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SystemTopic.java
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SystemTopic.java
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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.broker.service.persistent;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import org.apache.bookkeeper.mledger.ManagedLedger;
import org.apache.pulsar.broker.PulsarServerException;
import org.apache.pulsar.broker.namespace.NamespaceService;
import org.apache.pulsar.broker.service.BrokerService;
import org.apache.pulsar.broker.service.plugin.EntryFilter;
import org.apache.pulsar.common.naming.SystemTopicNames;
import org.apache.pulsar.common.naming.TopicName;
import org.apache.pulsar.common.policies.data.EntryFilters;
public class SystemTopic extends PersistentTopic {
public SystemTopic(String topic, ManagedLedger ledger, BrokerService brokerService) throws PulsarServerException {
super(topic, ledger, brokerService);
}
@Override
public boolean isDeleteWhileInactive() {
return false;
}
@Override
public boolean isSizeBacklogExceeded() {
return false;
}
@Override
public CompletableFuture<Boolean> checkTimeBacklogExceeded() {
return CompletableFuture.completedFuture(false);
}
@Override
public boolean isSystemTopic() {
return true;
}
@Override
public void checkMessageExpiry() {
// do nothing for system topic
}
@Override
public void checkGC() {
// do nothing for system topic
}
@Override
public CompletableFuture<Void> checkReplication() {
if (SystemTopicNames.isTopicPoliciesSystemTopic(topic)) {
return super.checkReplication();
}
return CompletableFuture.completedFuture(null);
}
@Override
public boolean isCompactionEnabled() {
// All system topics are using compaction except `HealthCheck`,
// even though is not explicitly set in the policies.
return !NamespaceService.isHeartbeatNamespace(TopicName.get(topic));
}
@Override
public boolean isDeduplicationEnabled() {
/*
Disable deduplication on system topic to avoid recovering deduplication WAL
(especially from offloaded topic).
Because the system topic usually is a precondition of other topics. therefore,
we should pay attention on topic loading time.
Note: If the system topic loading timeout may cause dependent topics to fail to run.
Dependency diagram: normal topic --rely on--> system topic --rely on--> deduplication recover
--may rely on--> (tiered storage)
*/
return false;
}
@Override
public boolean isEncryptionRequired() {
// System topics are only written by the broker that can't know the encryption context.
return false;
}
@Override
public EntryFilters getEntryFiltersPolicy() {
return null;
}
@Override
public List<EntryFilter> getEntryFilters() {
return null;
}
}