accumulo-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Christopher <ctubb...@apache.org>
Subject Re: Offline tables on adding a tserver (Accumulo 1.6 regression?)
Date Sat, 10 Jan 2015 22:34:49 GMT
Minutes at a time is a lot of time. I think Eric Newton was looking at some
performance issues with assignments. This could be related to that.


--
Christopher L Tubbs II
http://gravatar.com/ctubbsii

On Sat, Jan 10, 2015 at 4:42 PM, Denis <denis@camfex.cz> wrote:

> 1. client requests are timed out. also http://monitor/tables shows
> number of offline tablets for each table.
> 2. few minutes (up to 10)
> 3. about 6000
> 4. yes
> 5. I do not remember the problem with accumulo 1.4.
>
> On 1/10/15, Christopher <ctubbsii@apache.org> wrote:
> > Adding a new tserver creates an imbalanced situation, where tablets are
> not
> > spread evenly across tablet servers. The tablet balancer in the master
> > server occasionally rebalances tablets. During the short period of time
> > those tablets are migrating, they will be temporarily offline. That
> should
> > have always been the case and would be perfectly normal.
> >
> > I'm curious:
> > 1) how did you detect these were offline?
> > 2) how long were they offline?
> > 3) how many tablets do you have per server?
> > 4) are you using the default balancers?
> > 5) in what sense do you mean "regression"? are you thinking this is
> linked
> > to a previous bug/issue?
> >
> >
> >
> > --
> > Christopher L Tubbs II
> > http://gravatar.com/ctubbsii
> >
> > On Sat, Jan 10, 2015 at 10:31 AM, Denis <denis@camfex.cz> wrote:
> >
> >> Hi
> >>
> >> I recently upgraded my Accumulo cluster from 1.4 to 1.6 and noticed a
> >> regression.
> >>
> >> Removing a tserver makes puts some tablets offline for a while until
> >> other tservers start handling them, that's normal.
> >>
> >> But with 1.6 the same happens on adding a tserver as well.
> >> Is it ok?
> >>
> >
>

Mime
View raw message