0.90.0 wasn't released yet, the current stable version is 0.20.6 For more information on HBase versions, see http://wiki.apache.org/hadoop/Hbase/HBaseVersions
J-D On Wed, Oct 6, 2010 at 2:36 PM, William Kang <[email protected]> wrote: > By the way, where can I get a stable version of 0.90? Thanks. > > > Cao > > On Wed, Oct 6, 2010 at 12:54 PM, Jean-Daniel Cryans > <[email protected]>wrote: > >> Like Stack said, it's available in 0.90 which we're currently wrapping >> up (so not in 0.20.x). >> >> Distributing regions and distributing blocks is orthogonal (ish, but >> for this discussion let's not mix the two together), the former being >> assumed by the HBase master and the latter being assumed by the >> Namenode. Maybe this blog post can help you understanding how HBase >> uses HDFS >> http://www.larsgeorge.com/2009/10/hbase-architecture-101-storage.html >> >> J-D >> >> On Tue, Oct 5, 2010 at 8:38 PM, William Kang <[email protected]> >> wrote: >> > So, I can use the 'move' command to manually balance the load? Is this >> > available to 0.20.6? Was there any automatic balance mechanism in hbase >> > before if the replicated block is not for load distribution purpose? >> Thanks. >> > >> > >> > William >> > >> > On Tue, Oct 5, 2010 at 11:19 PM, Stack <[email protected]> wrote: >> > >> >> In 0.90, you can turn off the balancer and then distribute the regions >> >> any way you wish with new 'move' command. >> >> St.Ack >> >> >> >> On Tue, Oct 5, 2010 at 8:13 PM, Jean-Daniel Cryans <[email protected] >> > >> >> wrote: >> >> > A row is always served a single region, so the question is more about >> >> > region distribution. In 0.20 and 0.89 you have no control over that >> >> > (the best you can do is calling close_region in the shell, where is >> >> > the region will be moved is "random"), but things are getting better >> >> > in 0.90 where you'll be able to move regions manually. >> >> > >> >> > HBase doesn't create multiple copies of HFiles to distribute load, >> >> > what happens is each block is replicated 3 times by HDFS and this is >> >> > invisible to HBase. This is done for data safety rather than >> >> > distributing the load. >> >> > >> >> > J-D >> >> > >> >> > On Tue, Oct 5, 2010 at 8:05 PM, William Kang <[email protected]> >> >> wrote: >> >> >> Hi folks, >> >> >> I have a general question about Hbase. Can we pick which region >> server >> >> we >> >> >> want to save a particular row? The reason I am asking this is because >> >> >> sometimes we want to manually balance region servers' load. If we >> could >> >> >> assign particular rows to particular region servers, we can have that >> >> >> control. I understand that Hbase will balance its load automatically >> by >> >> >> create multiple copies of hfiles in HDFS. But, we do want to have >> more >> >> >> control over that. Is it possible or is it already in Hbase but we >> >> didn't >> >> >> find it? Many thanks. >> >> >> >> >> >> >> >> >> William >> >> >> >> >> > >> >> >> > >> >
