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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10994) HBase Multi-Tenancy
Date Wed, 16 Apr 2014 04:03:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13970397#comment-13970397

Andrew Purtell commented on HBASE-10994:

On namespaces, the document says:
Namespaces: Will not be mentioned much in this document, since we are considering the smallest
unity of scalability to make the examples, and namespaces are just a group of tables, so everytime
you see “Table” you can replace it with “Namespace”. A rule applied to a namespace
will be applied to all the tables in it.

Elsewhere, on quotas:
>From an implementation point of view quotas will be part of scheduling, since we have
to block/limit/throttle incoming requests based on the usage. The simplest way to implement
quotas is by using a “token bucket” algorithm (but we will have an interface to make it

What happens if there is a quota on a namespace, and quotas on tables within?

> HBase Multi-Tenancy
> -------------------
>                 Key: HBASE-10994
>                 URL: https://issues.apache.org/jira/browse/HBASE-10994
>             Project: HBase
>          Issue Type: Umbrella
>            Reporter: Matteo Bertozzi
>            Assignee: Matteo Bertozzi
>            Priority: Minor
>              Labels: multitenancy, quota
> Currently HBase treats all tables, users, and workloads in the same way.
> This is ok, until multiple users and workloads are applied on the same cluster/table.
Some workloads/users must be prioritized over others, and some other workloads must not impact
> We can separate the problem into three components.
>  * Isolation/Partitioning (Physically split on different machines)
>  * Scheduling (Prioritize small/interactive workloads vs long/batch workloads)
>  * Quotas (Limit a user/table requests/sec or size)
> This is the umbrella jira tracking the multi-tenancy related tasks.
> An initial design document is up for comments here: https://docs.google.com/document/d/1ygIwZpDWQuMPdfcryckic6ODi5DHQkrzXKjmOJodfs0

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