feat: temp workaround for omg/48020 (#1521)

This should only be used by customer who is affected by omg/48020 (connection stuck after 10MB) using JsonWriter directly, before fix finished rolling out on Friday 2/11. It can be enabled by calling JsonWriter.setReconnectOnStuck(true). 

The write performance will be impacted by this change, but it can work around the stuckness.

google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/JsonStreamWriter.java

@@ -53,6 +53,10 @@ public class JsonStreamWriter implements AutoCloseable {
   private Descriptor descriptor;
   private TableSchema tableSchema;
   private boolean ignoreUnknownFields = false;
+  private boolean reconnectAfter10M = false;
+  private long totalMessageSize = 0;
+  private long absTotal = 0;
+  private ProtoSchema protoSchema;
 
   /**
    * Constructs the JsonStreamWriter
@@ -71,7 +75,9 @@ private JsonStreamWriter(Builder builder)
     } else {
       streamWriterBuilder = StreamWriter.newBuilder(builder.streamName, builder.client);
     }
-    streamWriterBuilder.setWriterSchema(ProtoSchemaConverter.convert(this.descriptor));
+    this.protoSchema = ProtoSchemaConverter.convert(this.descriptor);
+    this.totalMessageSize = protoSchema.getSerializedSize();
+    streamWriterBuilder.setWriterSchema(protoSchema);
     setStreamWriterSettings(
         builder.channelProvider,
         builder.credentialsProvider,
@@ -82,6 +88,7 @@ private JsonStreamWriter(Builder builder)
     this.streamName = builder.streamName;
     this.tableSchema = builder.tableSchema;
     this.ignoreUnknownFields = builder.ignoreUnknownFields;
+    this.reconnectAfter10M = builder.reconnectAfter10M;
   }
 
   /**
@@ -122,27 +129,46 @@ public ApiFuture<AppendRowsResponse> append(JSONArray jsonArr, long offset)
         this.tableSchema = updatedSchema;
         this.descriptor =
             BQTableSchemaToProtoDescriptor.convertBQTableSchemaToProtoDescriptor(updatedSchema);
+        this.protoSchema = ProtoSchemaConverter.convert(this.descriptor);
+        this.totalMessageSize = protoSchema.getSerializedSize();
         // Create a new underlying StreamWriter with the updated TableSchema and Descriptor
-        this.streamWriter =
-            streamWriterBuilder
-                .setWriterSchema(ProtoSchemaConverter.convert(this.descriptor))
-                .build();
+        this.streamWriter = streamWriterBuilder.setWriterSchema(this.protoSchema).build();
       }
     }
 
     ProtoRows.Builder rowsBuilder = ProtoRows.newBuilder();
     // Any error in convertJsonToProtoMessage will throw an
     // IllegalArgumentException/IllegalStateException/NullPointerException and will halt processing
     // of JSON data.
+    long currentRequestSize = 0;
     for (int i = 0; i < jsonArr.length(); i++) {
       JSONObject json = jsonArr.getJSONObject(i);
       Message protoMessage =
           JsonToProtoMessage.convertJsonToProtoMessage(
               this.descriptor, this.tableSchema, json, ignoreUnknownFields);
       rowsBuilder.addSerializedRows(protoMessage.toByteString());
+      currentRequestSize += protoMessage.getSerializedSize();
     }
     // Need to make sure refreshAppendAndSetDescriptor finish first before this can run
     synchronized (this) {
+      this.totalMessageSize += currentRequestSize;
+      this.absTotal += currentRequestSize;
+      // Reconnect on every 9.5MB.
+      if (this.totalMessageSize > 9500000 && this.reconnectAfter10M) {
+        streamWriter.close();
+        // Create a new underlying StreamWriter aka establish a new connection.
+        this.streamWriter = streamWriterBuilder.setWriterSchema(protoSchema).build();
+        this.totalMessageSize = this.protoSchema.getSerializedSize() + currentRequestSize;
+        this.absTotal += currentRequestSize;
+        // Allow first request to pass.
+      }
+      LOG.fine(
+          "Sending a total of:"
+              + this.totalMessageSize
+              + " "
+              + currentRequestSize
+              + " "
+              + this.absTotal);
       final ApiFuture<AppendRowsResponse> appendResponseFuture =
           this.streamWriter.append(rowsBuilder.build(), offset);
       return appendResponseFuture;
@@ -264,6 +290,7 @@ public static final class Builder {
     private boolean createDefaultStream = false;
     private String traceId;
     private boolean ignoreUnknownFields = false;
+    private boolean reconnectAfter10M = false;
 
