io.hops.transaction.lock.LastBlockReplicasHashBucketLock.java Source code

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Here is the source code for io.hops.transaction.lock.LastBlockReplicasHashBucketLock.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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 io.hops.transaction.lock;

import io.hops.metadata.hdfs.entity.HashBucket;
import io.hops.metadata.hdfs.entity.Replica;
import io.hops.transaction.EntityManager;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.server.blockmanagement.HashBuckets;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;

import java.io.IOException;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class LastBlockReplicasHashBucketLock extends Lock {

    @Override
    protected void acquire(TransactionLocks locks) throws IOException {
        BlockLock blockLock = (BlockLock) locks.getLock(Type.Block);
        for (INodeFile iNodeFile : blockLock.getFiles()) {
            Block lastBlock = iNodeFile.getLastBlock();
            if (iNodeFile.getLastBlock() != null) {
                List<Replica> replicas = (List<Replica>) EntityManager.findList(Replica.Finder.ByBlockIdAndINodeId,
                        lastBlock.getBlockId(), iNodeFile.getId());
                if (replicas != null) {
                    Collections.sort(replicas, new Comparator<Replica>() {
                        @Override
                        public int compare(Replica o1, Replica o2) {
                            return new Integer(o1.getBucketId()).compareTo(o2.getBucketId());
                        }
                    });

                    //FIXME-BR why lock buckets for all the replicas. Only the last
                    // replica should be locked. Am I missing something
                    for (Replica replica : replicas) {
                        EntityManager.find(HashBucket.Finder.ByStorageIdAndBucketId, replica.getStorageId(),
                                replica.getBucketId());
                    }
                }
            }
        }
    }

    @Override
    protected Type getType() {
        return Type.HashBucket;
    }
}