Data sources show 0 in rrd with data input method script

Ryan Rawdon <[email protected]>
Newsgroups gmane.network.cacti.user
Message-ID <[email protected]>
Hello all,

I have written a python script which in turn queries a cloud service management API to get information about a storage mechanism (nor important).

The script prints out 7 field-value pairs for cacti to parse while polling:
entityblobassoc:7314 failedworkitems:4 mydeployments:24 sqlbac:2 wad-control-container:97 workerlogs:1343 meta-all:8784

The poller seems to be calling this correctly:
07/16/2012 03:00:26 PM - CMDPHP: Poller[0] Host[5] DS[29] CMD: python /opt/opstools/cacti/azure-container-count.py meta-all, output: entityblobassoc:7314 failedworkitems:4 mydeployments:24 sqlbac:2 wad-control-container:97 workerlogs:1343 meta-all:8784

But when I look in the RRD file, a few of the data stores are receiving zero values:
meta-all entityblobassoc failedworkitems mydeployments sqlbac wadcontrolcontainer workerlogs
1342464300: 8.7519499090e+03 0.0000000000e+00 4.0000000000e+00 2.4000000000e+01 2.0000000000e+00 9.7000000000e+01 0.0000000000e+00
1342464600: 8.7840000000e+03 -nan 4.0000000000e+00 2.4000000000e+01 2.0000000000e+00 9.7000000000e+01 -nan
1342464900: 8.7840000000e+03 -nan 4.0000000000e+00 2.4000000000e+01 2.0000000000e+00 9.7000000000e+01 -nan
1342465200: 8.7840000000e+03 -nan 4.0000000000e+00 2.4000000000e+01 2.0000000000e+00 9.7000000000e+01 -nan

In particular, the 2nd column of the RRD (entityblobassoc) should be non-zero as you can see from the poller log

Here is the configuration for that field in the data template:
http://r.u13.net/permatemp/entityblobassoc.png

I have spent a few hours trying to figure out why this is happening and look forward to any tips you all can provide 
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