| /* |
| * 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.cassandra.service.reads.repair; |
| |
| import java.util.Map; |
| |
| import com.codahale.metrics.Meter; |
| import org.apache.cassandra.db.DecoratedKey; |
| import org.apache.cassandra.db.Mutation; |
| import org.apache.cassandra.db.ReadCommand; |
| import org.apache.cassandra.db.partitions.UnfilteredPartitionIterators; |
| import org.apache.cassandra.locator.Endpoints; |
| import org.apache.cassandra.locator.Replica; |
| import org.apache.cassandra.locator.ReplicaPlan; |
| import org.apache.cassandra.metrics.ReadRepairMetrics; |
| |
| /** |
| * Only performs the collection of data responses and reconciliation of them, doesn't send repair mutations |
| * to replicas. This preserves write atomicity, but doesn't provide monotonic quorum reads |
| */ |
| public class ReadOnlyReadRepair<E extends Endpoints<E>, P extends ReplicaPlan.ForRead<E, P>> |
| extends AbstractReadRepair<E, P> |
| { |
| ReadOnlyReadRepair(ReadCommand command, ReplicaPlan.Shared<E, P> replicaPlan, long queryStartNanoTime) |
| { |
| super(command, replicaPlan, queryStartNanoTime); |
| } |
| |
| @Override |
| public UnfilteredPartitionIterators.MergeListener getMergeListener(P replicaPlan) |
| { |
| return UnfilteredPartitionIterators.MergeListener.NOOP; |
| } |
| |
| @Override |
| Meter getRepairMeter() |
| { |
| return ReadRepairMetrics.reconcileRead; |
| } |
| |
| @Override |
| public void maybeSendAdditionalWrites() |
| { |
| |
| } |
| |
| @Override |
| public void repairPartition(DecoratedKey partitionKey, Map<Replica, Mutation> mutations, ReplicaPlan.ForWrite writePlan) |
| { |
| throw new UnsupportedOperationException("ReadOnlyReadRepair shouldn't be trying to repair partitions"); |
| } |
| |
| @Override |
| public void awaitWrites() |
| { |
| |
| } |
| } |