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Zookeeper >> mail # user >> zookeeper on SSD


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Jun Rao 2012-10-03, 16:59
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Patrick Hunt 2012-10-04, 01:13
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Re: zookeeper on SSD
Patrick,

Thanks for the info. Does each ZK write wait for log being flushed to disk?

Jun

On Wed, Oct 3, 2012 at 6:13 PM, Patrick Hunt <[EMAIL PROTECTED]> wrote:

> My experience with SSDs and ZK has been discouraging. SSDs have some
> really terrible corner cases for latency. I've seen them take 40+
> seconds (that's not a mistake - seconds) for fsync to complete. When
> this happened (every few hours) all of the sessions would timeout.
>
> See this article:
> http://storagemojo.com/2012/06/07/the-ssd-write-cliff-in-real-life/
>
> Patrick
>
> On Wed, Oct 3, 2012 at 9:59 AM, Jun Rao <[EMAIL PROTECTED]> wrote:
> > Hi,
> >
> > Will storing the ZK commit log on SSD improve ZK write latency? Does a ZK
> > write wait until data is flushed to disk?
> >
> > Thanks,
> >
> > Jun
>
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Milind Parikh 2012-10-04, 04:32
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Patrick Hunt 2012-10-04, 04:28
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Ted Dunning 2012-10-04, 04:28
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Andrew Purtell 2012-10-04, 04:39
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Ted Dunning 2012-10-04, 04:51
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Ben Bangert 2012-10-04, 16:05
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Flavio Junqueira 2012-10-17, 20:42