[fix][client] Fix ReaderBuilder doest not give illegalArgument on connection failure retry

Author: rdhabalia

pulsar-broker/src/test/java/org/apache/pulsar/client/impl/ReaderTest.java

@@ -36,6 +36,8 @@
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
 import lombok.Cleanup;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.pulsar.broker.auth.MockedPulsarServiceBaseTest;
@@ -48,6 +50,7 @@
 import org.apache.pulsar.client.api.MessageRoutingMode;
 import org.apache.pulsar.client.api.Producer;
 import org.apache.pulsar.client.api.ProducerBuilder;
+import org.apache.pulsar.client.api.PulsarClient;
 import org.apache.pulsar.client.api.PulsarClientException;
 import org.apache.pulsar.client.api.Range;
 import org.apache.pulsar.client.api.Reader;
@@ -902,4 +905,28 @@ public void testHasMessageAvailableAfterSeekTimestamp(boolean initializeLastMess
             assertTrue(reader.hasMessageAvailable());
         }
     }
+
+    @Test
+    public void testReaderBuilderStateOnRetryFailure() throws Exception {
+        String ns = "my-property/my-ns";
+        String topic = "persistent://" + ns + "/testRetryReader";
+        RetentionPolicies retention = new RetentionPolicies(-1, -1);
+        admin.namespaces().setRetention(ns, retention);
+        String badUrl = "pulsar://bad-host:8080";
+
+        PulsarClient client = PulsarClient.builder().serviceUrl(badUrl).build();
+
+        ReaderBuilder<byte[]> readerBuilder = client.newReader().topic(topic).startMessageFromRollbackDuration(100,
+                TimeUnit.SECONDS);
+
+        for (int i = 0; i < 3; i++) {
+            try {
+                readerBuilder.createAsync().get(1, TimeUnit.SECONDS);
+            } catch (TimeoutException e) {
+                log.info("It should time out due to invalid url");
+            } catch (IllegalStateException e) {
+                fail("It should not fail with corrupted reader state");
+            }
+        }
+    }
 }

pulsar-client/src/main/java/org/apache/pulsar/client/impl/ReaderBuilderImpl.java

@@ -86,7 +86,8 @@ public CompletableFuture<Reader<T>> createAsync() {
                     .failedFuture(new IllegalArgumentException("Topic name must be set on the reader builder"));
         }
 
-        if (conf.getStartMessageId() != null && conf.getStartMessageFromRollbackDurationInSec() > 0
+        boolean isStartMsgIdExist = conf.getStartMessageId() != null && conf.getStartMessageId() != MessageId.earliest;
+        if (isStartMsgIdExist && conf.getStartMessageFromRollbackDurationInSec() > 0
                 || conf.getStartMessageId() == null && conf.getStartMessageFromRollbackDurationInSec() <= 0) {
             return FutureUtil
                     .failedFuture(new IllegalArgumentException(

pulsar-client/src/test/java/org/apache/pulsar/client/impl/BuildersTest.java

@@ -106,7 +106,7 @@ public void readerBuilderLoadConfTest() throws Exception {
     @Test(expectedExceptions = {PulsarClientException.class}, expectedExceptionsMessageRegExp = ".* must be specified but they cannot be specified at the same time.*")
     public void shouldNotSetTwoOptAtTheSameTime() throws Exception {
         PulsarClient client = PulsarClient.builder().serviceUrl("pulsar://localhost:6650").build();
-        try (Reader reader = client.newReader().topic("abc").startMessageId(MessageId.earliest)
+        try (Reader reader = client.newReader().topic("abc").startMessageId(MessageId.latest)
                 .startMessageFromRollbackDuration(10, TimeUnit.HOURS).create()) {
             // no-op
         } finally {