This seemed to be due to a bug with how metric names are converted to file
system paths. os.path.join() is used, but the metric path converts into an
absolute path (e.g /org/apache/cassandra). This means you end up doing
something like:
os.path.join('/opt/graphite/storage/whatever', '/org/apache/cassandra/etc')
the metric name gets converted to a path by replacing all dots with slashes. I
just manually tweaked the Python code to strip any leading dots from the metric
name as a temporary workaround.
-Karl
> On Dec 17, 2014, at 11:04 AM, Nigel LEACH <nigel.le...@uk.bnpparibas.com>
> wrote:
>
> I'm running Cassandra Cassandra 2.0.11.83 (via DSE 4.6.0), and Graphite
> 0.9.10. I know a bit about Cassandra, but not much about Graphite.
>
> Our Graphite server exposes system metrics, and also those from the example
> python scripts, successfully.
>
> I can see Cassandra metrics hitting the Graphite server, but in the console
> log, errors suggest they are attempting to load in to the root file system
>
> exceptions.IOError: [Errno 2] No such file or directory:
> '/org/apache/cassandra/metrics/ColumnFamily/system/sstable_activity/WriteTotalLatency/count.wsp'
>
> Whereas, I think, it should be going to something like this
>
> /var/lib/carbon/whisper/carbon/agents/org/apache/cassandra/metrics/ColumnFamily/system/sstable_activity/WriteTotalLatency/count.wsp'
>
> I'm losing the prefix directory path somewhere, but don't know where to
> configure it.
>
> On the Cassandra side all I have added is a call to metricsGraphite.yaml,
> which contains
>
> graphite:
> -
> period: 60
> timeunit: 'SECONDS'
> hosts:
> - host: '10.11.12.13'
> port: 2003
> predicate:
> color: "white"
> useQualifiedName: true
> patterns:
> - "^org.apache.cassandra.metrics.+"
>
> On the Graphite side I simply have the following in Carbons'
> storage-schemas.conf file
>
> [cassandra]
> pattern=cassandra
> retentions = 60:90d
>
> Any hints to what is going wrong?
>
> Many Thanks
> Nigel
>
>
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