[tests] Prevent test timeouts due to pulsar client hanging while shut…

…down (#1731)

### Motivation

Sometimes tests hang during teardown because the shutdown procedure of
the broker is blocked in waiting for our PulsarClients to close.

### Modifications

Wait for some time.

I have filed this issue upstream in Pulsar in order to have a better
management of this problem
apache/pulsar#19579

kafka-impl/src/main/java/io/streamnative/pulsar/handlers/kop/AbstractPulsarClient.java

@@ -15,12 +15,11 @@
 
 import static org.apache.commons.lang3.StringUtils.isNotBlank;
 
-import java.io.Closeable;
+import java.util.concurrent.CompletableFuture;
 import java.util.function.Consumer;
 import lombok.Getter;
 import lombok.NonNull;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.pulsar.broker.PulsarServerException;
 import org.apache.pulsar.broker.PulsarService;
 import org.apache.pulsar.client.api.AuthenticationFactory;
 import org.apache.pulsar.client.api.PulsarClientException;
@@ -33,15 +32,14 @@
  */
 @Slf4j
 @Getter
-public abstract class AbstractPulsarClient implements Closeable {
+public abstract class AbstractPulsarClient {
 
     private final PulsarClientImpl pulsarClient;
 
     public AbstractPulsarClient(@NonNull final PulsarClientImpl pulsarClient) {
         this.pulsarClient = pulsarClient;
     }
 
-    @Override
     public void close() {
         try {
             pulsarClient.close();
@@ -50,13 +48,8 @@ public void close() {
         }
     }
 
-    protected static PulsarClientImpl createPulsarClient(final PulsarService pulsarService) {
-        try {
-            return (PulsarClientImpl) pulsarService.getClient();
-        } catch (PulsarServerException e) {
-            log.error("Failed to create PulsarClient", e);
-            throw new IllegalStateException(e);
-        }
+    public CompletableFuture<?> closeAsync() {
+        return pulsarClient.closeAsync();
     }
 
     /**

kafka-impl/src/main/java/io/streamnative/pulsar/handlers/kop/KafkaProtocolHandler.java

@@ -38,10 +38,15 @@
 import io.streamnative.pulsar.handlers.kop.utils.delayed.DelayedOperationPurgatory;
 import io.streamnative.pulsar.handlers.kop.utils.timer.SystemTimer;
 import java.net.InetSocketAddress;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
 import lombok.Getter;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.bookkeeper.common.util.OrderedScheduler;
@@ -60,6 +65,7 @@
 import org.apache.pulsar.common.naming.NamespaceName;
 import org.apache.pulsar.common.naming.TopicName;
 import org.apache.pulsar.common.policies.data.ClusterData;
+import org.apache.pulsar.common.util.FutureUtil;
 
 /**
  * Kafka Protocol Handler load and run by Pulsar Service.
@@ -472,17 +478,34 @@ public void close() {
         statsProvider.stop();
         sendResponseScheduler.shutdown();
 
+        List<CompletableFuture<?>> closeHandles = new ArrayList<>();
         if (offsetTopicClient != null) {
-            offsetTopicClient.close();
+            closeHandles.add(offsetTopicClient.closeAsync());
         }
         if (txnTopicClient != null) {
-            txnTopicClient.close();
+            closeHandles.add(txnTopicClient.closeAsync());
+        }
+        if (lookupClient != null) {
+            closeHandles.add(lookupClient.closeAsync());
         }
         if (adminManager != null) {
             adminManager.shutdown();
         }
-        if (lookupClient != null) {
-            lookupClient.close();
+
+        // do not block the broker forever
+        // see https://github.com/apache/pulsar/issues/19579
+        try {
+            FutureUtil
+                    .waitForAll(closeHandles)
+                    .get(Math.max(kafkaConfig.getBrokerShutdownTimeoutMs() / 10, 1000),
+                            TimeUnit.MILLISECONDS);
+        } catch (ExecutionException err) {
+            log.warn("Error while closing some of the internal PulsarClients", err.getCause());
+        } catch (TimeoutException err) {
+            log.warn("Could not stop all the internal PulsarClients within the configured timeout");
+        } catch (InterruptedException err) {
+            Thread.currentThread().interrupt();
+            log.warn("Could not stop all the internal PulsarClients");
         }
     }