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From Mike Torra <mto...@demandware.com>
Subject Re: weird jvm metrics
Date Wed, 04 Jan 2017 17:02:59 GMT
Just bumping - has anyone seen this before?

http://stackoverflow.com/questions/41446352/cassandra-3-9-jvm-metrics-have-bad-name

From: Mike Torra <mtorra@demandware.com<mailto:mtorra@demandware.com>>
Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Date: Wednesday, December 28, 2016 at 4:49 PM
To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Subject: weird jvm metrics

Hi There -

I recently upgraded from cassandra 3.5 to 3.9 (DDC), and I noticed that the "new" jvm metrics
are reporting with an extra '.' character in them. Here is a snippet of what I see from one
of my nodes:


ubuntu@ip-10-0-2-163:~$ sudo tcpdump -i eth0 -v dst port 2003 -A | grep 'jvm'

tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes

.Je..l>.pi.cassandra.us-east-1.cassy-node1.jvm.buffers..direct.capacity 762371494 1482960946

pi.cassandra.us-east-1.cassy-node1.jvm.buffers..direct.count 3054 1482960946

pi.cassandra.us-east-1.cassy-node1.jvm.buffers..direct.used 762371496 1482960946

pi.cassandra.us-east-1.cassy-node1.jvm.buffers..mapped.capacity 515226631134 1482960946

pi.cassandra.us-east-1.cassy-node1.jvm.buffers..mapped.count 45572 1482960946

pi.cassandra.us-east-1.cassy-node1.jvm.buffers..mapped.used 515319762610 1482960946

pi.cassandra.us-east-1.cassy-node1.jvm.fd.usage 0.00 1482960946

My metrics.yaml looks like this:

graphite:
  -
    period: 60
    timeunit: 'SECONDS'
    prefix: 'pi.cassandra.us-east-1.cassy-node1'
    hosts:
     - host: '#RELAY_HOST#'
       port: 2003
    predicate:
      color: "white"
      useQualifiedName: true
      patterns:
        - "^org.+"
        - "^jvm.+"
        - "^java.lang.+"

All the org.* metrics come through fine, and the jvm.fd.usage metric strangely comes through
fine, too. The rest of the jvm.* metrics have this extra '.' character that causes them to
not show up in graphite.

Am I missing something silly here? Appreciate any help or suggestions.

- Mike

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