hbase-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Lars George <lars.geo...@gmail.com>
Subject Re: Canary Test Tool and write sniffing
Date Sat, 04 Feb 2017 12:06:03 GMT
Also, the default interval used to be 60 secs, but is now 6 secs. Does
that make sense? Seems awfully short for a default, assuming you have
many regions or servers.

On Sat, Feb 4, 2017 at 11:54 AM, Lars George <lars.george@gmail.com> wrote:
> Hi,
>
> Looking at the Canary tool, it tries to ensure that all canary test
> table regions are spread across all region servers. If that is not the
> case, it calls:
>
> if (numberOfCoveredServers < numberOfServers) {
>   admin.balancer();
> }
>
> I doubt this will help with the StochasticLoadBalancer, which is known
> to consider per-table balancing as one of many factors. In practice,
> the SLB will most likely _not_ distribute the canary regions
> sufficiently, leaving gap in the check. Switching on the per-table
> option is discouraged against to let it do its thing.
>
> Just pointing it out for vetting.
>
> Lars

Mime
View raw message