accumulo-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Keith Turner <ke...@deenlo.com>
Subject Re: Time delay question
Date Wed, 08 Aug 2012 18:09:42 GMT
Once the batch writer flushes, the data is available for read by the
batch scanner.   On the server side data is read from memory and
files.

On Wed, Aug 8, 2012 at 1:53 PM,  <Bob.Thorman@l-3com.com> wrote:
> I have a set of actors that are doing batchWriters and another set doing
> batchScanner(s) and I'm getting questions from my users about the time
> delay between them.  So my question is, what are all the tunable
> parameters between writes and reads?
>
> Do I have the following facts correct?
>
> BatchWriters have a time value for flushing to memory cache
> Minor compaction has its time frequency for flushing to WALogs
> Major compaction has its time frequency for flushing to disc
>
> So where all does a batchScanner get its data from?
>
> Any/all help is appreciated.
>
>
> Bob Thorman
> Engineering Fellow
> L-3 Communications, ComCept
> 1700 Science Place
> Rockwall, TX 75032
> (972) 772-7501 work
> Bob.Thorman@ncct.af.smil.mil
> rdthorm@nsa.ic.gov
>
>

Mime
View raw message