This is my fault. I'm moderator on the list. Some stuff goes to moderator first and I'm not fast enough clearing them. Sorry about that J-D and Himanshu. St.Ack
On Wed, Sep 1, 2010 at 1:07 PM, Himanshu Vashishtha <vashishth...@gmail.com> wrote: > yeah! it got posted twice, unintentionally. Thanks for the answer, J-D. > > On Wed, Sep 1, 2010 at 2:04 PM, Jean-Daniel Cryans <jdcry...@apache.org>wrote: > >> Like I answered this morning to the same question: >> >> StoreFile is just a wrapper for HFile to add HBase-sugar on top of it. >> >> J-D >> >> On Wed, Sep 1, 2010 at 7:59 AM, Himanshu Vashishtha >> <hvash...@cs.ualberta.ca> wrote: >> > It will be great if anyone can point out the difference in their >> > functionality. What I understand is Storefile is made persistent in fs, >> > compactions occurred on these (to me, its an equivalent of SSTable). >> > Hfile is derived (evolved) from MapFile, giving access to faster random >> > reads (as it uses index to look for a key etc). Is it a handler sort of >> to >> > access the persisted Storefile? By their package structure, i think so >> > (Hfile is in io, storefile is in rs). >> > >> > Now, the interesting thing is I know I am possibly wrong. As Ryan pointed >> > out recently:"Hfiles are write once read many. Once written they cannot >> be >> > modified so there is way to move things around."... >> > This is a SSTable property: they are immutable. And they are merged into >> one >> > by compactions (major). >> > >> > I will appreciate if you can provide the missing link. >> > >> > Thanks, >> > ~Himanshu >> > >> >
