[collectd] exec-plugin does not get data

[Bruno Prémont]

Hi Francesco,

After what delay are you checking your RRD file's content?

Probably collectd is caching the values for some time before writing
them out to the RRD file. (see config settings of rrdtool plugin and
eventually also network plugin if you use it)

You could dump the RRD file to see when the last value was written and
if the value is expected. If collected still has values cached you would
see an older timestamp for the last value written to the RRD file.

Bruno

On Thu, 26 March 2009 Francesco Sordillo <f.sordillo at cineca.it> wrote:
> Hi to all.
> 
> I am new here.
> I installed collectd 4.5.1 on my SLES 10. I developed a bash script
> for exec-plugin with "while loop". The output of my script is like
> this one.
> 
> ###############
> PUTVAL siss02/iozone-siss_devel_http/iozone_sequential interval="7"
> 1238087067:1.57935:0.101224
> 
> PUTVAL siss02/iozone-siss_devel_http/iozone_random interval="6"
> 1238087447:390.846:193.861 ###############
> 
> I defined two types in types.db
> ###############
> iozone_sequential       read:GAUGE:0:U, write:GAUGE:0:U
> iozone_random   read:GAUGE:0:U, write:GAUGE:0:U
> ###############
> 
> When I start collectd it works just for the first time that strings
> are printed with "echo". So I get my rrd file.
> 
> ##################
> <myhost>/iozone-siss_devel_http/iozone_random.rrd
> <myhost>/iozone-siss_devel_http/iozone_sequential.rrd
> ##################
> 
> Every run of my script updates rrd file (ls -al) BUT when I look into
> rrd file it seems like rrd file are not updated.
> 
> ######### rrdtool info iozone_random.rrd ###########
> filename = "iozone_random.rrd"
> rrd_version = "0003"
> step = 7
> last_update = 1238087305
> ds[read].type = "GAUGE"
> ds[read].minimal_heartbeat = 14
> ds[read].min = 0.0000000000e+00		<-------- ???
> ds[read].max = NaN			<-------- ???
> ds[read].last_ds = "UNKN"		<-------- ???
> ds[read].value = NaN			<-------- ???
> ds[read].unknown_sec = 0
> ds[write].type = "GAUGE"
> ds[write].minimal_heartbeat = 14
> ds[write].min = 0.0000000000e+00	<-------- ???
> ds[write].max = NaN			<-------- ???
> ds[write].last_ds = "UNKN"		<-------- ???
> ds[write].value = NaN			<-------- ???
> ds[write].unknown_sec = 0
> rra[0].cf = "AVERAGE"
> rra[0].rows = 1200
> rra[0].pdp_per_row = 1
> rra[0].xff = 1.0000000000e-01
> rra[0].cdp_prep[0].value = NaN
> rra[0].cdp_prep[0].unknown_datapoints = 0
> rra[0].cdp_prep[1].value = NaN
> rra[0].cdp_prep[1].unknown_datapoints = 0
> 
> .............
> 
> rra[12].cdp_prep[0].value = 7.9821600000e+02
> rra[12].cdp_prep[0].unknown_datapoints = 3017
> rra[12].cdp_prep[1].value = 3.7773800000e+02
> rra[12].cdp_prep[1].unknown_datapoints = 3017
> rra[13].cf = "MIN"
> rra[13].rows = 1201
> rra[13].pdp_per_row = 3764
> rra[13].xff = 1.0000000000e-01
> rra[13].cdp_prep[0].value = 3.9910800000e+02
> rra[13].cdp_prep[0].unknown_datapoints = 3017
> rra[13].cdp_prep[1].value = 1.8886900000e+02
> rra[13].cdp_prep[1].unknown_datapoints = 3017
> rra[14].cf = "MAX"
> rra[14].rows = 1201
> rra[14].pdp_per_row = 3764
> rra[14].xff = 1.0000000000e-01
> rra[14].cdp_prep[0].value = 3.9910800000e+02
> rra[14].cdp_prep[0].unknown_datapoints = 3017
> rra[14].cdp_prep[1].value = 1.8886900000e+02
> rra[14].cdp_prep[1].unknown_datapoints = 3017
> #####################################################
> 
> Why my rrd file are empty? Anyone can help me?
> Thanks.
> 
> Francesco.
>