Look at oldest send operation, rather than number of running ones

4 files changed, 33 insertions, 17 deletions

diff --git a/vespa-http-client/src/main/java/com/yahoo/vespa/http/client/core/api/FeedClientImpl.java b/vespa-http-client/src/main/java/com/yahoo/vespa/http/client/core/api/FeedClientImpl.java
index eaf869bdcdc..e4a3f91c33e 100644
--- a/vespa-http-client/src/main/java/com/yahoo/vespa/http/client/core/api/FeedClientImpl.java
+++ b/vespa-http-client/src/main/java/com/yahoo/vespa/http/client/core/api/FeedClientImpl.java
@@ -12,6 +12,7 @@ import java.nio.charset.CharsetEncoder;
 import java.nio.charset.CodingErrorAction;
 import java.nio.charset.StandardCharsets;
 import java.time.Instant;
+import java.util.Optional;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 
@@ -60,14 +61,13 @@ public class FeedClientImpl implements FeedClient {
     @Override
     public void close() {
         Instant lastResultReceived = Instant.now();
-        long lastNumberOfResults = operationProcessor.getIncompleteResultQueueSize();
+        Optional<String> oldestIncompleteId = operationProcessor.oldestIncompleteResultId();
 
-        while (waitForOperations(lastResultReceived, lastNumberOfResults, sleepTimeMs, closeTimeoutMs)) {
-            long results = operationProcessor.getIncompleteResultQueueSize();
-            if (results != lastNumberOfResults) {
+        while (oldestIncompleteId.isPresent() && waitForOperations(lastResultReceived, sleepTimeMs, closeTimeoutMs)) {
+            Optional<String> oldestIncompleteIdNow = operationProcessor.oldestIncompleteResultId();
+            if ( ! oldestIncompleteId.equals(oldestIncompleteIdNow))
                 lastResultReceived = Instant.now();
-            }
-            lastNumberOfResults = results;
+            oldestIncompleteId = oldestIncompleteIdNow;
         }
         operationProcessor.close();
     }
@@ -78,10 +78,7 @@ public class FeedClientImpl implements FeedClient {
     }
 
     // On return value true, wait more. Public for testing.
-    public static boolean waitForOperations(Instant lastResultReceived, long lastNumberOfResults, long sleepTimeMs, long closeTimeoutMs) {
-        if (lastNumberOfResults == 0) {
-            return false;
-        }
+    public static boolean waitForOperations(Instant lastResultReceived, long sleepTimeMs, long closeTimeoutMs) {
         if (lastResultReceived.plusMillis(closeTimeoutMs).isBefore(Instant.now())) {
             return false;
         }
diff --git a/vespa-http-client/src/main/java/com/yahoo/vespa/http/client/core/operationProcessor/OperationProcessor.java b/vespa-http-client/src/main/java/com/yahoo/vespa/http/client/core/operationProcessor/OperationProcessor.java
index cff6ad2ed48..24f27196394 100644
--- a/vespa-http-client/src/main/java/com/yahoo/vespa/http/client/core/operationProcessor/OperationProcessor.java
+++ b/vespa-http-client/src/main/java/com/yahoo/vespa/http/client/core/operationProcessor/OperationProcessor.java
@@ -18,8 +18,11 @@ import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Random;
 import java.util.Set;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
@@ -35,7 +38,7 @@ import java.util.logging.Logger;
 public class OperationProcessor {
 
     private static final Logger log = Logger.getLogger(OperationProcessor.class.getName());
-    private final Map<String, DocumentSendInfo> docSendInfoByOperationId = new HashMap<>();
+    private final Map<String, DocumentSendInfo> docSendInfoByOperationId = new LinkedHashMap<>();
     private final ArrayListMultimap<String, Document> blockedDocumentsByDocumentId = ArrayListMultimap.create();
     private final Set<String> inflightDocumentIds = new HashSet<>();
     private final int numDestinations;
@@ -103,6 +106,15 @@ public class OperationProcessor {
         }
     }
 
+    /** Returns the id of the oldest operation to be sent. */
+    public Optional<String> oldestIncompleteResultId() {
+        synchronized (monitor) {
+            return Optional.of(docSendInfoByOperationId.keySet().iterator())
+                           .filter(Iterator::hasNext)
+                           .map(Iterator::next);
+        }
+    }
+
     public String getClientId() {
         return clientId;
     }
diff --git a/vespa-http-client/src/test/java/com/yahoo/vespa/http/client/core/api/FeedClientImplTest.java b/vespa-http-client/src/test/java/com/yahoo/vespa/http/client/core/api/FeedClientImplTest.java
index 2eb4d243ee3..b8470fd489f 100644
--- a/vespa-http-client/src/test/java/com/yahoo/vespa/http/client/core/api/FeedClientImplTest.java
+++ b/vespa-http-client/src/test/java/com/yahoo/vespa/http/client/core/api/FeedClientImplTest.java
@@ -17,16 +17,12 @@ public class FeedClientImplTest {
 
     @Test
     public void testCloseWaitTimeOldTimestamp() {
-        assertThat(FeedClientImpl.waitForOperations(Instant.now().minusSeconds(1000), 1, sleepValueMillis, 10), is(false));
+        assertThat(FeedClientImpl.waitForOperations(Instant.now().minusSeconds(1000), sleepValueMillis, 10), is(false));
     }
 
