Please include dev@ so that other people would be able to answer your question. >> and Daugter A2(Midkey to startkey). Should read (Midkey to endkey).
For #1 below, you're right that splitting benefits retrieval more than writes. For #2, I guess you may have read CompactSplitThread code where compacting stores in a region happens before splitting. Cheers On Mon, Jul 4, 2011 at 9:26 PM, Ramkrishna S Vasudevan < [email protected]> wrote: > Dear Ted > > Thanks for your reply. > > I have few questions on Splitting of regions. > > I will tell my observations, may be they are not fully correct. Pls correct > me if am wrong, > > Every time compaction results in a file greater than max file size region > splits happen from the mid key. > > So Region A is now split into Daughter A1(Start to midkey) and Daugter > A2(Midkey to startkey). > > 1. Why do we do a split ? > I suppose it is because now a Region will now hold only a portion of the > full data and hence retrieval will be easy. > > 2. Is there a possibility that during first compaction a region split > happens, which results in 2 region creations. > > Now when new write request come to the parent region will it be accomodated > in the new daughter regions that were created. > If it is the case, now how will the splitkeys be handled ? > > Pls do corect me if am wrong anywhere? > > Regards > Ram > > > > > **************************************************************************** > *********** > This e-mail and 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! > > -----Original Message----- > From: Ted Yu [mailto:[email protected]] > Sent: Tuesday, July 05, 2011 9:38 AM > To: [email protected] > Cc: [email protected] > Subject: Re: Reg: The HLog that is created in region creation > > Not really used. > See hbase-4010 > > > > On Jul 4, 2011, at 8:55 PM, Ramkrishna S Vasudevan < > [email protected]> > wrote: > > > Hello > > > > > > > > Can anybody tell me what is the use of the HLog created per region when a > > region is created? > > > > > > > > Regards > > > > Ram > > > > > > > > > > **************************************************************************** > > *********** > > This e-mail and 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! > > > > > > > >
