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From subash basnet <yasub...@gmail.com>
Subject Re: DataStreamUtils not working properly
Date Tue, 19 Jul 2016 20:13:37 GMT
Hello Till,

Yup I can see the log output in my console, but there is no information
there regarding if there is any error in conversion. Just normal warn and
info as below:
22:09:16,676 WARN  org.apache.flink.streaming.runtime.tasks.StreamTask
      - No state backend has been specified, using default state backend
(Memory / JobManager)
22:09:16,676 INFO  org.apache.flink.streaming.runtime.tasks.StreamTask
      - State backend is set to heap memory (checkpoint to jobmanager)

The above message is always there when I run my project. It would be great
if someone could check why the collection of datastream via DataStreamUtils
is giving empty result.

Best Regards,
Subash Basnet

On Tue, Jul 19, 2016 at 4:52 PM, Till Rohrmann <trohrmann@apache.org> wrote:

> It depends if you have a log4j.properties file specified in your
> classpath. If you see log output on the console, then it should also print
> errors there.
>
> Cheers,
> Till
>
> On Tue, Jul 19, 2016 at 3:08 PM, subash basnet <yasubash@gmail.com> wrote:
>
>> Hello Till,
>>
>> Shouldn't it write something in the eclipse console if there is any error
>> or warning. But nothing about error is printed on the console. And I
>> checked the flink project folder: flink-core, flink streaming as such but
>> couldn't find where the log is written when run via eclipse.
>>
>> Best Regards,
>> Subash Basnet
>>
>> On Tue, Jul 19, 2016 at 2:49 PM, Till Rohrmann <trohrmann@apache.org>
>> wrote:
>>
>>> Have you checked your logs whether they contain some problems? In
>>> general it is not recommended collecting the streaming result back to your
>>> client. It might also be a problem with `DataStreamUtils.collect`.
>>>
>>> Cheers,
>>> Till
>>>
>>> On Tue, Jul 19, 2016 at 2:42 PM, subash basnet <yasubash@gmail.com>
>>> wrote:
>>>
>>>> Hello all,
>>>>
>>>> I tried to check if it works for tuple but same problem, the collection
>>>> still shows blank result. I took the id of centroid tuple and printed it,
>>>> but the collection displays empty.
>>>>
>>>> DataStream<Centroid> centroids = newCentroidDataStream.map(new
>>>> TupleCentroidConverter());
>>>> DataStream<Tuple1<String>> centroidId = centroids.map(new TestMethod());
>>>> centroidId.print();
>>>> Iterator<Tuple1<String>> iter = DataStreamUtils.collect(centroidId);
>>>> Collection<Tuple1<String>> testCentroids = Lists.newArrayList(iter);
>>>> for (Tuple1<String> c : testCentroids) {
>>>> System.out.println(c);
>>>> }
>>>> Output: (Mon Jul 18 17:36:03 CEST 2016) (Mon Jul 18 17:43:58 CEST 2016)
>>>> (Mon Jul 18 17:42:59 CEST 2016) (Mon Jul 18 17:34:01 CEST 2016) (Mon Jul
18
>>>> 17:52:00 CEST 2016) (Mon Jul 18 17:40:58 CEST 2016) for centroidId.print(),
>>>> but no output for System.out.println(c); Best Regards, Subash Basnet
>>>>
>>>> On Tue, Jul 19, 2016 at 10:48 AM, subash basnet <yasubash@gmail.com>
>>>> wrote:
>>>>
>>>>> Hello all,
>>>>>
>>>>> I am trying to convert datastream to collection, but it's shows blank
>>>>> result. There is a stream of data which can be viewed on the console
on
>>>>> print(), but the collection of the same stream shows empty after
>>>>> conversion. Below is the code:
>>>>>
>>>>> DataStream<Centroid> centroids = newCentroidDataStream.map(new
>>>>> TupleCentroidConverter());
>>>>> centroids.print();
>>>>> Iterator<Centroid> iter = DataStreamUtils.collect(centroids);
>>>>> Collection<Centroid> testCentroids = Lists.newArrayList(iter);
>>>>> for(Centroid c: testCentroids){
>>>>> System.out.println(c);
>>>>> }
>>>>>
>>>>> The above *centroids.print()* gives the following output in console:
>>>>>
>>>>> Mon Jul 18 21:29:01 CEST 2016  119.3701 119.4 119.3701 119.38 27400.0
>>>>> Mon Jul 18 21:23:00 CEST 2016  119.3463 119.37 119.315 119.37 48200.0
>>>>> Mon Jul 18 21:27:59 CEST 2016  119.3401 119.3401 119.26 119.265 50300.0
>>>>> Mon Jul 18 21:36:00 CEST 2016  119.48 119.505 119.47 119.4741 37400.0
>>>>> Mon Jul 18 21:33:00 CEST 2016  119.535 119.54 119.445 119.455 152900.0
>>>>>
>>>>> But the next *System.out.println(c) *within the for loop prints
>>>>> nothing. What could be the problem.
>>>>>
>>>>> My maven has following configuration for dataStreamUtils:
>>>>> <dependency>
>>>>> <groupId>org.apache.flink</groupId>
>>>>> <artifactId>flink-streaming-contrib_2.10</artifactId>
>>>>> <version>${flink.version}</version>
>>>>> </dependency>
>>>>>
>>>>>
>>>>> Best Regards,
>>>>> Subash Basnet
>>>>>
>>>>>
>>>>
>>>
>>
>

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