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HDFS-14383. Compute datanode load based on StoragePolicy. Contributed by Ayush Saxena.

This commit is contained in:
Ayush Saxena 2020-10-19 10:48:47 +05:30
parent 173310e2f5
commit 2e8cafac3b
8 changed files with 180 additions and 3 deletions
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5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
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@ -239,6 +239,11 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
HdfsClientConfigKeys.DeprecatedKeys.DFS_NAMENODE_REDUNDANCY_CONSIDERLOAD_KEY;
public static final boolean DFS_NAMENODE_REDUNDANCY_CONSIDERLOAD_DEFAULT =
true;
public static final String
DFS_NAMENODE_REDUNDANCY_CONSIDERLOADBYSTORAGETYPE_KEY =
"dfs.namenode.redundancy.considerLoadByStorageType";
public static final boolean
DFS_NAMENODE_REDUNDANCY_CONSIDERLOADBYSTORAGETYPE_DEFAULT = false;
public static final String DFS_NAMENODE_READ_CONSIDERLOAD_KEY =
"dfs.namenode.read.considerLoad";
public static final boolean DFS_NAMENODE_READ_CONSIDERLOAD_DEFAULT =

55
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java
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@ -17,6 +17,8 @@
*/
package org.apache.hadoop.hdfs.server.blockmanagement;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_CONSIDERLOADBYSTORAGETYPE_DEFAULT;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_CONSIDERLOADBYSTORAGETYPE_KEY;
import static org.apache.hadoop.util.Time.monotonicNow;
import java.util.*;
@ -92,7 +94,8 @@ public class BlockPlacementPolicyDefault extends BlockPlacementPolicy {
}
}
protected boolean considerLoad;
protected boolean considerLoad;
private boolean considerLoadByStorageType;
protected double considerLoadFactor;
private boolean preferLocalNode;
protected NetworkTopology clusterMap;
@ -116,6 +119,9 @@ public class BlockPlacementPolicyDefault extends BlockPlacementPolicy {
this.considerLoad = conf.getBoolean(
DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_CONSIDERLOAD_KEY,
DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_CONSIDERLOAD_DEFAULT);
this.considerLoadByStorageType = conf.getBoolean(
DFS_NAMENODE_REDUNDANCY_CONSIDERLOADBYSTORAGETYPE_KEY,
DFS_NAMENODE_REDUNDANCY_CONSIDERLOADBYSTORAGETYPE_DEFAULT);
this.considerLoadFactor = conf.getDouble(
DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_CONSIDERLOAD_FACTOR,
DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_CONSIDERLOAD_FACTOR_DEFAULT);
@ -976,8 +982,9 @@ public class BlockPlacementPolicyDefault extends BlockPlacementPolicy {
* @return Return true if the datanode should be excluded, otherwise false
*/
boolean excludeNodeByLoad(DatanodeDescriptor node){
final double maxLoad = considerLoadFactor *
stats.getInServiceXceiverAverage();
double inServiceXceiverCount = getInServiceXceiverAverage(node);
final double maxLoad = considerLoadFactor * inServiceXceiverCount;
final int nodeLoad = node.getXceiverCount();
if ((nodeLoad > maxLoad) && (maxLoad > 0)) {
logNodeIsNotChosen(node, NodeNotChosenReason.NODE_TOO_BUSY,
@ -987,6 +994,48 @@ public class BlockPlacementPolicyDefault extends BlockPlacementPolicy {
return false;
}
/**
* Gets the inServiceXceiver average count for the cluster, if
* considerLoadByStorageType is true, then load is calculated only for the
* storage types present on the datanode.
* @param node the datanode whose storage types are to be taken into account.
* @return the InServiceXceiverAverage count.
*/
private double getInServiceXceiverAverage(DatanodeDescriptor node) {
double inServiceXceiverCount;
if (considerLoadByStorageType) {
inServiceXceiverCount =
getInServiceXceiverAverageByStorageType(node.getStorageTypes());
} else {
inServiceXceiverCount = stats.getInServiceXceiverAverage();
}
return inServiceXceiverCount;
}
/**
* Gets the average xceiver count with respect to the storage types.
* @param storageTypes the storage types.
* @return the average xceiver count wrt the provided storage types.
*/
private double getInServiceXceiverAverageByStorageType(
Set<StorageType> storageTypes) {
double avgLoad = 0;
final Map<StorageType, StorageTypeStats> storageStats =
stats.getStorageTypeStats();
int numNodes = 0;
int numXceiver = 0;
for (StorageType s : storageTypes) {
StorageTypeStats storageTypeStats = storageStats.get(s);
numNodes += storageTypeStats.getNodesInService();
numXceiver += storageTypeStats.getNodesInServiceXceiverCount();
}
if (numNodes != 0) {
avgLoad = (double) numXceiver / numNodes;
}
return avgLoad;
}
/**
* Determine if a datanode is good for placing block.
*