     private static String streamPatternString =
         "(projects/[^/]+/datasets/[^/]+/tables/[^/]+)/streams/[^/]+";
@@ -377,6 +404,19 @@ public Builder setIgnoreUnknownFields(boolean ignoreUnknownFields) {
       return this;
     }
 
+    /**
+     * Setter for a reconnectAfter10M, temporaily workaround for omg/48020. Fix for the omg is
+     * supposed to roll out by 2/11/2022 Friday. If you set this to True, your write will be slower
+     * (0.75MB/s per connection), but your writes will not be stuck as a sympton of omg/48020.
+     *
+     * @param reconnectAfter10M
+     * @return Builder
+     */
+    public Builder setReconnectAfter10M(boolean reconnectAfter10M) {
+      this.reconnectAfter10M = reconnectAfter10M;
+      return this;
+    }
+
     /**
      * Builds JsonStreamWriter
      *

google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1/it/ITBigQueryWriteManualClientTest.java

@@ -412,6 +412,58 @@ public void testJsonStreamWriterWithDefaultStream()
     }
   }
 
+  // This test runs about 1 min.
+  @Test
+  public void testJsonStreamWriterWithMessagesOver10M()
+      throws IOException, InterruptedException, ExecutionException,
+          Descriptors.DescriptorValidationException {
+    String tableName = "TableLarge";
+    TableId tableId = TableId.of(DATASET, tableName);
+    Field col1 = Field.newBuilder("col1", StandardSQLTypeName.STRING).build();
+    Schema schema = Schema.of(col1);
+    TableInfo tableInfo = TableInfo.newBuilder(tableId, StandardTableDefinition.of(schema)).build();
+    bigquery.create(tableInfo);
+    TableName parent = TableName.of(ServiceOptions.getDefaultProjectId(), DATASET, tableName);
+
+    WriteStream writeStream =
+        client.createWriteStream(
+            CreateWriteStreamRequest.newBuilder()
+                .setParent(parent.toString())
+                .setWriteStream(
+                    WriteStream.newBuilder().setType(WriteStream.Type.COMMITTED).build())
+                .build());
+    int totalRequest = 10;
+    int rowBatch = 40000;
+    ArrayList<ApiFuture<AppendRowsResponse>> allResponses =
+        new ArrayList<ApiFuture<AppendRowsResponse>>(totalRequest);
+    // Sends a total of 30MB over the wire.
+    try (JsonStreamWriter jsonStreamWriter =
+        JsonStreamWriter.newBuilder(writeStream.getName(), writeStream.getTableSchema())
+            .setReconnectAfter10M(true)
+            .build()) {
+      for (int k = 0; k < totalRequest; k++) {
+        JSONObject row = new JSONObject();
+        row.put("col1", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
+        JSONArray jsonArr = new JSONArray();
+        // 3MB batch.
+        for (int j = 0; j < rowBatch; j++) {
+          jsonArr.put(row);
+        }
+        LOG.info("Appending: " + k + "/" + totalRequest);
+        allResponses.add(jsonStreamWriter.append(jsonArr, k * rowBatch));
+      }
+    }
+    LOG.info("Waiting for all responses to come back");
+    for (int i = 0; i < totalRequest; i++) {
+      try {
+        Assert.assertEquals(
+            allResponses.get(i).get().getAppendResult().getOffset().getValue(), i * rowBatch);
+      } catch (ExecutionException ex) {
+        Assert.fail("Unexpected error " + ex);
+      }
+    }
+  }
+
   @Test
   public void testJsonStreamWriterSchemaUpdate()
       throws DescriptorValidationException, IOException, InterruptedException, ExecutionException {