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https://issues.apache.org/jira/browse/SCB-234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16326858#comment-16326858
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ASF GitHub Bot commented on SCB-234:
------------------------------------
seanyinx commented on a change in pull request #120: SCB-234 fail fast at
SagaStart if all alpha clusters are down
URL:
https://github.com/apache/incubator-servicecomb-saga/pull/120#discussion_r161683808
##########
File path:
omega/omega-connector/omega-connector-grpc/src/main/java/org/apache/servicecomb/saga/omega/connector/grpc/RetryableMessageSender.java
##########
@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.servicecomb.saga.omega.connector.grpc;
+
+import static org.apache.servicecomb.saga.common.EventType.SagaStartedEvent;
+
+import java.util.concurrent.BlockingQueue;
+
+import org.apache.servicecomb.saga.omega.transaction.AlphaResponse;
+import org.apache.servicecomb.saga.omega.transaction.MessageSender;
+import org.apache.servicecomb.saga.omega.transaction.OmegaException;
+import org.apache.servicecomb.saga.omega.transaction.TxEvent;
+
+public class RetryableMessageSender implements MessageSender {
+ private final BlockingQueue<MessageSender> availableMessageSenders;
+
+ public RetryableMessageSender(BlockingQueue<MessageSender>
availableMessageSenders) {
+ this.availableMessageSenders = availableMessageSenders;
+ }
+
+ @Override
+ public AlphaResponse send(TxEvent event) {
+ if (event.type() == SagaStartedEvent) {
+ throw new OmegaException("Failed to process subsequent requests because
no alpha server is available");
Review comment:
this exception needs to be caught by saga annotation processor and rethrow
as TransactionalException
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> [pack] fail fast if alpha cluster down
> --------------------------------------
>
> Key: SCB-234
> URL: https://issues.apache.org/jira/browse/SCB-234
> Project: Apache ServiceComb
> Issue Type: Improvement
> Components: Saga
> Reporter: Yin Xiang
> Assignee: Eric Lee
> Priority: Major
> Fix For: saga-0.1.0
>
>
> when alpha cluster is down, future transactions should fail immediately at
> @SagaStart instead of keep retrying, in order not to stress the services
> further by blocking all the request threads.
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