6
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
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@ -24,6 +24,7 @@ import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTest
import org.apache.hadoop.thirdparty.com.google.common.base.Preconditions;
import org.apache.hadoop.thirdparty.com.google.common.net.InetAddresses;
import org.apache.hadoop.fs.StorageType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.HadoopIllegalArgumentException;
@ -1978,6 +1979,11 @@ public class DatanodeManager {
}
return avgLoad;
}
@Override
public Map<StorageType, StorageTypeStats> getStorageTypeStats() {
return heartbeatManager.getStorageTypeStats();
}
};
}

9
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/FSClusterStats.java
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@ -18,6 +18,9 @@
package org.apache.hadoop.hdfs.server.blockmanagement;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.StorageType;
import java.util.Map;
/**
* This interface is used for retrieving the load related statistics of
@ -57,4 +60,10 @@ public interface FSClusterStats {
* writes that are currently occurring on the cluster.
*/
public double getInServiceXceiverAverage();
/**
* Indicates the storage statistics per storage type.
* @return storage statistics per storage type.
*/
Map<StorageType, StorageTypeStats> getStorageTypeStats();
}

16
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/StorageTypeStats.java
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@ -20,6 +20,7 @@ package org.apache.hadoop.hdfs.server.blockmanagement;
import java.beans.ConstructorProperties;
import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.StorageType;
@ -39,6 +40,15 @@ public class StorageTypeStats {
private int nodesInService = 0;
private StorageType storageType;
@VisibleForTesting
void setDataNodesInServiceXceiverCount(int avgXceiverPerDatanode,
int numNodesInService) {
this.nodesInService = numNodesInService;
this.nodesInServiceXceiverCount = numNodesInService * avgXceiverPerDatanode;
}
private int nodesInServiceXceiverCount;
@ConstructorProperties({"capacityTotal", "capacityUsed", "capacityNonDfsUsed",
"capacityRemaining", "blockPoolUsed", "nodesInService"})
public StorageTypeStats(
@ -101,6 +111,10 @@ public class StorageTypeStats {
return nodesInService;
}
public int getNodesInServiceXceiverCount() {
return nodesInServiceXceiverCount;
}
StorageTypeStats(StorageType storageType) {
this.storageType = storageType;
}
@ -131,6 +145,7 @@ public class StorageTypeStats {
void addNode(final DatanodeDescriptor node) {
if (node.isInService()) {
nodesInService++;
nodesInServiceXceiverCount += node.getXceiverCount();
}
}
@ -151,6 +166,7 @@ public class StorageTypeStats {
void subtractNode(final DatanodeDescriptor node) {
if (node.isInService()) {
nodesInService--;
nodesInServiceXceiverCount -= node.getXceiverCount();
}
}
}

11
hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
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@ -313,6 +313,17 @@
</description>
</property>
<property>
<name>dfs.namenode.redundancy.considerLoadByStorageType</name>
<value>false</value>
<description>
Decide if chooseTarget considers the target's load with respect to the
storage type. Typically to be used when datanodes contain homogenous
storage types. Irrelevent if dfs.namenode.redundancy.considerLoad is
false.
</description>
</property>
<property>
<name>dfs.namenode.redundancy.considerLoad.factor</name>
<value>2.0</value>

