What was the output from 'balancer' command ? Was is possible that balancer was disabled ?
Cheers On Mon, Feb 16, 2015 at 8:04 AM, Abe Weinograd <a...@flonet.com> wrote: > Ok. I forced the balancer run and am not seeing anything after a few > minutes. Master logs isn't showing anything. Should I look at the RS ones > instead? > > On Mon, Feb 16, 2015 at 11:03 AM, Ted Yu <yuzhih...@gmail.com> wrote: > > > You should see effect in the next balancer run. > > > > Cheers > > > > On Mon, Feb 16, 2015 at 7:52 AM, Abe Weinograd <a...@flonet.com> wrote: > > > > > Excellent. If i trigger the balancer, should this start to help or only > > for > > > future region creation? > > > > > > Thanks, > > > Abe > > > > > > On Mon, Feb 16, 2015 at 9:35 AM, Ted Yu <yuzhih...@gmail.com> wrote: > > > > > > > Yes. This setting should be modified on Master. > > > > > > > > Cheers > > > > > > > > On Mon, Feb 16, 2015 at 6:27 AM, Abe Weinograd <a...@flonet.com> > wrote: > > > > > > > > > Thanks Ted. We are putting this in the hbase-site.xml for the > > Master? > > > > > > > > > > Abe > > > > > > > > > > On Fri, Feb 13, 2015 at 5:03 PM, Shahab Yunus < > > shahab.yu...@gmail.com> > > > > > wrote: > > > > > > > > > > > Thanks, we will try that and report back. > > > > > > > > > > > > Regards, > > > > > > Shahab > > > > > > > > > > > > On Fri, Feb 13, 2015 at 4:56 PM, Ted Yu <yuzhih...@gmail.com> > > wrote: > > > > > > > > > > > > > You can make TableSkewCostFunction more prominent by increasing > > the > > > > > value > > > > > > > for config parameter: > > > > > > > > > > > > > > hbase.master.balancer.stochastic.tableSkewCost > > > > > > > > > > > > > > Its default is 35. > > > > > > > > > > > > > > See if raising to 100 or 200 helps. > > > > > > > > > > > > > > On Fri, Feb 13, 2015 at 1:09 PM, Shahab Yunus < > > > > shahab.yu...@gmail.com> > > > > > > > wrote: > > > > > > > > > > > > > > > Yes, this sever hosts other regions from other tables as > well. > > > > > > > > > > > > > > > > Regards > > > > > > > > Shahab > > > > > > > > > > > > > > > > On Fri, Feb 13, 2015 at 1:45 PM, Ted Yu <yuzhih...@gmail.com > > > > > > wrote: > > > > > > > > > > > > > > > > > Interesting, server7.ec3.internal,60020,1423845018628 was > > > > > > consistently > > > > > > > > > chosen as destination for the table. > > > > > > > > > Did server7.ec3.internal,60020,1423845018628 host regions > > from > > > > > other > > > > > > > > table > > > > > > > > > ? > > > > > > > > > > > > > > > > > > Cheers > > > > > > > > > > > > > > > > > > On Fri, Feb 13, 2015 at 10:27 AM, Shahab Yunus < > > > > > > shahab.yu...@gmail.com > > > > > > > > > > > > > > > > > wrote: > > > > > > > > > > > > > > > > > > > Table name is: > > > > > > > > > > MYTABLE_RECENT_4W_V2 > > > > > > > > > > > > > > > > > > > > Pastebin snippet 1: http://pastebin.com/dQzMhGyP > > > > > > > > > > Pastebin snippet 2: http://pastebin.com/Y7ZsNAgF > > > > > > > > > > > > > > > > > > > > This is the master log after invoking balancer command > from > > > > hbase > > > > > > > > shell. > > > > > > > > > > > > > > > > > > > > Regards, > > > > > > > > > > Shahab > > > > > > > > > > > > > > > > > > > > On Fri, Feb 13, 2015 at 12:00 PM, Ted Yu < > > > yuzhih...@gmail.com> > > > > > > > wrote: > > > > > > > > > > > > > > > > > > > > > bq. all the regions of this table were back on this > same > > > RS! > > > > > > > > > > > > > > > > > > > > > > Interesting. Please check master log around the time > this > > > RS > > > > > was > > > > > > > > > brought > > > > > > > > > > > online. You can pastebin the relevant snippet. > > > > > > > > > > > > > > > > > > > > > > Thanks > > > > > > > > > > > > > > > > > > > > > > On Fri, Feb 13, 2015 at 8:55 AM, Shahab Yunus < > > > > > > > > shahab.yu...