Re: about poller_output and rrd_num

The purpose of poller_output is to cache the data returned by all targets for a
given polling interval.
Thus it gets filled when poller.php is run.

After a poller's run, the numbers must be transferred to the rrd files to be
stored permanantely. So you'll find some "rrdtool updates", fetching the data
from poller_output. When rrd files have been updated, it is necessary to delete
the related entries from poller_output as they already have been transferred to
rrd files.

As Cacti now supports different polling intervals, poller_output entries have
the unix_timestamp as a pointer to the interval where the data has been
recorded. This helps deleting the correct poller_outpüut entries for the related
poller interval

Reinhard

On 06.11.2012 14:55, 文正 赵 wrote:
> hi,all. i am using and reading source code on cacti-0.8.8a in windows xp,
> i trace and find poller_output in database is first have data then was deleted,
> so i enter into source code, i encountered to a problem, this occured in lib/poller.php,
> i find process have went into the 433 line,
> -----------------------------------------------
> if ($k > 0) {
>   db_execute("DELETE FROM poller_output WHERE local_data_id IN (" . implode(",", $data_ids) . ")");
>        }
> -----------------------------------------------
> so i find the 419 line ----------------
> if ($item["rrd_num"] <= sizeof($rrd_update_array{$item["rrd_path"]}["times"][$unix_time])) 
> ---------------------------------------
> is executed,this lead to delete sql occured, i test cacti in 2012-11-05,
>  and find rrd_num is always 1 and sizeof(...) is always 6,
> i have questions about this is 
> 1,What is the meaning of rrd_num?
> 2,What is the meaning of sizeof($rrd_update_array{$item["rrd_path"]}["times"][$unix_time]))?
> 3,how can i make  poller_output have data  and not be deleted?
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