-1 B. Regards, Edward yoon.
> Date: Mon, 7 Jan 2008 20:49:29 -0800 > From: [EMAIL PROTECTED] > Subject: [hbase] table HRegionServer affinity > To: hadoop-dev@lucene.apache.org > > Hello, > > Consider the case of a global federation of Hadoop > clusters, with a single global HBase master, divided into a > number of geographic regions each with a local DFS, local > workload, and region server backed by that DFS. This setup > allows for a global HBase space, where any region may > retrieve rows stored by any other region -- which is quite > useful -- but, in addition to this, it would also be useful > to be able to specify constraints on data mobility and also > to be able to scope queries to a particular region. > > To be a bit more specific, I have three things in mind: > > 1) The ability to fix a given key range to a region. This > would both assign a range to a given region, and also > disable splitting over that range. Aside from API changes, > ideally there would be a HBase shell command to support > this. > > 2) Syntactic support in HBase shell for table affinity to a > given region server: > > CREATE TABLE ... REGION=10.10.10.10 > > (or similar) This would fix an entire table to a region. > > 3) Query support for scoping the result set based on region > server: > > SELECT ... WHERE @REGION=10.10.10.10 AND ... > > (or similar) > > Given the inflexibility of IP or hostnames to name regions, > perhaps a mechanism for assigning logical labels to a > region server (or even group of region servers, where a > prohibition on splitting may be relaxed to allow splitting > over the group) would also be useful. > > As I am still coming up to speed on Hadoop and HBase and > the code base, I kindly ask for the answers to two > questions. > > First: How invasive to the HBase master/region model is the > concept of specifying constraints on data mobility? > > Second: How difficult would the modifications may be to > accomplish? > > I believe these questions to be related. :-) > > Thanks, > > Andrew Purtell > Advanced Threats Research > Trend Micro, Inc., Pasadena, CA, USA > (personal mail) > > > > ____________________________________________________________________________________ > Looking for last minute shopping deals? > Find them fast with Yahoo! Search. > http://tools.search.yahoo.com/newsearch/category.php?category=shopping _________________________________________________________________ Get the power of Windows + Web with the new Windows Live. http://www.windowslive.com?ocid=TXT_TAGHM_Wave2_powerofwindows_012008
