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From Jeremy Carroll <phobos...@gmail.com>
Subject Re: Column Family level bloom filters
Date Tue, 06 Nov 2012 14:12:57 GMT
There is a great blog post regarding HFile formats, and what they contain
here.

http://blog.cloudera.com/blog/2012/06/hbase-io-hfile-input-output/

On Mon, Nov 5, 2012 at 8:57 PM, Anoop Sam John <anoopsj@huawei.com> wrote:

> >about column family level bloom filters
> You mean column blooms right? [Bloom on rowkey & cf+qualifier]
> >Are these filters in memory or are they just persisted as part of the
> HFile or both
> All blooms will get persisted while writing the HFile. When the HFile is
> opened for read the bloom info will be read and will be available in memory.
> Only difference is what data is getting added to blooms.
>
> -Anoop-
> ________________________________________
> From: Varun Sharma [varun@pinterest.com]
> Sent: Tuesday, November 06, 2012 7:11 AM
> To: user@hbase.apache.org
> Subject: Column Family level bloom filters
>
> Hi,
>
> I had a question about column family level bloom filters. Are these filters
> in memory or are they just persisted as part of the HFile or both ? For
> in-memory bloom filters, deletes could incur a high cost of rebuilding the
> bloom filter.
>
> Thanks
> VArun
>

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