Hi Nhan,
You can store the max/min value using the value states of a
KeyedProcessFunction,
or in the global state of a ProcessWindowFunction.
On processing each item, compare its value to the current max/min and
update the stored value as needed.
Regards,
Kien
On 1/24/2019 12:37 AM, Thanh-Nhan Vo wrote:
Hi Kien Truong,
Thank you for your answer. I have another question, please !
If I count the number of messages processed for a given key j (denoted
c_j), is there a way to retrieve max{c_j}, min{c_j}?
Thanks
*De :*Kien Truong [mailto:duckientru...@gmail.com]
*Envoyé :* mercredi 23 janvier 2019 16:04
*À :* user@flink.apache.org
*Objet :* Re: [Flink 1.6] How to get current total number of processed
events
Hi Nhan,
Logically, the total number of processed events before an event cannot
be accurately calculated unless events processing are synchronized.
This is not scalable, so naturally I don't think Flink supports it.
Although, I suppose you can get an approximate count by using a
non-keyed TumblingWindow, count the item inside the window, then use
that value in the next window.
Regards,
Kien
On 1/21/2019 9:34 PM, Thanh-Nhan Vo wrote:
Hello all,
I have a question, please !
I’m using Flink 1.6 to process our data in streaming mode.
I wonder if at a given event, there is a way to get the current
total number of processed events (before this event).
If possible, I want to get this total number of processed events
as a value state in Keystream.
It means that for a given key in KeyStream, I want to retrieve not
only the total number of processed events for this key but also
the total number of processed events for all keys.
There is a way to do this in Flink 1.6, please!
Best regard,
Nhan
