[collectd] rrdcached+collectd

[Benjamin Wang (gendwang)]

Hi,
This should be a code fault. When rrdcached plugin is started, rrdcached plugin will create the rrd files with the current value. But after the rrd files
are created, rrdcached plugin will update the same value to rrdcached. The rrdcached will return error. When I update the code as following, it works well:
rc_write method in rrdcached.c
  if (config_create_files)
  {
    struct stat statbuf;

    status = stat (filename, &statbuf);
    if (status != 0)
    {
      if (errno != ENOENT)
      {
        char errbuf[1024];
        ERROR ("rrdcached plugin: stat (%s) failed: %s",
            filename, sstrerror (errno, errbuf, sizeof (errbuf)));
        return (-1);
      }

      status = cu_rrd_create_file (filename, ds, vl, &rrdcreate_config);
      if (status != 0)
      {
        ERROR ("rrdcached plugin: cu_rrd_create_file (%s) failed.",
            filename);
        return (-1);
      }

+      return (0);
    }
  }

The above code will skip the first update when the file is created. What about your comments?

B.R.
Benjamin Wang

From: Cyril Feraudet [mailto:collectd at feraudet.com]
Sent: 2013年3月4日 21:46
To: Benjamin Wang (gendwang)
Cc: collectd at verplant.org; jmauro at anti.net; jmauro at autidot.net; Yang Zhou (yangzho)
Subject: Re: [collectd] rrdcached+collectd

You don't need both rrdtool and rrdcached plugin.

Cyril
http://perfwatcher.org/

On 4 mars 2013, at 14:38, Benjamin Wang (gendwang) <gendwang at cisco.com<mailto:gendwang at cisco.com>> wrote:


Hi,
  I try to setup rrdcached and collectd in one VM(Redhat 6.2). rrdcached also listens on the network port for remote query.
rrdtool: 1.4.7
collectd: 5.2.0

The collectd.conf is as following:
LoadPlugin rrdcached
LoadPlugin rrdtool
<Plugin rrdcached>
        DaemonAddress "unix:/tmp/rrdcached.sock"
        DataDir "/root/tools/rrdcached"
        CreateFiles true
</Plugin>

<Plugin rrdtool>
        DataDir "/opt/collectd/var/lib/collectd"
</Plugin>


The rrdcached start script is as following:
rrdcached -F -b /root/tools/rrdcached -j /root/tools/rrdcached/cached -p /root/tools/rrdcached/rrdcached.pid  -l unix:/tmp/rrdcached.sock -l 10.74.125.141

But the collectd log always show the error:
[2013-03-04 21:24:56] rrdcached plugin: rrdc_update (/root/tools/rrdcached/10.74.125.141/memory/memory-used.rrd, [1362403496:4414574592.000000], 1) failed with status -1.
[2013-03-04 21:24:56] rrdcached plugin: rrdc_update (/root/tools/rrdcached/10.74.125.141/memory/memory-buffered.rrd, [1362403496:363573248.000000], 1) failed with status -1.
[2013-03-04 21:24:56] rrdcached plugin: rrdc_update (/root/tools/rrdcached/10.74.125.141/memory/memory-cached.rrd, [1362403496:1231032320.000000], 1) failed with status -1.

I have gone through the old threads and have tried “chmod 777 /root/tools/rrdcached”. But it doesn’t work.

What is the problem?

B.R.
Benjamin Wang
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