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HBase >> mail # dev >> Pull instant schema updating out?


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Re: Pull instant schema updating out?
I agree with Lars' assessment.

On Apr 2, 2012, at 11:07 PM, lars hofhansl <[EMAIL PROTECTED]> wrote:

> I did a superficial review of HBASE-4213 and remember I was quite exited about the promise of the change at
> that time. If the problem is just with the MonitoredTask behavior (as indicated in HBASE-5702) I'd say we try to fix that.
>
> -- Lars
>
>
>
> ________________________________
> From: Stack <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]; lars hofhansl <[EMAIL PROTECTED]>
> Sent: Monday, April 2, 2012 9:05 PM
> Subject: Re: Pull instant schema updating out?
>
> On Mon, Apr 2, 2012 at 6:04 PM, lars hofhansl <[EMAIL PROTECTED]> wrote:
>> How much duplicate code are we talking about? Do these share common code to close/open the regions, or is it a completely different code path? (I know I could look myself, but it's easier to ask)
>>
>> From a gut reaction it feels cleaner to keep track of the state of the alter in ZK.
>>
>>
>
> Both are incomplete.  The approaches share no code.  The conversation
> Ted cites is from nearly a year ago (and is nought but our platitudes
> that the authors get together on the problem which didn't happen; the
> context did not help w/ one part-time on the job and the other a
> summer intern).  Neither has a sponsor.  The "Online schema update" is
> at least used in a few places, cautiously.  What should happen is we
> should pull out both and replace with a working online schema
> mechanism.  Until that happens undo at least one of them before
> someone other than J-D gets hurt.  I vote for pulling  "Online schema
> update".
>
> St.Ack