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 > > >