52
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockStatsMXBean.java
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@ -33,13 +33,18 @@ import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
@ -239,4 +244,51 @@ public class TestBlockStatsMXBean {
storageTypeStats = storageTypeStatsMap.get(StorageType.NVDIMM);
assertEquals(1, storageTypeStats.getNodesInService());
}
@Test
public void testStorageTypeLoad() throws Exception {
HeartbeatManager heartbeatManager =
cluster.getNamesystem().getBlockManager().getDatanodeManager()
.getHeartbeatManager();
Map<StorageType, StorageTypeStats> storageTypeStatsMap =
heartbeatManager.getStorageTypeStats();
DistributedFileSystem dfs = cluster.getFileSystem();
// Create a file with HOT storage policy.
Path hotSpDir = new Path("/HOT");
dfs.mkdir(hotSpDir, FsPermission.getDirDefault());
dfs.setStoragePolicy(hotSpDir, "HOT");
FSDataOutputStream hotSpFileStream =
dfs.create(new Path(hotSpDir, "hotFile"));
hotSpFileStream.write("Storage Policy Hot".getBytes());
hotSpFileStream.hflush();
// Create a file with COLD storage policy.
Path coldSpDir = new Path("/COLD");
dfs.mkdir(coldSpDir, FsPermission.getDirDefault());
dfs.setStoragePolicy(coldSpDir, "COLD");
FSDataOutputStream coldSpFileStream =
dfs.create(new Path(coldSpDir, "coldFile"));
coldSpFileStream.write("Writing to ARCHIVE storage type".getBytes());
coldSpFileStream.hflush();
// Trigger heartbeats manually to speed up the test.
cluster.triggerHeartbeats();
// The load would be 2*replication since both the
// write xceiver & packet responder threads are counted.
GenericTestUtils.waitFor(() -> storageTypeStatsMap.get(StorageType.DISK)
.getNodesInServiceXceiverCount() == 6, 100, 5000);
// The count for ARCHIVE should be independent of the value of DISK.
GenericTestUtils.waitFor(() -> storageTypeStatsMap.get(StorageType.ARCHIVE)
.getNodesInServiceXceiverCount() == 6, 100, 5000);
// The total count should stay unaffected, that is sum of load from all
// datanodes.
GenericTestUtils
.waitFor(() -> heartbeatManager.getInServiceXceiverCount() == 12, 100,
5000);
IOUtils.closeStreams(hotSpFileStream, coldSpFileStream);
}
}

29
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestReplicationPolicy.java
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@ -17,6 +17,7 @@
*/
package org.apache.hadoop.hdfs.server.blockmanagement;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_CONSIDERLOADBYSTORAGETYPE_KEY;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotEquals;
@ -1609,5 +1610,33 @@ public class TestReplicationPolicy extends BaseReplicationPolicyTest {
when(node.getXceiverCount()).thenReturn(10);
assertTrue(bppd.excludeNodeByLoad(node));
// Enable load check per storage type.
conf.setBoolean(DFS_NAMENODE_REDUNDANCY_CONSIDERLOADBYSTORAGETYPE_KEY,
true);
bppd.initialize(conf, statistics, null, null);
Map<StorageType, StorageTypeStats> storageStats = new HashMap<>();
StorageTypeStats diskStorageTypeStats =
new StorageTypeStats(StorageType.DISK);
// Set xceiver count as 500 for DISK.
diskStorageTypeStats.setDataNodesInServiceXceiverCount(50, 10);
storageStats.put(StorageType.DISK, diskStorageTypeStats);
//Set xceiver count as 900 for ARCHIVE
StorageTypeStats archiveStorageTypeStats =
new StorageTypeStats(StorageType.ARCHIVE);
archiveStorageTypeStats.setDataNodesInServiceXceiverCount(10, 90);
storageStats.put(StorageType.ARCHIVE, diskStorageTypeStats);
when(statistics.getStorageTypeStats()).thenReturn(storageStats);
when(node.getXceiverCount()).thenReturn(29);
when(node.getStorageTypes()).thenReturn(EnumSet.of(StorageType.DISK));
when(statistics.getInServiceXceiverAverage()).thenReturn(0.0);
//Added for sanity, the number of datanodes are 100, the average xceiver
// shall be (50*100+90*100)/100 = 14
when(statistics.getInServiceXceiverAverage()).thenReturn(14.0);
when(node.getXceiverCount()).thenReturn(100);
assertFalse(bppd.excludeNodeByLoad(node));
}
}