I actually thought that this has been improved (not fixed ;)) some time ago. My mistake. Thanks for the update and checking again.
On 19 Jun 2015, at 13:47, Fabian Hueske <
[hidden email]> wrote:
> This is not a bug. Chained combiners are not supported for ReduceFunctions
> yet. :-(
> I updated the JIRA accordingly.
>
> 2015-06-19 13:04 GMT+02:00 Ufuk Celebi <
[hidden email]>:
>
>> Hey all,
>>
>> on the current master running the WordCount example with a text file
>> input/output results and a manual reduce function (instead of the sum(1))
>> results in a combiner, which is not chained.
>>
>> The corresponding issue is here:
>>
https://issues.apache.org/jira/browse/FLINK-2246>>
>> Can someone please confirm this? If it is an issue, we should fix it soon.
>> The serialization overhead is noticeable on larger inputs.
>>
>> – Ufuk