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From yonghu <yongyong...@gmail.com>
Subject Re: hbase memstore size
Date Wed, 06 Aug 2014 14:54:28 GMT
I did not quite understand your problem. You store your data in HBase, and
I guess later you also will read data from it. Generally, HBase will first
check if the data exist in memstore, if not, it will check the disk. If you
set the memstore to 0, it denotes every read will directly forward to disk.
How heavy will be the I/O cost? Moreover, you can think memstore as a
buffer management in RDBMS.


On Tue, Aug 5, 2014 at 5:54 AM, Alex Newman <posix4e@gmail.com> wrote:

> Could you explain a bit more of why you don't want a memstore? I can't see
> why it is harmful. Sorry to be dense.
> On Aug 3, 2014 11:24 AM, "Ozhan Gulen" <ozhangulen@gmail.com> wrote:
>
> > Hello,
> > In our hbase cluster memstore flush size is 128 mb. And to insert data to
> > tables, we only use bulk load tool. Since bulk loading bypasses
> memstores,
> > they are never used, so we want to minimize memstore flush size. But
> > memstore flush size is used in many important calculations in hbase such
> > that;
> >
> > region split size = Min (R^2 * “hbase.hregion.memstore.flush.size”,
> > “hbase.hregion.max.filesize”)
> >
> > So setting memstore value smaller or "0" for example,  results in some
> > other problems.
> > What do you suggest us in that case. Setting memstore size to 128 holds
> > some memory for tens of regions in region server and we want to get rid
> of
> > it.
> > Thanks a lot.
> >
> > ozhan
> >
>

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