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From Billie Rinaldi <bil...@apache.org>
Subject Re: Which key/value pairs are held in memory?
Date Thu, 01 Nov 2012 11:58:17 GMT
On Thu, Nov 1, 2012 at 4:34 AM, Kristopher Kane <kkane.list@gmail.com>wrote:

> In the manual, it is stated that a write is sent to multiple loggers,
> written to the wa log and key/value pairs stored in a memtable and an
> index.
>
> Since the write hits several servers for resiliency, does each of the
> servers that receives the write place the same data in memory or do
> they each place a different portion in memory such that a read could
> span multiple servers for a performance gain?
>

Reads only use a single server, so only the tablet server hosting the
tablet puts the data in memory.  On other machines it is just logged to
disk.

Billie



>
> Thanks,
>
> -Kris
>

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