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After Auto-Refresh, Cluster Node Graphs Become Blank #362
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I've the same issue, running on CentOS 7.9, after upgrade to 3.7.5, all the graph shows "Empty RRDtool command, Likely bad graph config", previously it was fine (older version) |
I have the same problem on Centos 7.9.2009 ganglia 3.7.2 right now. |
Can also confirm this still happens with 3.7.6 from EPEL 9 |
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Running Ganglia 3.7.2 on CentOS 8, we discovered that the node graphs in the cluster view section of a ganglia cluster report would go blank after an auto-refresh. On load, the graphs would normally show a CPU or network report like this:
then after an auto-refresh, all graphs would be empty, although high load nodes would still have a colored frame, like this:
Initial investigations suggested that graphs fetched after the update were missing a value for the "g" parameter, which specifies the metric to graph. A lot more troubleshooting found that the cluster_refresh.tpl template was not getting the metric_name variable properly set.
I modified cluster_view.php and moved what is currently line 636,
$tpl_data->assign("metric_name", "{$user['metricname']}");
, up to above line 608,if (! $refresh) {
, so the variable would be set for both refresh and non-refresh cases. This seems to fix the issue.I am not offering a means to recreate this issue, so I encourage others to speak up if they have a similar problem.
With that, I leave this issue to the Ganglia Gurus to handle as they see fit.
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