forked from apache/flink
/
StreamGraphUserHashHasher.java
57 lines (48 loc) · 2.09 KB
/
StreamGraphUserHashHasher.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
/*
* 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.streaming.api.graph;
import org.apache.flink.util.StringUtils;
import java.util.HashMap;
import java.util.Map;
/**
* StreamGraphHasher that works with user provided hashes. This is useful in case we want to set (alternative) hashes
* explicitly, e.g. to provide a way of manual backwards compatibility between versions when the mechanism of generating
* hashes has changed in an incompatible way.
*
*/
public class StreamGraphUserHashHasher implements StreamGraphHasher {
@Override
public Map<Integer, byte[]> traverseStreamGraphAndGenerateHashes(StreamGraph streamGraph) {
HashMap<Integer, byte[]> hashResult = new HashMap<>();
for (StreamNode streamNode : streamGraph.getStreamNodes()) {
String userHash = streamNode.getUserHash();
if (null != userHash) {
for (StreamEdge inEdge : streamNode.getInEdges()) {
if (StreamingJobGraphGenerator.isChainable(inEdge, streamGraph)) {
throw new UnsupportedOperationException("Cannot assign user-specified hash "
+ "to intermediate node in chain. This will be supported in future "
+ "versions of Flink. As a work around start new chain at task "
+ streamNode.getOperatorName() + ".");
}
}
hashResult.put(streamNode.getId(), StringUtils.hexStringToByte(userHash));
}
}
return hashResult;
}
}