Sorry for the wrong mail list , I will forward this request to technical list
Cheers, xinxin -----Original Message----- From: Howard Chu [mailto:h...@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/
