Re: when to use broadcast variables

[Patrick Wendell]

Broadcast variables need to fit entirely in memory - so that's a
pretty good litmus test for whether or not to broadcast a smaller
dataset or turn it into an RDD.

On Fri, May 2, 2014 at 7:50 AM, Prashant Sharma  wrote:
> I had like to be corrected on this but I am just trying to say small enough
> of the order of few 100 MBs. Imagine the size gets shipped to all nodes, it
> can be a GB but not GBs and then depends on the network too.
>
> Prashant Sharma
>
>
> On Fri, May 2, 2014 at 6:42 PM, Diana Carroll  wrote:
>>
>> Anyone have any guidance on using a broadcast variable to ship data to
>> workers vs. an RDD?
>>
>> Like, say I'm joining web logs in an RDD with user account data.  I could
>> keep the account data in an RDD or if it's "small", a broadcast variable
>> instead.  How small is small?  Small enough that I know it can easily fit in
>> memory on a single node?  Some other guideline?
>>
>> Thanks!
>>
>> Diana
>
>

Re: when to use broadcast variables

[Prashant Sharma]

I had like to be corrected on this but I am just trying to say small enough
of the order of few 100 MBs. Imagine the size gets shipped to all nodes, it
can be a GB but not GBs and then depends on the network too.

Prashant Sharma


On Fri, May 2, 2014 at 6:42 PM, Diana Carroll  wrote:

> Anyone have any guidance on using a broadcast variable to ship data to
> workers vs. an RDD?
>
> Like, say I'm joining web logs in an RDD with user account data.  I could
> keep the account data in an RDD or if it's "small", a broadcast variable
> instead.  How small is small?  Small enough that I know it can easily fit
> in memory on a single node?  Some other guideline?
>
> Thanks!
>
> Diana
>

when to use broadcast variables

[Diana Carroll]

Anyone have any guidance on using a broadcast variable to ship data to
workers vs. an RDD?

Like, say I'm joining web logs in an RDD with user account data.  I could
keep the account data in an RDD or if it's "small", a broadcast variable
instead.  How small is small?  Small enough that I know it can easily fit
in memory on a single node?  Some other guideline?

Thanks!

Diana