-Re: Set scanner caching to a better default?
Doug Meil 2012-10-17, 12:27
100 is a good idea. It's one of the most common questions on the
dist-list (e.g., hey my MR job is slow? answer: set caching to something
more than 1).
On 10/17/12 1:12 AM, "Stack" <[EMAIL PROTECTED]> wrote:
>On Tue, Oct 16, 2012 at 8:25 PM, lars hofhansl <[EMAIL PROTECTED]>
>> We just ran into this again today, where we forgot to set scanner
>>caching and observed bad performance.
>> The default of 1 does not seem to make any sense (except for very
>>specific case of large/wide rows).
>> Any value between 10 and 1000 should be OK, really. Maybe the default
>>should be 100.
>> This would also go some way to avoid the perception that HBase is slow
>>for folks who are just playing around with it.
>I'd say all our defaults could do w/ an edit but am fine starting w/
>this one alone (Or we have the UI come w/ flashing neon saying the
>configs are super conservative and must be tuned).