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https://issues.apache.org/jira/browse/FLINK-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15024584#comment-15024584
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ASF GitHub Bot commented on FLINK-2837:
---------------------------------------
Github user mxm commented on a diff in the pull request:
https://github.com/apache/flink/pull/1398#discussion_r45740238
--- Diff:
flink-contrib/flink-storm-examples/src/main/java/org/apache/flink/storm/join/SingleJoinExample.java
---
@@ -0,0 +1,86 @@
+/**
+ * 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.flink.storm.join;
+
+import backtype.storm.Config;
+import backtype.storm.testing.FeederSpout;
+import backtype.storm.topology.TopologyBuilder;
+import backtype.storm.tuple.Fields;
+import backtype.storm.tuple.Values;
+import backtype.storm.utils.Utils;
+import org.apache.flink.storm.api.FlinkLocalCluster;
+import org.apache.flink.storm.api.FlinkTopology;
+import org.apache.flink.storm.util.BoltFileSink;
+import org.apache.flink.storm.util.TupleOutputFormatter;
+import storm.starter.bolt.PrinterBolt;
+import storm.starter.bolt.SingleJoinBolt;
+
+
+public class SingleJoinExample {
+
+ public static void main(String[] args) throws Exception {
+ final FeederSpout genderSpout = new FeederSpout(new
Fields("id", "gender"));
+ final FeederSpout ageSpout = new FeederSpout(new Fields("id",
"age"));
+
--- End diff --
You mean different number of fields?
> FlinkTopologyBuilder cannot handle multiple input streams
> ---------------------------------------------------------
>
> Key: FLINK-2837
> URL: https://issues.apache.org/jira/browse/FLINK-2837
> Project: Flink
> Issue Type: Bug
> Components: Storm Compatibility
> Reporter: Matthias J. Sax
> Assignee: Maximilian Michels
>
> FlinkTopologyBuilder cannot handle multiple input streams correctly. Instead
> of union the incoming streams, it replicates the consuming bolt and each
> (logical) instance processes one of the input streams.
> For example:
> {noformat}
> final FlinkTopologyBuilder builder = new FlinkTopologyBuilder();
> builder.setSpout(spoutId1, new FiniteRandomSpout(0, 10));
> builder.setSpout(spoutId2, new FiniteRandomSpout(1, 8));
> builder.setSpout(spoutId3, new FiniteRandomSpout(2, 13));
> builder.setBolt(boltId, new MergerBolt())
> .shuffleGrouping(spoutId1)
> .shuffleGrouping(spoutId2)
> .shuffleGrouping(spoutId3);
> builder.setBolt("sink", new BoltPrintSink(new SimpleOutputFormatter()))
> .shuffleGrouping(boltId);
> {noformat}
> will only print the data from a single source instead of all sources.
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