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HDFS-15285. The same distance and load nodes don't shuffle when consider DataNode load. Contributed by Lisheng Sun.

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(cherry picked from commit 9ca6298a9a)
This commit is contained in:
S O'Donnell 2020-04-29 15:36:56 +01:00
parent 8ffe1f313c
commit a34174fea3
3 changed files with 73 additions and 3 deletions
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5
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopology.java
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@ -984,7 +984,10 @@ private <T extends Node> void sortByDistance(Node reader, T[] nodes,
int idx = 0;
for (List<T> list: tree.values()) {
if (list != null) {
secondarySort.accept(list);
Collections.shuffle(list, r);
if (secondarySort != null) {
secondarySort.accept(list);
}
for (T n: list) {
nodes[idx] = n;
idx++;

3
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
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@ -548,8 +548,7 @@ private void sortLocatedBlock(final LocatedBlock lb, String targetHost,
}
private Consumer<List<DatanodeInfo>> createSecondaryNodeSorter() {
Consumer<List<DatanodeInfo>> secondarySort =
list -> Collections.shuffle(list);
Consumer<List<DatanodeInfo>> secondarySort = null;
if (readConsiderLoad) {
Comparator<DatanodeInfo> comp =
Comparator.comparingInt(DatanodeInfo::getXceiverCount);

68
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestDatanodeManager.java
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@ -28,11 +28,13 @@
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Random;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ -600,6 +602,72 @@ public void testGetBlockLocationConsiderLoad()
assertEquals(locs[0].getIpAddr(), sortedLocs2[4].getIpAddr());
}
@Test
public void testGetBlockLocationConsiderLoadWithNodesOfSameDistance()
throws IOException, URISyntaxException {
Configuration conf = new Configuration();
conf.setBoolean(DFSConfigKeys.DFS_NAMENODE_READ_CONSIDERLOAD_KEY, true);
conf.setBoolean(
DFSConfigKeys.DFS_NAMENODE_AVOID_STALE_DATANODE_FOR_READ_KEY, true);
FSNamesystem fsn = Mockito.mock(FSNamesystem.class);
Mockito.when(fsn.hasWriteLock()).thenReturn(true);
URL shellScript = getClass()
.getResource("/" + Shell.appendScriptExtension("topology-script"));
Path resourcePath = Paths.get(shellScript.toURI());
FileUtil.setExecutable(resourcePath.toFile(), true);
conf.set(DFSConfigKeys.NET_TOPOLOGY_SCRIPT_FILE_NAME_KEY,
resourcePath.toString());
DatanodeManager dm = mockDatanodeManager(fsn, conf);
int totalDNs = 5;
// Register 5 datanodes and 2 nodes per rack with different load.
DatanodeInfo[] locs = new DatanodeInfo[totalDNs];
String[] storageIDs = new String[totalDNs];
for (int i = 0; i < totalDNs; i++) {
// Register new datanode.
String uuid = "UUID-" + i;
String ip = "IP-" + i / 2 + "-" + i;
DatanodeRegistration dr = Mockito.mock(DatanodeRegistration.class);
Mockito.when(dr.getDatanodeUuid()).thenReturn(uuid);
Mockito.when(dr.getIpAddr()).thenReturn(ip);
dm.registerDatanode(dr);
// Get location and storage information.
locs[i] = dm.getDatanode(uuid);
storageIDs[i] = "storageID-" + i;
// Set load for datanodes.
locs[i].setXceiverCount(2);
}
// Set node 0 decommissioned.
locs[0].setDecommissioned();
// Create LocatedBlock with above locations.
ExtendedBlock b = new ExtendedBlock("somePoolID", 1234);
LocatedBlock block = new LocatedBlock(b, locs);
List<LocatedBlock> blocks = new ArrayList<>();
blocks.add(block);
// Test client not in cluster but same rack with locs[3].
// Number of iterations to do the test
int numIterations = 100;
Set<String> ipSet = new HashSet<>();
final String targetIpNotInCluster = locs[3].getIpAddr() + "-client";
for (int i = 0; i < numIterations; i++) {
dm.sortLocatedBlocks(targetIpNotInCluster, blocks);
DatanodeInfo[] sortedLocs = block.getLocations();
assertEquals(totalDNs, sortedLocs.length);
if (!ipSet.contains(sortedLocs[0].getIpAddr())) {
ipSet.add(sortedLocs[0].getIpAddr());
}
}
// when the two nodes' distance and weight are same, they are same close.
assertEquals(2, ipSet.size());
}
/**
* Test whether removing a host from the includes list without adding it to
* the excludes list will exclude it from data node reports.