/**
 * 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.hadoop.hdfs.server.blockmanagement;

import io.hops.common.INodeUtil;
import io.hops.exception.StorageException;
import io.hops.metadata.hdfs.entity.INodeIdentifier;
import io.hops.transaction.handler.HDFSOperationType;
import io.hops.transaction.handler.HopsTransactionalRequestHandler;
import io.hops.transaction.lock.LockFactory;
import io.hops.transaction.lock.TransactionLockTypes.INodeLockType;
import io.hops.transaction.lock.TransactionLocks;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FsShell;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
import org.junit.Test;

import java.io.IOException;

import static org.junit.Assert.assertEquals;

public class TestUnderReplicatedBlocks {
  @Test(timeout = 300000) // 5 min timeout
  public void testSetrepIncWithUnderReplicatedBlocks() throws Exception {
    Configuration conf = new HdfsConfiguration();
    final short REPLICATION_FACTOR = 2;
    final String FILE_NAME = "/testFile";
    final Path FILE_PATH = new Path(FILE_NAME);
    final MiniDFSCluster cluster =
        new MiniDFSCluster.Builder(conf).numDataNodes(REPLICATION_FACTOR + 1)
            .build();
    try {
      // create a file with one block with a replication factor of 2
      final FileSystem fs = cluster.getFileSystem();
      DFSTestUtil.createFile(fs, FILE_PATH, 1L, REPLICATION_FACTOR, 1L);
      DFSTestUtil.waitReplication(fs, FILE_PATH, REPLICATION_FACTOR);
      
      // remove one replica from the blocksMap so block becomes under-replicated
      // but the block does not get put into the under-replicated blocks queue
      final BlockManager bm = cluster.getNamesystem().getBlockManager();
      final ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, FILE_PATH);

      HopsTransactionalRequestHandler handler =
          new HopsTransactionalRequestHandler(HDFSOperationType.TEST) {
            INodeIdentifier inodeIdentifier;

            @Override
            public void setUp() throws StorageException {
              Block blk = b.getLocalBlock();
              inodeIdentifier = INodeUtil.resolveINodeFromBlock(blk);
            }

            @Override
            public void acquireLock(TransactionLocks locks) throws IOException {
              LockFactory lf = LockFactory.getInstance();
              locks.add(lf.getIndividualINodeLock(INodeLockType.WRITE,
                  inodeIdentifier)).add(
                  lf.getIndividualBlockLock(b.getBlockId(), inodeIdentifier))
                  .add(lf.getBlockRelated(LockFactory.BLK.RE,
                      LockFactory.BLK.IV));
            }

            @Override
            public Object performTask() throws StorageException, IOException {
              DatanodeDescriptor dn =
                  bm.blocksMap.nodeIterator(b.getLocalBlock()).next();
              bm.addToInvalidates(b.getLocalBlock(), dn);

              bm.blocksMap.removeNode(b.getLocalBlock(), dn);
              return dn;
            }
          };
      DatanodeDescriptor dn = (DatanodeDescriptor) handler.handle();
      
      //PATCH https://issues.apache.org/jira/browse/HDFS-4067
      // Compute the invalidate work in NN, and trigger the heartbeat from DN
      BlockManagerTestUtil.computeAllPendingWork(bm);
      DataNodeTestUtils.triggerHeartbeat(cluster.getDataNode(dn.getIpcPort()));
      // Wait to make sure the DataNode receives the deletion request 
      Thread.sleep(1000);
      

      HopsTransactionalRequestHandler handler2 =
          new HopsTransactionalRequestHandler(HDFSOperationType.TEST) {
            INodeIdentifier inodeIdentifier;

            @Override
            public void setUp() throws StorageException {
              Block blk = b.getLocalBlock();
              inodeIdentifier = INodeUtil.resolveINodeFromBlock(blk);
            }

            @Override
            public void acquireLock(TransactionLocks locks) throws IOException {
              LockFactory lf = LockFactory.getInstance();
              locks.add(lf.getIndividualINodeLock(INodeLockType.WRITE,
                  inodeIdentifier)).add(
                  lf.getIndividualBlockLock(b.getBlockId(), inodeIdentifier))
                  .add(lf.getBlockRelated(LockFactory.BLK.RE,
                      LockFactory.BLK.IV));
            }

            @Override
            public Object performTask() throws StorageException, IOException {
              DatanodeDescriptor dn = (DatanodeDescriptor) getParams()[0];
              // Remove the record from blocksMap
              bm.blocksMap.removeNode(b.getLocalBlock(), dn);
              return null;
            }
          };
      handler2.setParams(dn);
      handler2.handle();
      
      // increment this file's replication factor
      FsShell shell = new FsShell(conf);
      assertEquals(0, shell.run(new String[]{"-setrep", "-w",
          Integer.toString(1 + REPLICATION_FACTOR), FILE_NAME}));
    } finally {
      cluster.shutdown();
    }
    
  }

}