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RE: questions about LMDB
Sorry for the wrong mail list , I will forward this request to technical list
Cheers,
xinxin
-----Original Message-----
From: Howard Chu [mailto:hyc@symas.com]
Sent: Thursday, March 19, 2015 11:52 PM
To: Shu, Xinxin; openldap-devel@openldap.org
Subject: Re: questions about LMDB
Shu, Xinxin wrote:
> Several other questions about lmdb
>
> 1) does lmdb store one key-value pair in a single page? How lmdb organizes these key-value pairs in a single page
> 2) if size is larger than single page size , how lmdb process this request?
This list is for developers to discuss actual coding issues inside the OpenLDAP code; your questions are too elementary and don't belong here. Use the -technical list for user-oriented questions.
>
> Any help will be appreciated ? thanks
>
> Cheers,
> xinxin
>
> -----Original Message-----
> From: Shu, Xinxin
> Sent: Thursday, March 19, 2015 3:49 PM
> To: openldap-devel@openldap.org
> Cc: Shu, Xinxin
> Subject: questions about LMDB
>
> Hi list ,
>
> Recently I read docs about lmdb , there are two sentences
> 1) readers do not block writers
> 2) writers do not block readers
> I can understand 'readers do not block writers' , but cannot understand the second one , can someone help explain , how lmdb achieve 'writers do not block readers', below is my understandings , please correct me if anything wrong.
> if the access pattern is write - read, since lmdb only support two version of data , when the write has been started but not committed , the concurrent read may read stale data since write has not been committed.
>
> Cheers,
> xinxin
>
>
>
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/