     @Test
     public void testCloseWaitTimeOutInFutureStillOperations() {
-        assertThat(FeedClientImpl.waitForOperations(Instant.now(), 1, sleepValueMillis, 2000), is(true));
+        assertThat(FeedClientImpl.waitForOperations(Instant.now(), sleepValueMillis, 2000), is(true));
     }
 
-    @Test
-    public void testCloseWaitZeroOperations() {
-        assertThat(FeedClientImpl.waitForOperations(Instant.now(), 0, sleepValueMillis, 2000), is(false));
-    }
 }
diff --git a/vespa-http-client/src/test/java/com/yahoo/vespa/http/client/core/operationProcessor/OperationProcessorTest.java b/vespa-http-client/src/test/java/com/yahoo/vespa/http/client/core/operationProcessor/OperationProcessorTest.java
index 774a516cc14..3a335aa5da0 100644
--- a/vespa-http-client/src/test/java/com/yahoo/vespa/http/client/core/operationProcessor/OperationProcessorTest.java
+++ b/vespa-http-client/src/test/java/com/yahoo/vespa/http/client/core/operationProcessor/OperationProcessorTest.java
@@ -11,6 +11,7 @@ import com.yahoo.vespa.http.client.core.EndpointResult;
 import org.junit.Test;
 
 import java.util.ArrayDeque;
+import java.util.Optional;
 import java.util.Queue;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
@@ -19,6 +20,7 @@ import java.util.concurrent.TimeUnit;
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.hamcrest.core.Is.is;
 import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
 import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.anyLong;
 import static org.mockito.Mockito.mock;
@@ -173,12 +175,15 @@ public class OperationProcessorTest {
         assertThat(queue.size(), is(0));
         // Only one operations should be in flight.
         assertThat(operationProcessor.getIncompleteResultQueueSize(), is(1));
+        assertThat(operationProcessor.oldestIncompleteResultId(), is(Optional.of(doc1.getOperationId())));
         operationProcessor.resultReceived(new EndpointResult(doc1.getOperationId(), new Result.Detail(Endpoint.create("host"))), 0);
         assertThat(queue.size(), is(1));
         assertThat(operationProcessor.getIncompleteResultQueueSize(), is(1));
+        assertThat(operationProcessor.oldestIncompleteResultId(), is(Optional.of(doc1b.getOperationId())));
         operationProcessor.resultReceived(new EndpointResult(doc1b.getOperationId(), new Result.Detail(Endpoint.create("host"))), 0);
         assertThat(queue.size(), is(2));
         assertThat(operationProcessor.getIncompleteResultQueueSize(), is(0));
+        assertThat(operationProcessor.oldestIncompleteResultId(), is(Optional.empty()));
         // This should have no effect.
         operationProcessor.resultReceived(new EndpointResult(doc1.getOperationId(), new Result.Detail(Endpoint.create("host"))), 0);
         operationProcessor.resultReceived(new EndpointResult(doc1b.getOperationId(), new Result.Detail(Endpoint.create("host"))), 0);
@@ -239,18 +244,24 @@ public class OperationProcessorTest {
 
         assertThat(queue.size(), is(0));
         assertThat(operationProcessor.getIncompleteResultQueueSize(), is(3));
+        assertThat(operationProcessor.oldestIncompleteResultId(), is(Optional.of(doc1.getOperationId())));
         // This should have no effect since it should not be sent.
         operationProcessor.resultReceived(new EndpointResult(doc1b.getOperationId(), new Result.Detail(endpoint)), 0);
         assertThat(operationProcessor.getIncompleteResultQueueSize(), is(3));
+        assertThat(operationProcessor.oldestIncompleteResultId(), is(Optional.of(doc1.getOperationId())));
 
         operationProcessor.resultReceived(new EndpointResult(doc3.getOperationId(), new Result.Detail(endpoint)), 0);
         assertThat(operationProcessor.getIncompleteResultQueueSize(), is(2));
+        assertThat(operationProcessor.oldestIncompleteResultId(), is(Optional.of(doc1.getOperationId())));
         operationProcessor.resultReceived(new EndpointResult(doc2.getOperationId(), new Result.Detail(endpoint)), 0);
         assertThat(operationProcessor.getIncompleteResultQueueSize(), is(1));
+        assertThat(operationProcessor.oldestIncompleteResultId(), is(Optional.of(doc1.getOperationId())));
         operationProcessor.resultReceived(new EndpointResult(doc1.getOperationId(), new Result.Detail(endpoint)), 0);
         assertThat(operationProcessor.getIncompleteResultQueueSize(), is(1));
+        assertThat(operationProcessor.oldestIncompleteResultId(), is(Optional.of(doc1b.getOperationId())));
         operationProcessor.resultReceived(new EndpointResult(doc1b.getOperationId(), new Result.Detail(endpoint)), 0);
         assertThat(operationProcessor.getIncompleteResultQueueSize(), is(0));
+        assertThat(operationProcessor.oldestIncompleteResultId(), is(Optional.empty()));
     }
 
     @Test