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https://issues.apache.org/jira/browse/FLINK-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15024590#comment-15024590
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ASF GitHub Bot commented on FLINK-2837:
---------------------------------------
Github user mjsax commented on a diff in the pull request:
https://github.com/apache/flink/pull/1398#discussion_r45740805
--- 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 --
Yes. :) For example, 2 fields for one input and 3 fields for the other
input. (The idea is to have different number for both inputs to make sure the
input schemas of both can differ not only by their types and also by their
number of attributes)
> 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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