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From Stack <st...@duboce.net>
Subject Re: Can region be merged with others automatically when all data in the region has expired and removed ?
Date Thu, 10 Feb 2011 05:15:20 GMT
Sure.  You need to make an account in the Apache issue tracking system
called JIRA.  All Apache projects are hosted on the one issue tracking
system.  The HBase area is here:
https://issues.apache.org/jira/browse/HBASE  Click the 'login' button
in the top right hand corner to create an account for yourself.  Once
you've done that, you should be able to create an HBase issue.  See
the 'Create' button near the top right in the hbase area of JIRA.
Fill out the form and submit.

Let me know if you need more pointers,

2011/2/9 Zhou Shuaifeng <zhoushuaifeng@huawei.com>:
> Hi,
> Thanks,
> My hbase version is 0.90, we have enabled gzip compaction.
> What do you mean by "making an issue"?  I really would like to, but I'm
> newer to hbase dev. previously, I send mail to user group, but find this
> should be an dev issue.
> If this is really one thing should be done, can you help?
> Zhou Shuaifeng(Frank)
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> -----邮件原件-----
> 发件人: saint.ack@gmail.com [mailto:saint.ack@gmail.com] 代表 Stack
> 发送时间: 2011年2月10日 2:13
> 收件人: dev@hbase.apache.org
> 抄送: yanlijun@huawei.com
> 主题: Re: 答复: Can region be merged with others automatically when all data
> in the region has expired and removed ?
> On Wed, Feb 9, 2011 at 12:59 AM, Zhou Shuaifeng
> <zhoushuaifeng@huawei.com> wrote:
>> We have test a cluster which have more than 30,000 regions, max size of a
> region is 512MB. At this situation, data no more growing, but remove some
> old data and insert new, and regions will be more and more.
>> This occupies too much heapsize, and will be more if regions cannot be
> merged. And it takes too long to make the table offline.
> I've seen this before where the region size chosen at the start turns
> out to be inappropriate -- or the initial config. was missing LZO --
> and then at the end of the loading, or during, an adjustment needs to
> be made to keep an upper bound on region count.
> For example, in Zhou's case above, it sounds like the regions could
> have been bigger.
> With 30k regions, we can't do manual merges.  A script that does a
> survey to pick out adjacent small regions that then does the online
> merge up seems like it would be useful.
> We also need the ability to do online edits of schema setting region
> size and compression without having to take down the table.
> Would you mind making an issue Zhou?   It'd be of type umbrella since
> there is already effort to do features such as online schema edits.
> Thanks,
> St.Ack
> P.S. What version of hbase Zhou?  Did you have compression enabled?

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