[Java] Fix issue where multiple archive clients are trying to connect.

aeron-archive/src/main/java/io/aeron/archive/client/ControlResponsePoller.java

@@ -28,7 +28,7 @@
  */
 public class ControlResponsePoller implements ControlledFragmentHandler
 {
-    private static final int FRAGMENT_LIMIT = 10;
+    private static final int FRAGMENT_LIMIT = 1;
 
     private final MessageHeaderDecoder messageHeaderDecoder = new MessageHeaderDecoder();
     private final ControlResponseDecoder controlResponseDecoder = new ControlResponseDecoder();

aeron-archive/src/test/java/io/aeron/archive/ArchiveTest.java

@@ -15,8 +15,15 @@
  */
 package io.aeron.archive;
 
+import io.aeron.archive.client.AeronArchive;
+import io.aeron.driver.MediaDriver;
 import org.junit.Test;
 
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
 import static org.hamcrest.core.Is.is;
 import static org.junit.Assert.assertThat;
 
@@ -33,4 +40,36 @@ public void shouldGenerateRecordingName()
 
         assertThat(actual, is(expected));
     }
+
+    @Test
+    public void shouldAllowMultipleConnectionsInParallel() throws InterruptedException
+    {
+        final int numberOfArchiveClients = 5;
+        final CountDownLatch latch = new CountDownLatch(numberOfArchiveClients);
+        final ExecutorService executorService = Executors.newFixedThreadPool(numberOfArchiveClients);
+
+        final MediaDriver.Context driverCtx = new MediaDriver.Context();
+        final Archive.Context archiveCtx = new Archive.Context();
+
+        try (ArchivingMediaDriver driver = ArchivingMediaDriver.launch(driverCtx, archiveCtx))
+        {
+            for (int i = 0; i < numberOfArchiveClients; i++)
+            {
+                executorService.execute(() ->
+                {
+                    AeronArchive.connect();
+                    latch.countDown();
+                });
+            }
+
+            latch.await(10, TimeUnit.SECONDS);
+
+            assertThat(latch.getCount(), is(0L));
+        }
+        finally
+        {
+            archiveCtx.deleteArchiveDirectory();
+            driverCtx.deleteAeronDirectory();
+        }
+    }
 }