HBase performance metrics gotchas?

[Otis Gospodnetic <ot...@yahoo.com>]

Hi,

Are there any gotchas around turning on HBase performance metrics 
gathering/publishing (the stuff described on 
http://hbase.apache.org/docs/current/metrics.html), such as "if you turn this 
on, be prepared to pay N% loss in performance" or some such?

Also, the "file" plugin just logs performance metrics to a log file, is that so?

Thanks,
Otis
P.S.
http://hbase.apache.org/docs/current/metrics.htm may be a bit out of date -
I see additional metrics mentioned on 
https://issues.apache.org/jira/browse/HBASE-2838
----
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Hadoop ecosystem search :: http://search-hadoop.com/

Re: HBase performance metrics gotchas?

[Gary Helmling <gh...@gmail.com>]

Hi Otis,

Enabling metrics really just amounts to periodically pushing the metrics to
whatever MetricsContext is configured, which is decoupled from other cluster
operations.  So I wouldn't expect any measurable performance impact (I
haven't tried measuring though).

Yes, the FileContext output just writes a separate line of comma-separated
name=value metrics for each metrics record to a local file (path set in the
properties file).

--gh


On Wed, Jan 19, 2011 at 9:30 AM, Otis Gospodnetic <
otis_gospodnetic@yahoo.com> wrote:

> Hi,
>
> Are there any gotchas around turning on HBase performance metrics
> gathering/publishing (the stuff described on
> http://hbase.apache.org/docs/current/metrics.html), such as "if you turn
> this
> on, be prepared to pay N% loss in performance" or some such?
>
> Also, the "file" plugin just logs performance metrics to a log file, is
> that so?
>
> Thanks,
> Otis
> P.S.
> http://hbase.apache.org/docs/current/metrics.htm may be a bit out of date
> -
> I see additional metrics mentioned on
> https://issues.apache.org/jira/browse/HBASE-2838
> ----
> Sematext :: http://sematext.com/ :: Solr - Lucene - Hadoop - HBase
> Hadoop ecosystem search :: http://search-hadoop.com/
>