content: /*
   * 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 org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.db.ConsistencyLevel;
  import org.apache.cassandra.db.DecoratedKey;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.db.Mutation;
  import org.apache.cassandra.db.MutationExceededMaxSizeException;
  import org.apache.cassandra.db.ReadCommand.PotentialTxnConflicts;
  import org.apache.cassandra.db.partitions.PartitionUpdate;
  import org.apache.cassandra.exceptions.ReadTimeoutException;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.net.MessagingService;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.tracing.Tracing;
  
  import static org.apache.cassandra.config.CassandraRelevantProperties.DROP_OVERSIZED_READ_REPAIR_MUTATIONS;
  import static org.apache.cassandra.db.IMutation.MAX_MUTATION_SIZE;
  
  public class BlockingReadRepairs
  {
      private static final Logger logger = LoggerFactory.getLogger(BlockingReadRepairs.class);
  
      private static final boolean SHOULD_DROP_OVERSIZED_READ_REPAIR_MUTATIONS = DROP_OVERSIZED_READ_REPAIR_MUTATIONS.getBoolean();
  
      /**
       * Create a read repair mutation from the given update, if the mutation is not larger than the maximum
       * mutation size, otherwise return null. Or, if we're configured to be strict, throw an exception.
       */
      public static Mutation createRepairMutation(PartitionUpdate update, ConsistencyLevel consistency, InetAddressAndPort destination, boolean suppressException, PotentialTxnConflicts potentialTxnConflicts)
      {
          if (update == null)
              return null;
  
          DecoratedKey key = update.partitionKey();
          Mutation mutation = new Mutation(update, potentialTxnConflicts);
          int messagingVersion = MessagingService.instance().versions.get(destination);
  
          try
          {
              mutation.validateSize(messagingVersion, 0);
              return mutation;
          }
          catch (MutationExceededMaxSizeException e)
          {
              Keyspace keyspace = Keyspace.open(mutation.getKeyspaceName());
              TableMetadata metadata = update.metadata();
  
              if (SHOULD_DROP_OVERSIZED_READ_REPAIR_MUTATIONS)
              {
                  logger.debug("Encountered an oversized ({}/{}) read repair mutation for table {}, key {}, node {}",
                               e.mutationSize,
                               MAX_MUTATION_SIZE,
                               metadata,
                               metadata.partitionKeyType.getString(key.getKey()),
                               destination);
              }
              else
              {
                  logger.warn("Encountered an oversized ({}/{}) read repair mutation for table {}, key {}, node {}",
                              e.mutationSize,
                              MAX_MUTATION_SIZE,
                              metadata,
                              metadata.partitionKeyType.getString(key.getKey()),
                              destination);
  
                  if (!suppressException)
                  {
                      int blockFor = consistency.blockFor(keyspace.getReplicationStrategy());
                      Tracing.trace("Timed out while read-repairing after receiving all {} data and digest responses", blockFor);
                      throw new ReadTimeoutException(consistency, blockFor - 1, blockFor, true);
                  }
              }
              return null;
          }
      }
  }
  