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From Josh Elser <josh.el...@gmail.com>
Subject Re: Offline tables on adding a tserver (Accumulo 1.6 regression?)
Date Sun, 11 Jan 2015 03:28:52 GMT
Denis, could you please open an issue on JIRA with any specifics that 
you have? That would help us make sure that it doesn't get lost 
(especially since we were considering releasing a 1.6.2 soon). Thanks 
for asking, too.

Christopher wrote:
> 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
> <mailto: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
>     <mailto: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
>     <mailto: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?
>      >>
>      >
>
>

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