Draining mode and graceful decommissioning

[Lars George <la...@gmail.com>]

Hi,

This is along the lines of https://issues.apache.org/jira/browse/HBASE-10367

Since we have draining mode, should we not in the meantime at least
replace the balancer stop/start step in graceful_stop.sh with simply
setting the draining mode for the server? This would less impact any
other balancer work.

BTW, I tried on 1.3 to figure the state of the balancer handling the
draining mode flag for a node, and it seems to do the right thing (see
https://www.evernote.com/l/ACHWQmzwekZN9LIVcInLjviefhwngwuhqJE) - are
there any concerns that it does not? Enis (and Stack in the original
JIRA) mentioned something about it only being implemented in one part,
but not the other?

Cheers,
Lars

Re: Draining mode and graceful decommissioning

[Jerry He <je...@gmail.com>]

Please see https://issues.apache.org/jira/browse/HBASE-16010 as well.
Nice testing you did.  zk_dump not dumping draining nodes is probably a
small bug.
Yes, we need to update/improve the related scripts.

Thanks.

Jerry

On Sun, Jan 1, 2017 at 6:56 AM, Lars George <la...@gmail.com> wrote:

> Hi,
>
> This is along the lines of https://issues.apache.org/
> jira/browse/HBASE-10367
>
> Since we have draining mode, should we not in the meantime at least
> replace the balancer stop/start step in graceful_stop.sh with simply
> setting the draining mode for the server? This would less impact any
> other balancer work.
>
> BTW, I tried on 1.3 to figure the state of the balancer handling the
> draining mode flag for a node, and it seems to do the right thing (see
> https://www.evernote.com/l/ACHWQmzwekZN9LIVcInLjviefhwngwuhqJE) - are
> there any concerns that it does not? Enis (and Stack in the original
> JIRA) mentioned something about it only being implemented in one part,
> but not the other?
>
> Cheers,
> Lars
>