Great, thanks. I just wanted to confirm my understanding that 0.98 is indeed OK.
Regards, Shahab On Thu, Aug 28, 2014 at 2:35 PM, Jean-Marc Spaggiari < jean-m...@spaggiari.org> wrote: > Hi Shahab, > > Ted talked about 0.94. In 0.98 there is no (known) issues with the on-line > merge. > > JM > > > 2014-08-28 14:33 GMT-04:00 Shahab Yunus <shahab.yu...@gmail.com>: > > > I have a question here. In 0.98 the merge_region command which can be run > > through HBase shell is not reliable? If we simply want to merge 2 regions > > at a time? I thought that the older Merge tool was not safe. > > > > Thanks, > > Shahab > > > > > > On Thu, Aug 28, 2014 at 2:26 PM, Bryan Beaudreault < > > bbeaudrea...@hubspot.com > > > wrote: > > > > > I've done it. This is the code I used: > > > https://gist.github.com/bbeaudreault/7567385 > > > > > > It comes from the hbase source, but is modified to actually work (the > > class > > > provided in hbase is private and does not work out of the box). There > is > > a > > > readme at the bottom of the gist with my process. One important note > > > though, I did this with a deep understanding (after hours of reading > > hbase > > > code and doing tests on a test cluster) of how it all works. And even > > then > > > I felt nervous to do it in prod. Hence why I went the snapshot/compact > > > route. > > > > > > I would definitely test it on a test cluster and get some familiarity > > > before getting close to a production table. That said, I've run this > on > > > 8-10 production tables a few months ago, reducing in size from 10-20x > in > > > some cases. > > > > > > > > > On Thu, Aug 28, 2014 at 2:19 PM, Ted Tuttle <t...@mentacapital.com> > > wrote: > > > > > > > Hello- > > > > > > > > We recently realized our region size is 1G and need to increase it to > > get > > > > our region count under control. I've done some research on merging > > > regions > > > > and have come away confused. > > > > > > > > There is the ops handbook: > > > > > > > > http://hbase.apache.org/book/ops.regionmgt.html > > > > > > > > And then there is this horror story: > > > > > > > > http://metabroadcast.com/blog/so-you-broke-hbase > > > > > > > > Is there someone out there that has done a large scale (i.e. 10:1 > > > > reduction on 10k's of regions) merge successfully on HBase 0.94? If > > so, > > > > how did you do it? > > > > > > > > Thanks, > > > > Ted > > > > > > > > > > > > > >
