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From Cosmin Lehene <cleh...@adobe.com>
Subject Re: Question on Availability
Date Fri, 07 Nov 2008 15:20:42 GMT
Updating all region servers configuration to reflect the new master address and restarting
the cluster will do it. It's a matter of minutes. We tested this and I can confirm it works.

Cosmin


On 11/7/08 4:52 PM, "Jean-Daniel Cryans" <jdcryans@apache.org> wrote:

Michael,

The Namenode is also a SPOF.

On keeping a separate cluster for failover, until we add higher
availability, it depends on how much uptime you need to provide I guess. I
personally never saw a machine hosting a Master failing, so I'm not sure on
how clean it can be regards the META, but I think that just closing your
region servers, changing the config for the master then restart the cluster
with a new master would be nearly enough provided that the Namenode was
hosted on another machine. Maybe Jim or Stack can confirm?

J-D

On Fri, Nov 7, 2008 at 5:33 AM, Michael Dagaev <michael.dagaev@gmail.com>wrote:

> Hi, all
>
>    I guess that Hbase master server is a single point of failure. Is
> it correct ? Does Hbase (I mean the whole stack -- HDFS + Hbase) have
> any other single point of failure ?
>
>    If Hbase has a single point of failure we should arrange a backup
> Hbase cluster to switch to it in case of failure. Does it make sense ?
>
> Thank you for your cooperation,
> M.
>


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