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Posted to user@storm.apache.org by Gireesh Ramji <gi...@yahoo.com> on 2016/03/08 04:29:16 UTC

Token awareness of storm bolts

In my topology, I have a bolt that subscribes from its predecessor using a fields grouping. Is there an easy way for me to know, in the bolt's execute method, the range of keys that will get hashed to a given instance of the bolt under the fields grouping?
ThanksGireesh

Re: Token awareness of storm bolts

Posted by Nathan Leung <nc...@gmail.com>.

No. Hash function can be applied to any object, assuming it has a suitable
implementation defined, so it is impossible to define a "range". Also,
that's not how hash functions work.
On Mar 7, 2016 10:29 PM, "Gireesh Ramji" <gi...@yahoo.com> wrote:

> In my topology, I have a bolt that subscribes from its predecessor using a
> fields grouping. Is there an easy way for me to know, in the bolt's execute
> method, the range of keys that will get hashed to a given instance of the
> bolt under the fields grouping?
>
> Thanks
> Gireesh
>