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From Chen Bekor <chen.be...@gmail.com>
Subject Re: design question
Date Sun, 24 Apr 2016 19:57:46 GMT
cool - can you point me to some docs about how to configure Rocks DB? I
searched the online docs and found nothing substantial. Also - If I'm using
HDFS (S3backed ) cluster, how would that effect RocksDB? can I configure it
to run on optimized SSD etc?

any help is appreciated.

On Sun, Apr 24, 2016 at 7:57 AM, John Sherwood <jrs@vt.edu> wrote:

> This sounds like you have some per-key state to keep track of, so the
> 'correct' way to do it would be to keyBy the guid. I believe that if you
> run your environment using the Rocks DB state backend you will not OOM
> regardless of the number of GUIDs that are eventually tracked. Whether
> flink/stream processing is the most effective way to achieve your goal, I
> can't say, but I am fairly confident that this particular aspect is not a
> problem.
> On Sat, Apr 23, 2016 at 1:13 AM, Chen Bekor <chen.bekor@gmail.com> wrote:
>> hi all,
>> I have a stream of incoming object versions (objects change over time)
>> and a requirement to fetch from a datastore the last known object version
>> in order to link it with the id of the new version,  so that I end up with
>> a linked list of object versions.
>> all object versions contain the same guid, so I was thinking about using
>> flink streaming in order to assure ordering and avoid concurrency / race
>> conditions in the linkage process (object version might arrive unordered or
>> may arrive at spikes)
>> if I use the object guid as a key for a keyed stream I am concerned I
>> will end up with millions of windowed streams hence causing OOM.
>> what do you think should be the right approach? do you think flink is the
>> right technology for this task?

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