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From "Christopher Tubbs (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-1495) Host multiple read-only versions of tablets for query performance
Date Fri, 09 Sep 2016 20:47:20 GMT


Christopher Tubbs commented on ACCUMULO-1495:

Yes, it's a completely separate solution for the same basic problem of query performance.
It's probably worth mentioning such alternatives here, because I think other solutions should
be considered first before multiple-hosting. Multiple-hosting is so complex and error-prone,
I'd hate to consider it as a primary option.

Although I think it's probably worth mentioning them here, if other ideas can be fleshed out
to the point where they are sufficiently articulable as a proposal (or area of investigation),
then yes, they deserve their own JIRA. (I've created ACCUMULO-4452 for this one.)

> Host multiple read-only versions of tablets for query performance
> -----------------------------------------------------------------
>                 Key: ACCUMULO-1495
>                 URL:
>             Project: Accumulo
>          Issue Type: New Feature
>            Reporter: Christopher Tubbs
> It might be worth providing read-only views of tablets on multiple servers, while writes
go to a single authoritative server. This could improve query performance in some cases.
> Some things to consider:
> # Consistency: can I read what I've just written?
> # Configuration: how many copies?
> # Configuration: how long between syncs?
> # Performance: locality, number of file replicas
> Variation:
> Permit multiple hosting only on tables that have been locked for writes (useful with
a strictly enforced clone-and-lock feature).

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