fix: Remove flushAll method (#850)

* .

* .

* .

Author: yirutang

google-cloud-bigquerystorage/clirr-ignored-differences.xml

@@ -23,4 +23,9 @@
         <from>com.google.protobuf.DynamicMessage convertJsonToProtoMessage(com.google.protobuf.Descriptors$Descriptor, org.json.JSONObject, boolean)</from>
         <to>com.google.protobuf.DynamicMessage convertJsonToProtoMessage(com.google.protobuf.Descriptors$Descriptor, org.json.JSONObject)</to>
     </difference>
+    <difference>
+        <className>com/google/cloud/bigquery/storage/v1beta2/StreamWriter</className>
+        <differenceType>7002</differenceType>
+        <method>void flushAll(long)</method>
+    </difference>
 </differences>

google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1beta2/StreamWriter.java

@@ -272,37 +272,9 @@ public ApiFuture<AppendRowsResponse> append(AppendRowsRequest message) {
       messagesBatchLock.unlock();
       appendAndRefreshAppendLock.unlock();
     }
-
     return outstandingAppend.appendResult;
   }
 
-  /**
-   * This is the general flush method for asynchronise append operation. When you have outstanding
-   * append requests, calling flush will make sure all outstanding append requests completed and
-   * successful. Otherwise there will be an exception thrown.
-   *
-   * @throws Exception
-   */
-  public void flushAll(long timeoutMillis) throws Exception {
-    appendAndRefreshAppendLock.lock();
-    try {
-      writeAllOutstanding();
-      synchronized (messagesWaiter) {
-        messagesWaiter.waitComplete(timeoutMillis);
-      }
-    } finally {
-      appendAndRefreshAppendLock.unlock();
-    }
-    exceptionLock.lock();
-    try {
-      if (streamException != null) {
-        throw new Exception(streamException);
-      }
-    } finally {
-      exceptionLock.unlock();
-    }
-  }
-
   /**
    * Re-establishes a stream connection.
    *

google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1beta2/StreamWriterTest.java

@@ -863,44 +863,6 @@ public void testExistingClient() throws Exception {
     client.awaitTermination(1, TimeUnit.MINUTES);
   }
 
-  @Test
-  public void testFlushAll() throws Exception {
-    StreamWriter writer =
-        getTestStreamWriterBuilder()
-            .setBatchingSettings(
-                StreamWriter.Builder.DEFAULT_BATCHING_SETTINGS
-                    .toBuilder()
-                    .setElementCountThreshold(2L)
-                    .setDelayThreshold(Duration.ofSeconds(100000))
-                    .build())
-            .build();
-
-    testBigQueryWrite.addResponse(
-        AppendRowsResponse.newBuilder()
-            .setAppendResult(
-                AppendRowsResponse.AppendResult.newBuilder().setOffset(Int64Value.of(0)).build())
-            .build());
-    testBigQueryWrite.addResponse(
-        AppendRowsResponse.newBuilder()
-            .setAppendResult(
-                AppendRowsResponse.AppendResult.newBuilder().setOffset(Int64Value.of(2)).build())
-            .build());
-    testBigQueryWrite.addResponse(
-        AppendRowsResponse.newBuilder()
-            .setAppendResult(
-                AppendRowsResponse.AppendResult.newBuilder().setOffset(Int64Value.of(3)).build())
-            .build());
-
-    ApiFuture<AppendRowsResponse> appendFuture1 = sendTestMessage(writer, new String[] {"A"});
-    ApiFuture<AppendRowsResponse> appendFuture2 = sendTestMessage(writer, new String[] {"B"});
-    ApiFuture<AppendRowsResponse> appendFuture3 = sendTestMessage(writer, new String[] {"C"});
-    assertFalse(appendFuture3.isDone());
-    writer.flushAll(100000);
-    assertTrue(appendFuture3.isDone());
-
-    writer.close();
-  }
-
   @Test
   public void testDatasetTraceId() throws Exception {
     StreamWriter writer =