Shouldn't it be possible for him to have empty regions if he has a TTL on his data?
-- Bryan Beaudreault On Wednesday, July 18, 2012 at 9:58 AM, Kevin O'dell wrote: > Also, depending on your version of HBase that you are running you may have > to bring down the cluster to merge and not just the table: > > https://issues.apache.org/jira/browse/HBASE-1621 > > On Tue, Jul 17, 2012 at 7:26 PM, Amandeep Khurana <[email protected] > (mailto:[email protected])> wrote: > > > You shouldn't have empty regions. Using timestamp will give you > > regions that are always half filled except the last one to which you > > are writing the current time range. The moment that'll fill up, split > > and you'll again be writing to the last region. How did you end up > > with empty regions? Did you pre-split? > > > > On Jul 17, 2012, at 7:15 PM, Michael Segel <[email protected] > > (mailto:[email protected])> > > wrote: > > > > > Find a different row key? > > > > > > The problem with merging regions is that once you merge the regions, any > > net new regions will still have the same problem. So you'll have to merge > > again, and again and again. > > > You're always filling to the left of the last key. > > > > > > In order to merge, you have to take the table offline. At least that's > > my understanding. So its not a good thing. > > > > > > > > > On Jul 17, 2012, at 11:08 AM, Ionut Ignatescu wrote: > > > > > > > My usecase: I have several tabels with key starting with a timestamp. > > Also, > > > > this tabels have set data retention to 30 days. > > > > Table size is around 1Tb(3Tb replicated) and data is inserted regular(on > > > > 5minute, ~200Mb is inserted). > > > > File size is set to 1Gb. I have this tables in use for almost half an > > > > > > > > > > > year > > > > and now a table has around 6k partitions and 40% of them are empty. > > > > The problem: the number of regions per region server is now pretty high. > > > > Questions: > > > > Which approach is better? > > > > - to merge adiacent empty partitions in a bigger one? > > > > - to merge empty partitions to non-empty partitions? > > > > Also, I'm wondering why regions merge is not part of major compactions > > > > > > > > > > > and > > > > why it's neccesary to stop the > > > > entire fleet to solve this problem. > > > > > > > > > > > > > > > > Regards, > > > > > > > > Ionut I. > > > > -- > Kevin O'Dell > Customer Operations Engineer, Cloudera > >
