hedged reads

[rahul gidwani <ra...@gmail.com>]

Sometimes with downed hosts, there is a few second delay from the client
(which is okay for most situations). But some requests can not tolerate
this delay and need to detect failure very quickly.

I was wondering if the community would be interested in allowing for the
client to perform hedged reads (configurable) if needed.

This could satisfy those situations where you can tolerate some latency for
most of your requests, but also accommodate those requests that have more
strict latency guarantees.

If interested we could discuss the design and proposed implementation
details but right now am just wondering if the community would be
interested in such a feature.

Thanks
rahul

Re: hedged reads

[Patrick Hunt <ph...@apache.org>]

Sounds interesting. Can you give some concrete example(s)? Are you
proposing hedged reads across servers? If so how will you handle the
fact that you could read old data? (lagging follower)

Patrick

On Wed, May 4, 2016 at 4:31 PM, rahul gidwani <ra...@gmail.com> wrote:
> Sometimes with downed hosts, there is a few second delay from the client
> (which is okay for most situations). But some requests can not tolerate
> this delay and need to detect failure very quickly.
>
> I was wondering if the community would be interested in allowing for the
> client to perform hedged reads (configurable) if needed.
>
> This could satisfy those situations where you can tolerate some latency for
> most of your requests, but also accommodate those requests that have more
> strict latency guarantees.
>
> If interested we could discuss the design and proposed implementation
> details but right now am just wondering if the community would be
> interested in such a feature.
>
> Thanks
> rahul