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HDFS-14979 Allow Balancer to submit getBlocks calls to Observer Nodes when possible. Contributed by Erik Krogen. 

(cherry picked from 586defe711)
This commit is contained in:
Erik Krogen 2019-11-11 14:32:51 -08:00 committed by Erik Krogen
parent 975f669141
commit dec765b329
2 changed files with 23 additions and 0 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/NamenodeProtocol.java
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@ -25,6 +25,7 @@ import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.security.token.block.ExportedBlockKeys;
import org.apache.hadoop.hdfs.server.namenode.CheckpointSignature;
import org.apache.hadoop.hdfs.server.namenode.ha.ReadOnly;
import org.apache.hadoop.io.retry.AtMostOnce;
import org.apache.hadoop.io.retry.Idempotent;
import org.apache.hadoop.security.KerberosInfo;
@ -78,6 +79,7 @@ public interface NamenodeProtocol {
datanode does not exist
*/
@Idempotent
@ReadOnly
BlocksWithLocations getBlocks(DatanodeInfo datanode, long size, long
minBlockSize) throws IOException;

21
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/balancer/TestBalancerWithHANameNodes.java
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@ -18,8 +18,15 @@
package org.apache.hadoop.hdfs.server.balancer;
import static org.junit.Assert.assertEquals;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.anyLong;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
@ -33,6 +40,8 @@ import org.apache.hadoop.hdfs.NameNodeProxies;
import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
import org.apache.hadoop.hdfs.protocol.ClientProtocol;
import org.apache.hadoop.hdfs.qjournal.MiniQJMHACluster;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
import org.apache.hadoop.hdfs.server.namenode.ha.HATestUtil;
import org.apache.hadoop.hdfs.server.namenode.ha.ObserverReadProxyProvider;
import org.junit.Test;
@ -128,12 +137,24 @@ public class TestBalancerWithHANameNodes {
cluster = qjmhaCluster.getDfsCluster();
cluster.waitClusterUp();
cluster.waitActive();
List<FSNamesystem> namesystemSpies = new ArrayList<>();
for (int i = 0; i < cluster.getNumNameNodes(); i++) {
namesystemSpies.add(
NameNodeAdapter.spyOnNamesystem(cluster.getNameNode(i)));
}
DistributedFileSystem dfs = HATestUtil.configureObserverReadFs(
cluster, conf, ObserverReadProxyProvider.class, true);
client = dfs.getClient().getNamenode();
doTest(conf);
for (int i = 0; i < cluster.getNumNameNodes(); i++) {
// First observer node is at idx 2 so it should get both getBlocks calls
// all other NameNodes should see 0 getBlocks calls
int expectedCount = (i == 2) ? 2 : 0;
verify(namesystemSpies.get(i), times(expectedCount))
.getBlocks(any(), anyLong(), anyLong());
}
} finally {
if (qjmhaCluster != null) {
qjmhaCluster.shutdown();