| /* |
| * 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 java.util.Queue; |
| import java.util.concurrent.ConcurrentLinkedQueue; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.cassandra.db.DecoratedKey; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.codahale.metrics.Meter; |
| import org.apache.cassandra.config.DatabaseDescriptor; |
| import org.apache.cassandra.db.Mutation; |
| import org.apache.cassandra.db.ReadCommand; |
| import org.apache.cassandra.db.partitions.UnfilteredPartitionIterators; |
| import org.apache.cassandra.exceptions.ReadTimeoutException; |
| import org.apache.cassandra.locator.Endpoints; |
| import org.apache.cassandra.locator.Replica; |
| import org.apache.cassandra.locator.ReplicaPlan; |
| import org.apache.cassandra.metrics.ReadRepairMetrics; |
| import org.apache.cassandra.tracing.Tracing; |
| |
| import static java.util.concurrent.TimeUnit.NANOSECONDS; |
| |
| /** |
| * 'Classic' read repair. Doesn't allow the client read to return until |
| * updates have been written to nodes needing correction. Breaks write |
| * atomicity in some situations |
| */ |
| public class BlockingReadRepair<E extends Endpoints<E>, P extends ReplicaPlan.ForRead<E>> |
| extends AbstractReadRepair<E, P> |
| { |
| private static final Logger logger = LoggerFactory.getLogger(BlockingReadRepair.class); |
| |
| protected final Queue<BlockingPartitionRepair> repairs = new ConcurrentLinkedQueue<>(); |
| |
| BlockingReadRepair(ReadCommand command, ReplicaPlan.Shared<E, P> replicaPlan, long queryStartNanoTime) |
| { |
| super(command, replicaPlan, queryStartNanoTime); |
| } |
| |
| public UnfilteredPartitionIterators.MergeListener getMergeListener(P replicaPlan) |
| { |
| return new PartitionIteratorMergeListener<>(replicaPlan, command, this); |
| } |
| |
| @Override |
| Meter getRepairMeter() |
| { |
| return ReadRepairMetrics.repairedBlocking; |
| } |
| |
| @Override |
| public void maybeSendAdditionalWrites() |
| { |
| for (BlockingPartitionRepair repair: repairs) |
| { |
| repair.maybeSendAdditionalWrites(cfs.additionalWriteLatencyNanos, TimeUnit.NANOSECONDS); |
| } |
| } |
| |
| @Override |
| public void awaitWrites() |
| { |
| BlockingPartitionRepair timedOut = null; |
| for (BlockingPartitionRepair repair : repairs) |
| { |
| if (!repair.awaitRepairsUntil(DatabaseDescriptor.getReadRpcTimeout(NANOSECONDS) + queryStartNanoTime, NANOSECONDS)) |
| { |
| timedOut = repair; |
| break; |
| } |
| } |
| if (timedOut != null) |
| { |
| // We got all responses, but timed out while repairing; |
| // pick one of the repairs to throw, as this is better than completely manufacturing the error message |
| int blockFor = timedOut.blockFor(); |
| int received = Math.min(blockFor - timedOut.waitingOn(), blockFor - 1); |
| if (Tracing.isTracing()) |
| Tracing.trace("Timed out while read-repairing after receiving all {} data and digest responses", blockFor); |
| else |
| logger.debug("Timeout while read-repairing after receiving all {} data and digest responses", blockFor); |
| |
| throw new ReadTimeoutException(replicaPlan().consistencyLevel(), received, blockFor, true); |
| } |
| } |
| |
| @Override |
| public void repairPartition(DecoratedKey partitionKey, Map<Replica, Mutation> mutations, ReplicaPlan.ForTokenWrite writePlan) |
| { |
| BlockingPartitionRepair blockingRepair = new BlockingPartitionRepair(partitionKey, mutations, writePlan); |
| blockingRepair.sendInitialRepairs(); |
| repairs.add(blockingRepair); |
| } |
| } |