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From Ted Yu <yuzhih...@gmail.com>
Subject Re: How fast and safe online schema changes are?
Date Wed, 18 Jan 2017 16:19:41 GMT
On a 5 node hbase 1.1.2 cluster, I created a table with 2000 regions.

Then I issued the following command in shell:

alter 'user', NAME => 'cf', VERSIONS => 5

Here was the output:

http://pastebin.com/Ph06M8eX

My cluster was not loaded.

YMMV



On Tue, Jan 17, 2017 at 2:04 AM, nh kim <honey.and.sw@gmail.com> wrote:

> Hi All,
>
> I’m planning to use HBase online schema changes, and going to ALTER TABLE,
> especially ADD COLUMNs, on Phoenix.
>
> Because my project handles quite a big dataset,
> I want to make sure HBase supports quick and smooth schema changes without
> disabling tables,
> just as general RDMBS supports column modifications with very trivial
> delay.
>
> It’ll be perfect if there is any performance or benchmark documentation.
> But your any opinion or experience of that will be very helpful.
>
> Thanks!
> NaHeon
>

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