFuture(null);
}
});
}
private static BookieId stripBookieIdFromPath(String path) {
if (path == null) {
return null;
}
final int slash = path.lastIndexOf('/');
if (slash >= 0) {
try {
return BookieId.parse(path.substring(slash + 1));
} catch (IllegalArgumentException e) {
log.warn("Cannot decode bookieId from {}, error: {}", path, e.getMessage());
}
}
return null;
}
private static Set convertToBookieAddresses(List children) {
// Read the bookie addresses into a set for efficient lookup
HashSet newBookieAddrs = new HashSet<>();
for (String bookieAddrString : children) {
if (READONLY.equals(bookieAddrString)) {
continue;
}
BookieId bookieAddr = BookieId.parse(bookieAddrString);
newBookieAddrs.add(bookieAddr);
}
return newBookieAddrs;
}
@Override
public CompletableFuture> getBookieServiceInfo(BookieId bookieId) {
// this method cannot perform blocking calls to the MetadataStore
// or return a CompletableFuture that is completed on the MetadataStore main thread
// this is because there are a few cases in which some operations on the main thread
// wait for the result. This is due to the fact that resolving the address of a bookie
// is needed in many code paths.
Versioned info;
if ((info = writableBookieInfo.get(bookieId)) == null) {
info = readOnlyBookieInfo.get(bookieId);
}
if (log.isDebugEnabled()) {
log.debug("getBookieServiceInfo {} -> {}", bookieId, info);
}
if (info != null) {
return completedFuture(info);
} else {
return FutureUtils.exception(new BKException.BKBookieHandleNotAvailableException());
}
}
public CompletableFuture>> readBookieInfoAsWritableBookie(
BookieId bookieId) {
final String asWritable = bookieRegistrationPath + "/" + bookieId;
return bookieServiceInfoMetadataCache.getWithStats(asWritable)
.thenApply((Optional> bkInfoWithStats) -> {
if (bkInfoWithStats.isPresent()) {
final CacheGetResult r = bkInfoWithStats.get();
log.info("Update BookieInfoCache (writable bookie) {} -> {}", bookieId, r.getValue());
writableBookieInfo.put(bookieId,
new Versioned<>(r.getValue(), new LongVersion(r.getStat().getVersion())));
}
return bkInfoWithStats;
}
);
}
final CompletableFuture>> readBookieInfoAsReadonlyBookie(
BookieId bookieId) {
final String asReadonly = bookieReadonlyRegistrationPath + "/" + bookieId;
return bookieServiceInfoMetadataCache.getWithStats(asReadonly)
.thenApply((Optional> bkInfoWithStats) -> {
if (bkInfoWithStats.isPresent()) {
final CacheGetResult r = bkInfoWithStats.get();
log.info("Update BookieInfoCache (readonly bookie) {} -> {}", bookieId, r.getValue());
readOnlyBookieInfo.put(bookieId,
new Versioned<>(r.getValue(), new LongVersion(r.getStat().getVersion())));
}
return bkInfoWithStats;
});
}
}
