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Ignore the empty perRegionPlacement when RegionAwareEnsemblePlacementPolicy#newEnsemble #4106

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merged 3 commits into from
Oct 18, 2023
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Ignore the empty perRegionPlacement when RegionAwareEnsemblePlacementPolicy#newEnsemble #4106

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a136a7c
If the `perRegionPlacement` available bookies is empty, not pick book…
horizonzy Oct 16, 2023
f3a4fd5
Fix checkstyle.
horizonzy Oct 16, 2023
fbdfeb6
Address comment.
horizonzy Oct 17, 2023
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7 changes: 4 additions & 3 deletions ...server/src/main/java/org/apache/bookkeeper/client/RegionAwareEnsemblePlacementPolicy.java
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Original file line number Diff line number Diff line change
Expand Up @@ -324,10 +324,11 @@ public PlacementResult<List<BookieId>> newEnsemble(int ensembleSize, int writeQu
excludedBookies);
Set<Node> excludeNodes = convertBookiesToNodes(comprehensiveExclusionBookiesSet);
List<String> availableRegions = new ArrayList<>();
for (String region: perRegionPlacement.keySet()) {
if ((null == disallowBookiePlacementInRegionFeatureName)
for (Map.Entry<String, TopologyAwareEnsemblePlacementPolicy> entry : perRegionPlacement.entrySet()) {
String region = entry.getKey();
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We can filter the empty region in the beginning

if (entry.getValue().knownBookies.isEmpty()) {
                    continue;
                }

if (!entry.getValue().knownBookies.isEmpty() && (null == disallowBookiePlacementInRegionFeatureName
|| !featureProvider.scope(region).getFeature(disallowBookiePlacementInRegionFeatureName)
.isAvailable()) {
.isAvailable())) {
availableRegions.add(region);
}
}
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50 changes: 50 additions & 0 deletions ...er/src/test/java/org/apache/bookkeeper/client/TestRegionAwareEnsemblePlacementPolicy.java
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Original file line number Diff line number Diff line change
Expand Up @@ -27,10 +27,15 @@
import static org.apache.bookkeeper.client.RegionAwareEnsemblePlacementPolicy.REPP_REGIONS_TO_WRITE;
import static org.apache.bookkeeper.client.RoundRobinDistributionSchedule.writeSetFromValues;
import static org.apache.bookkeeper.feature.SettableFeatureProvider.DISABLE_ALL;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;

import com.google.common.collect.Sets;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import io.netty.util.HashedWheelTimer;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.net.InetAddress;
import java.util.ArrayList;
import java.util.HashMap;
Expand Down Expand Up @@ -499,6 +504,51 @@ public void testNewEnsembleBookieWithNotEnoughBookies() throws Exception {
}
}

@Test
public void testNewEnsembleBookieWithOneEmptyRegion() throws Exception {
BookieSocketAddress addr1 = new BookieSocketAddress("127.0.0.2", 3181);
BookieSocketAddress addr2 = new BookieSocketAddress("127.0.0.3", 3181);
BookieSocketAddress addr3 = new BookieSocketAddress("127.0.0.4", 3181);
BookieSocketAddress addr4 = new BookieSocketAddress("127.0.0.5", 3181);
// update dns mapping
StaticDNSResolver.addNodeToRack(addr1.getHostName(), NetworkTopology.DEFAULT_REGION_AND_RACK);
StaticDNSResolver.addNodeToRack(addr2.getHostName(), "/region2/r2");
StaticDNSResolver.addNodeToRack(addr3.getHostName(), "/region3/r3");
StaticDNSResolver.addNodeToRack(addr4.getHostName(), "/region4/r4");
// Update cluster
Set<BookieId> addrs = new HashSet<BookieId>();
addrs.add(addr1.toBookieId());
addrs.add(addr2.toBookieId());
addrs.add(addr3.toBookieId());
addrs.add(addr4.toBookieId());

Field logField = repp.getClass().getDeclaredField("LOG");
Logger mockLogger = mock(Logger.class);

Field modifiers = Field.class.getDeclaredField("modifiers");
modifiers.setAccessible(true);
modifiers.setInt(logField, logField.getModifiers() & ~Modifier.FINAL);
logField.setAccessible(true);
logField.set(null, mockLogger);

repp.onClusterChanged(addrs, new HashSet<BookieId>());
repp.newEnsemble(3, 3, 3, null,
new HashSet<BookieId>()).getResult();
verify(mockLogger, times(0)).warn("Could not allocate {} bookies in region {}, try allocating {} bookies",
1, "UnknownRegion", 0);
addrs = new HashSet<BookieId>();
addrs.add(addr2.toBookieId());
addrs.add(addr3.toBookieId());
addrs.add(addr4.toBookieId());
repp.onClusterChanged(addrs, new HashSet<BookieId>());

repp.newEnsemble(3, 3, 3, null,
new HashSet<BookieId>()).getResult();

verify(mockLogger, times(0)).warn("Could not allocate {} bookies in region {}, try allocating {} bookies",
1, "UnknownRegion", 0);
}

@Test
public void testReplaceBookieWithNotEnoughBookies() throws Exception {
BookieSocketAddress addr1 = new BookieSocketAddress("127.0.0.2", 3181);
Expand Down
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