hbase-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Ryan Rawson <ryano...@gmail.com>
Subject Re: Are there any single points of failure in a HBase configuration
Date Tue, 16 Jun 2009 21:27:39 GMT
i havent heard of it, but it would be nice :-)



On Tue, Jun 16, 2009 at 2:21 PM, Ski Gh3 <skigh3@gmail.com> wrote:

> I thought HDFS will fix the namenode as a SPOF just as HBase fix the master
> in 0.20, so that is still not there yet?
>
> On Tue, Jun 16, 2009 at 2:04 PM, Ryan Rawson <ryanobjc@gmail.com> wrote:
>
> > HBase itself doesn't strictly have any SPOF in 0.20.  Multiple master
> > failover, etc.
> >
> > HBase depends on HDFS, which does have a SPOF in it's namenode.  If that
> > goes down, everything is down.  Generally speaking, namenode is reliable,
> > but the hardware is the issue.  You can have a quick recovery, but still
> > outage.
> >
> >
> > HBase isn't explicitly designed to run across a WAN split between 2
> > datacenters.  It's certainly possible, but during certain link-down
> > scenarios you are looking at cluster splits.  HBase master will decide
> > those
> > regionservers no longer reachable have died, and HDFS will assume those
> > datanodes lost are gone, and start to replicate data.
> >
> > In HBase 0.21, we are hoping to have replication support between
> clusters.
> >
> > -ryan
> >
> >
> > On Tue, Jun 16, 2009 at 1:53 PM, Fred Zappert <fzappert@gmail.com>
> wrote:
> >
> > > Hi,
> > >
> > > We're considering HBase for a customer-facing SaaS.  I saw some
> > references
> > > to Master instance, and failure/failover scenarios on this list.
> > >
> > > We would be running this across at least two data centers in different
> > > cities or sates.
> > >
> > > Which leads to the following questions:
> > >
> > > 1. Are there any single points of failure in an HBase configuration.
> > >
> > > 2: What would be the impact of one data center being down?
> > >
> > > 3: What would be the recovery time and procedure to restore normal
> > > operation
> > > on a new master?
> > >
> > > There are approximately 4M transactions/day
> > >
> > > Thanks,
> > >
> > > Fred.
> > >
> >
>

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