Github user zentol commented on the pull request:
https://github.com/apache/flink/pull/1378#issuecomment-157726222
it appears that one already includes the exchange mode.
```
...
if (operatorLevelCaching != null) {
gen.writeStringField("caching", operatorLevelCaching);
}
gen.writeStringField("exchange",
edge.getSource().getResultType().name().toLowerCase());
gen.writeEndObject();
...
```
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