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From Abe Weinograd <...@flonet.com>
Subject Re: Region balancing query
Date Mon, 16 Feb 2015 15:52:40 GMT
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 <yuzhihong@gmail.com> wrote:

> Yes. This setting should be modified on Master.
>
> Cheers
>
> On Mon, Feb 16, 2015 at 6:27 AM, Abe Weinograd <abe@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.yunus@gmail.com>
> > wrote:
> >
> > > Thanks, we will try that and report back.
> > >
> > > Regards,
> > > Shahab
> > >
> > > On Fri, Feb 13, 2015 at 4:56 PM, Ted Yu <yuzhihong@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.yunus@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 <yuzhihong@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.yunus@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 <yuzhihong@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.yunus@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 <
> > yuzhihong@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.yunus@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
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>

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