/**
* 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 static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
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.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.junit.Test;
import java.util.Iterator;
public class TestUnderReplicatedBlocks {
@Test(timeout=60000) // 1 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);
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();
ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, FILE_PATH);
DatanodeDescriptor dn = bm.blocksMap.getStorages(b.getLocalBlock())
.iterator().next().getDatanodeDescriptor();
bm.addToInvalidates(b.getLocalBlock(), dn);
Thread.sleep(5000);
bm.blocksMap.removeNode(b.getLocalBlock(), dn);
// 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();
}
}
/**
* The test verifies the number of outstanding replication requests for a
* given DN shouldn't exceed the limit set by configuration property
* dfs.namenode.replication.max-streams-hard-limit.
* The test does the followings:
* 1. Create a mini cluster with 2 DNs. Set large heartbeat interval so that
* replication requests won't be picked by any DN right away.
* 2. Create a file with 10 blocks and replication factor 2. Thus each
* of the 2 DNs have one replica of each block.
* 3. Add a DN to the cluster for later replication.
* 4. Remove a DN that has data.
* 5. Ask BlockManager to compute the replication work. This will assign
* replication requests to the only DN that has data.
* 6. Make sure the number of pending replication requests of that DN don't
* exceed the limit.
* @throws Exception
*/
@Test(timeout=60000) // 1 min timeout
public void testNumberOfBlocksToBeReplicated() throws Exception {
Configuration conf = new HdfsConfiguration();
conf.setLong(DFSConfigKeys.DFS_NAMENODE_MIN_BLOCK_SIZE_KEY, 0);
conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 1);
conf.setInt(DFSConfigKeys.DFS_BYTES_PER_CHECKSUM_KEY, 1);
// Large value to make sure the pending replication request can stay in
// DatanodeDescriptor.replicateBlocks before test timeout.
conf.setInt(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, 100);
// Make sure BlockManager can pull all blocks from UnderReplicatedBlocks via
// chooseUnderReplicatedBlocks at once.
conf.setInt(
DFSConfigKeys.DFS_NAMENODE_REPLICATION_WORK_MULTIPLIER_PER_ITERATION, 5);
int NUM_OF_BLOCKS = 10;
final short REP_FACTOR = 2;
final String FILE_NAME = "/testFile";
final Path FILE_PATH = new Path(FILE_NAME);
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(
REP_FACTOR).build();
try {
// create a file with 10 blocks with a replication factor of 2
final FileSystem fs = cluster.getFileSystem();
DFSTestUtil.createFile(fs, FILE_PATH, NUM_OF_BLOCKS, REP_FACTOR, 1L);
DFSTestUtil.waitReplication(fs, FILE_PATH, REP_FACTOR);
cluster.startDataNodes(conf, 1, true, null, null, null, null);
final BlockManager bm = cluster.getNamesystem().getBlockManager();
ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, FILE_PATH);
Iterator<DatanodeStorageInfo> storageInfos =
bm.blocksMap.getStorages(b.getLocalBlock())
.iterator();
DatanodeDescriptor firstDn = storageInfos.next().getDatanodeDescriptor();
DatanodeDescriptor secondDn = storageInfos.next().getDatanodeDescriptor();
bm.getDatanodeManager().removeDatanode(firstDn);
assertEquals(NUM_OF_BLOCKS, bm.getUnderReplicatedNotMissingBlocks());
bm.computeDatanodeWork();
assertTrue("The number of blocks to be replicated should be less than "
+ "or equal to " + bm.replicationStreamsHardLimit,
secondDn.getNumberOfBlocksToBeReplicated()
<= bm.replicationStreamsHardLimit);
} finally {
cluster.shutdown();
}
}
}