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From Bjorn Jonsson <bjorn...@gmail.com>
Subject Re: Distributed cache: how big is too big?
Date Tue, 09 Apr 2013 11:49:17 GMT
Put it once on hdfs with a replication factor equal to the number of DN. No
startup latency on job submission or max size and access it from anywhere
with fs since it sticks around untill you replace it? Just a thought.
On Apr 8, 2013 9:59 PM, "John Meza" <j_mezazap@hotmail.com> wrote:

> I am researching a Hadoop solution for an existing application that
> requires a directory structure full of data for processing.
> To make the Hadoop solution work I need to deploy the data directory to
> each DN when the job is executed.
> I know this isn't new and commonly done with a Distributed Cache.
> *Based on experience what are the common file sizes deployed in a
> Distributed Cache?*
> I know smaller is better, but how big is too big? the larger cache
> deployed I have read there will be startup latency. I also assume there are
> other factors that play into this.
> I know that->Default local.cache.size=10Gb
> -Range of desirable sizes for Distributed Cache= 10Kb - 1Gb??
> -Distributed Cache is normally not used if larger than =____?
> *Another Option:* Put the data directories on each DN and provide
> location to TaskTracker?
> thanks
> John

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