GitHub user gaborhermann opened a pull request:
https://github.com/apache/flink/pull/994
[FLINK-2286] [streaming] Wrapped ParallelMerge into stream operator
Resolved the issue by wrapping the ParallelMerge function into a
StreamOperator and emitting the remaining records at the end of the data
processing.
This is not tested (automatically), as I could not reproduce the issue in a
deterministic way (due to its behaviour depending on time).
It can be reproduced by changing the streaming WordCount to use windows:
```java
final StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
DataStreamSource<String> text = env.fromElements(
"To be, or not to be,--that is the question:--",
"Whether 'tis nobler in the mind to suffer"
);
DataStream<Tuple2<String, Integer>> counts =
text.flatMap(new Tokenizer())
.window(Time.of(1000, TimeUnit.MILLISECONDS))
.groupBy(0)
.sum(1)
.flatten();
counts.print();
```
This topology would print nothing before the fix.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gaborhermann/flink FLINK-2286
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/994.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #994
----
commit 86096adb688d9233c77986c3012298ae00bfbba0
Author: Gábor Hermann <reckone...@gmail.com>
Date: 2015-08-06T13:42:54Z
[FLINK-2286] [streaming] Wrapped ParallelMerge into stream operator
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