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Posted to user@hbase.apache.org by Zhou Shuaifeng <zh...@huawei.com> on 2010/06/29 11:40:13 UTC
Questions about bloomfilter in hbase
Hi,
I looked into the source code of hbase, find that the default value of using
bloomfilter is all false.
In the HColumnDescriptor, there is name and default value of bloomfilter.
But I can't find any function to deal with the bloomfilter when the onoff of
bloombilter is TRUE.
So, what operation does hbase do when the bloomfilter onoff is setting to
True? How to set it if bloomfilter is needed when add column or alter table?
And how to configer the bloomfilter ? (like vector size, nmhash, etc..)
Thanks.
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RE: Questions about bloomfilter in hbase
Posted by Zhou Shuaifeng <zh...@huawei.com>.
OK, I will get it and study more.
Thanks a lot.
Zhou Shuaifeng(Frank)
-----Original Message-----
From: Stack [mailto:saint.ack@gmail.com]
Sent: Tuesday, June 29, 2010 11:03 PM
To: user@hbase.apache.org
Subject: Re: Questions about bloomfilter in hbase
No bloomfilters in 0.20.x hbase. They were removed a while ago because
poorly implemented. It looks like we did not excise it from everywhere.
Bloomfilters will make a comeback in hbase 0.90.0. They have been
completely redone and are super fancy. Check them out in the recent
developer release drop, 0.89.20100625
Stack
On Jun 29, 2010, at 2:40 AM, Zhou Shuaifeng <zh...@huawei.com>
wrote:
> Hi,
>
> I looked into the source code of hbase, find that the default value of
> using bloomfilter is all false.
> In the HColumnDescriptor, there is name and default value of bloomfilter.
> But I can't find any function to deal with the bloomfilter when the
> onoff of bloombilter is TRUE.
>
> So, what operation does hbase do when the bloomfilter onoff is setting
> to True? How to set it if bloomfilter is needed when add column or alter
table?
> And how to configer the bloomfilter ? (like vector size, nmhash,
> etc..)
>
> Thanks.
>
>
>
> ----------------------------------------------------------------------
> ------
> ---------------------------------------------------------
> This e-mail and its attachments contain confidential information from
> HUAWEI, which is intended only for the person or entity whose address
> is listed above. Any use of the information contained herein in any
> way (including, but not limited to, total or partial disclosure,
> reproduction, or dissemination) by persons other than the intended
> recipient(s) is prohibited. If you receive this e-mail in error,
> please notify the sender by phone or email immediately and delete it!
>
>
Re: Questions about bloomfilter in hbase
Posted by Stack <sa...@gmail.com>.
No bloomfilters in 0.20.x hbase. They were removed a while ago because poorly implemented. It looks like we did not excise it from everywhere.
Bloomfilters will make a comeback in hbase 0.90.0. They have been completely redone and are super fancy. Check them out in the recent developer release drop, 0.89.20100625
Stack
On Jun 29, 2010, at 2:40 AM, Zhou Shuaifeng <zh...@huawei.com> wrote:
> Hi,
>
> I looked into the source code of hbase, find that the default value of using
> bloomfilter is all false.
> In the HColumnDescriptor, there is name and default value of bloomfilter.
> But I can't find any function to deal with the bloomfilter when the onoff of
> bloombilter is TRUE.
>
> So, what operation does hbase do when the bloomfilter onoff is setting to
> True? How to set it if bloomfilter is needed when add column or alter table?
> And how to configer the bloomfilter ? (like vector size, nmhash, etc..)
>
> Thanks.
>
>
>
> ----------------------------------------------------------------------------
> ---------------------------------------------------------
> This e-mail and its attachments contain confidential information from
> HUAWEI, which
> is intended only for the person or entity whose address is listed above. Any
> use of the
> information contained herein in any way (including, but not limited to,
> total or partial
> disclosure, reproduction, or dissemination) by persons other than the
> intended
> recipient(s) is prohibited. If you receive this e-mail in error, please
> notify the sender by
> phone or email immediately and delete it!
>
>