hbase-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Shahab Yunus <shahab.yu...@gmail.com>
Subject Re: Region balancing query
Date Fri, 13 Feb 2015 22:03:26 GMT
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
> > > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message