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From Jonathan Gray <jg...@facebook.com>
Subject RE: HBase in a virtual cluster
Date Thu, 25 Mar 2010 15:17:04 GMT
I'm not sure exactly what you're referring to with currentTimeMillis() being unreliable on
virtual machines.

Regardless of your environment, you should be running NTP to synchronize clocks.

Otherwise, take a look in the mailing archives, there have been a number of lengthy discussions
on HBase on EC2 (or other services).  Also check out the presentations on the wiki.  Andrew
Purtell has a recent presentation on HBase+EC2.


> -----Original Message-----
> From: Andrey [mailto:atimerbaev@gmx.net]
> Sent: Thursday, March 25, 2010 8:08 AM
> To: hbase-user@hadoop.apache.org
> Subject: HBase in a virtual cluster
> Hi All,
> Has anyone got experience in using HBase in a cluster of virtual
> machines (not
> dedicated HW nodes)? Is that configuration reliable enough to build
> production
> systems upon it?
> As far as I understand, Java timing functions (like
> System.curentTimeMillis(),
> Thread.sleep() etc.) work unprecisely in virtual machines, so any kind
> of
> unsynchronization between nodes is possible.  For that reason (it’s my
> understanding), the virtual clusters are generally bad idea when using
> HBase.
> Correct me, if I’m wrong.
> Any comments are appreciated.

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