Yes, it does, until compactions happen. J-D
On Fri, Oct 8, 2010 at 3:39 PM, yuliya Feldman <[email protected]> wrote: > I understand that data will be fetched via network, my concern is that instead > of assigning local regions to regionserver it assigns remote ones which means > that all data access will be remote > > > > ----- Original Message ---- > From: Jean-Daniel Cryans <[email protected]> > To: [email protected] > Sent: Fri, October 8, 2010 3:28:15 PM > Subject: Re: Question regarding regions move/assignement > > Even with rep=1, HDFS appears like one single filesystem to HBase so > the blocks that are remote to the region server will be fetched via > network. > > J-D > > On Fri, Oct 8, 2010 at 3:25 PM, yuliya Feldman <[email protected]> wrote: >> Thanks for the link. It is very helpful. >> >> My concerns was that after HBase restart (table "dissapears" means - looks > like >> some data got corrupted and HBase stopped showing my table in the list of >> Tables) some regions that were originally created on one region server got >> reassigned to different regionserver after restart, although physically data >> still on data node of first region server. >> >> My replication was 1, so data belongs to just a single data node. >> >> Thanks >> >> >> >> ----- Original Message ---- >> From: Jean-Daniel Cryans <[email protected]> >> To: [email protected] >> Sent: Fri, October 8, 2010 2:49:18 PM >> Subject: Re: Question regarding regions move/assignement >> >> Not sure about the part where your table "disappears", but your >> question is mostly answered in this blog post by our good friend Lars >> G. http://www.larsgeorge.com/2010/05/hbase-file-locality-in-hdfs.html >> >> J-D >> >> On Thu, Oct 7, 2010 at 6:41 PM, yuliya Feldman <[email protected]> wrote: >>> Hello here, >>> >>> I have a question regarding HBase data locality in respect to HDFS data > nodes. >>> As far as I understand regions created by region servers will happen to be >>> physically created on local Data Node if RegionServer happen to run on one. >>> >>> I had an issue with writing to Meta table and my table "dissapeared" from > list >>> of tables. After I restarted hbase everything went back to normal, but > regions >>> got reassigned to different region servers they were originally created. >>> >>> How this "(re)assignment" mechanism actually works? >>> >>> I am using hbase 0.20.4 at the moment. >>> >>> Thanks >>> >>> >>> >>> >>> >> >> >> >> >> > > > > >
