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From "Nicolas Liochon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8769) Calculates the client write buffer size from the number of region
Date Wed, 19 Jun 2013 16:37:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13688137#comment-13688137

Nicolas Liochon commented on HBASE-8769:

It would be a good thing to do, but it seems non trivial to me:

With a scenario like: 3 tables of 50 regions each. I read from the first two and write in
the third, using the default config everywhere. HBase cannot know that the first two write
buffers will remain empty, so it may lowers the memory available for the 3rd table while it's
not necessary.

Or, if we want to have a global view in real time we will have to add some synchronisation
at the HConnection level (i.e: AtomicLong or so), likely for each inserts.

Today, we're pushing this to the user... Agreed it's not perfect.

> Calculates the client write buffer size from the number of region
> -----------------------------------------------------------------
>                 Key: HBASE-8769
>                 URL: https://issues.apache.org/jira/browse/HBASE-8769
>             Project: HBase
>          Issue Type: Improvement
>          Components: Client
>    Affects Versions: 0.98.0, 0.95.1
>            Reporter: Nicolas Liochon
>            Assignee: Nicolas Liochon
> The default size is ~2Mb. There are two issues:
> 1) It has not changed for a few years, while the memory available has increased
> 2) It's a fixed size, that does not take into account the number of region.
> I think we should have something like 100Kb per region, with a max at 6Mb, all this configurable
of course.
> I plan to do this after HBASE-6295

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