@gmail.com> > > > > > > > > > > > wrote: > > > > > > > > > > > > > > > > > > > > > > > Hi Ted. > > > > > > > > > > > > > > > > > > > > > > > > Yes, the cluster itself is balanced. On average 300 > > > regions > > > > > per > > > > > > > > node > > > > > > > > > on > > > > > > > > > > > 10 > > > > > > > > > > > > nodes. > > > > > > > > > > > > > > > > > > > > > > > > # of tables is 53 of varying sizes. > > > > > > > > > > > > > > > > > > > > > > > > Balancer was invoked and it didn't do anything (i.e. > no > > > > > > movement > > > > > > > of > > > > > > > > > > > > regions) but we didn't check the master's logs. We > can > > do > > > > > that. > > > > > > > > > > > > > > > > > > > > > > > > Interestingly, we restarted the RS which was holding > > all > > > > the > > > > > > > > regions > > > > > > > > > of > > > > > > > > > > > > this one table. The regions were nicely spread out to > > the > > > > > > > remaining > > > > > > > > > RS. > > > > > > > > > > > But > > > > > > > > > > > > when we brought back this RS, all the regions of this > > > table > > > > > > were > > > > > > > > back > > > > > > > > > > on > > > > > > > > > > > > this same RS! > > > > > > > > > > > > > > > > > > > > > > > > Thanks. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Regards, > > > > > > > > > > > > Shahab > > > > > > > > > > > > > > > > > > > > > > > > On Fri, Feb 13, 2015 at 11:46 AM, Ted Yu < > > > > > yuzhih...@gmail.com> > > > > > > > > > wrote: > > > > > > > > > > > > > > > > > > > > > > > > > How many tables are there in your cluster ? > > > > > > > > > > > > > > > > > > > > > > > > > > Is the cluster balanced overall (in terms of number > > of > > > > > > regions > > > > > > > > per > > > > > > > > > > > > server) > > > > > > > > > > > > > but this table is not ? > > > > > > > > > > > > > > > > > > > > > > > > > > What happens (check master log) when you issue > > > 'balancer' > > > > > > > command > > > > > > > > > > > through > > > > > > > > > > > > > shell ? > > > > > > > > > > > > > > > > > > > > > > > > > > Cheers > > > > > > > > > > > > > > > > > > > > > > > > > > On Fri, Feb 13, 2015 at 8:19 AM, Shahab Yunus < > > > > > > > > > > shahab.yu...@gmail.com> > > > > > > > > > > > > > wrote: > > > > > > > > > > > > > > > > > > > > > > > > > > > CDH 5.3 > > > > > > > > > > > > > > HBase 98.6 > > > > > > > > > > > > > > > > > > > > > > > > > > > > We are writing data to an HBase table through a > M/R > > > > job. > > > > > We > > > > > > > pre > > > > > > > > > > split > > > > > > > > > > > > the > > > > > > > > > > > > > > table before each job run. The problem is that > most > > > of > > > > > the > > > > > > > > > regions > > > > > > > > > > > end > > > > > > > > > > > > up > > > > > > > > > > > > > > on the same RS. This results in that one RS being > > > > > severely > > > > > > > > > > overloaded > > > > > > > > > > > > and > > > > > > > > > > > > > > subsequent M/R jobs failing trying to write to > the > > > > > regions > > > > > > on > > > > > > > > > that > > > > > > > > > > > RS. > > > > > > > > > > > > > > > > > > > > > > > > > > > > The balancer is on and the split policy is > default. > > > No > > > > > > > changes > > > > > > > > > > there. > > > > > > > > > > > > It > > > > > > > > > > > > > is > > > > > > > > > > > > > > a 10 node cluster. > > > > > > > > > > > > > > > > > > > > > > > > > > > > All other related properties are defaults too. > > > > > > > > > > > > > > > > > > > > > > > > > > > > Any idea, how can we force balancing of the new > > > > regions? > > > > > Do > > > > > > > we > > > > > > > > > have > > > > > > > > > > > to > > > > > > > > > > > > > > consider compaction into the equation as well? > > > Thanks. > > > > > > > > > > > > > > > > > > > > > > > > > > > > Regards, > > > > > > > > > > > > > > Shahab > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
