org.apache.bookkeeper.replication.BookieLedgerIndexer Maven / Gradle / Ivy
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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.bookkeeper.replication;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CountDownLatch;
import org.apache.bookkeeper.client.BKException;
import org.apache.bookkeeper.meta.LedgerManager;
import org.apache.bookkeeper.net.BookieId;
import org.apache.bookkeeper.proto.BookkeeperInternalCallbacks.Processor;
import org.apache.bookkeeper.replication.ReplicationException.BKAuditException;
import org.apache.zookeeper.AsyncCallback;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Preparing bookie vs its corresponding ledgers. This will always look up the
* ledgermanager for ledger metadata and will generate indexes.
*/
public class BookieLedgerIndexer {
private static final Logger LOG = LoggerFactory.getLogger(BookieLedgerIndexer.class);
private final LedgerManager ledgerManager;
public BookieLedgerIndexer(LedgerManager ledgerManager) {
this.ledgerManager = ledgerManager;
}
/**
* Generating bookie vs its ledgers map by reading all the ledgers in each
* bookie and parsing its metadata.
*
* @return bookie2ledgersMap map of bookie vs ledgers
* @throws BKAuditException
* exception while getting bookie-ledgers
*/
public Map> getBookieToLedgerIndex()
throws BKAuditException {
// bookie vs ledgers map
final ConcurrentHashMap> bookie2ledgersMap = new ConcurrentHashMap>();
final CountDownLatch ledgerCollectorLatch = new CountDownLatch(1);
Processor ledgerProcessor = new Processor() {
@Override
public void process(Long ledgerId, AsyncCallback.VoidCallback iterCallback) {
ledgerManager.readLedgerMetadata(ledgerId).whenComplete((metadata, exception) -> {
if (exception == null) {
for (Map.Entry> ensemble
: metadata.getValue().getAllEnsembles().entrySet()) {
for (BookieId bookie : ensemble.getValue()) {
putLedger(bookie2ledgersMap, bookie.toString(), ledgerId);
}
}
iterCallback.processResult(BKException.Code.OK, null, null);
} else if (BKException.getExceptionCode(exception)
== BKException.Code.NoSuchLedgerExistsOnMetadataServerException) {
LOG.info("Ignoring replication of already deleted ledger {}", ledgerId);
iterCallback.processResult(BKException.Code.OK, null, null);
} else {
LOG.warn("Unable to read the ledger: {} information", ledgerId);
iterCallback.processResult(BKException.getExceptionCode(exception), null, null);
}
});
}
};
// Reading the result after processing all the ledgers
final List resultCode = new ArrayList(1);
ledgerManager.asyncProcessLedgers(ledgerProcessor,
new AsyncCallback.VoidCallback() {
@Override
public void processResult(int rc, String s, Object obj) {
resultCode.add(rc);
ledgerCollectorLatch.countDown();
}
}, null, BKException.Code.OK, BKException.Code.ReadException);
try {
ledgerCollectorLatch.await();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new BKAuditException(
"Exception while getting the bookie-ledgers", e);
}
if (!resultCode.contains(BKException.Code.OK)) {
throw new BKAuditException(
"Exception while getting the bookie-ledgers", BKException
.create(resultCode.get(0)));
}
return bookie2ledgersMap;
}
private void putLedger(ConcurrentHashMap> bookie2ledgersMap,
String bookie, long ledgerId) {
Set ledgers = bookie2ledgersMap.get(bookie);
// creates an empty list and add to bookie for keeping its ledgers
if (ledgers == null) {
ledgers = Collections.synchronizedSet(new HashSet());
Set oldLedgers = bookie2ledgersMap.putIfAbsent(bookie, ledgers);
if (oldLedgers != null) {
ledgers = oldLedgers;
}
}
ledgers.add(ledgerId);
}
}