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From Ted Yu <yuzhih...@gmail.com>
Subject Re: Silly question... Coprocessor writes to ZK?
Date Fri, 05 Sep 2014 01:29:37 GMT
This reminds me of
HBASE-7958 Statistics per-column family per-region

Cheers


On Thu, Sep 4, 2014 at 6:23 PM, Mikhail Antonov <olorinbant@gmail.com>
wrote:

> I think ZK isn't the best possible storage for statistics. A separate stats
> table may be better solution.
>
> -Mikhail
>
>
> 2014-09-04 15:48 GMT-07:00 Michael Segel <michael_segel@hotmail.com>:
>
> > So suppose I want to capture metadata about a table across all of the
> > regions for that table.
> >
> > Has anyone used a coprocessor to capture a region’s statistics and push
> > them up to ZK where its stored by (table, region, <metadata object>) and
> > then a table wide value is also stored based on a computational update?
> >
> > So if I wanted to store the row counts for each region of a table,  each
> > region would update its record in ZK on each insert / delete (can you
> > easily remove a tombstone?) and then update the computational value?
> > (Assuming you could lock those values for a short enough time to do the
> > quick computation. If not, then it can be computed on the fly)
> >
> > Has this been done?
> >
> > Thoughts?
> >
> >
>
>
> --
> Thanks,
> Michael Antonov
>

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