How can I find the root cause of a "monitored DSE down" in the OpsCenter UI?

Question

question

igor.rmarinho_185445 asked Apr 15, '20 Erick Ramirez answered Apr 16, '20

How can I find the root cause of a "monitored DSE down" in the OpsCenter UI?

Hi all,

I'm having an issue... All 3 nodes have the same config, but one node the monitored dse is down. Is there a file or something that I can check to find the root cause of it?

I checked all agent files, opscenter files etc...

Any thoughts on it?

Thank you.

Screen Shot 2020-04-15 at 5.20.59 PM.png

opscenter agent

screen-shot-2020-04-15-at-52059-pm.png (84.8 KiB)

10 |1000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 1.0 MiB each and 10.0 MiB total.

DataStax Enterprise is powered by the best distribution of Apache Cassandra ™

Apache, Apache Cassandra, Cassandra, Apache Tomcat, Tomcat, Apache Lucene, Lucene, Apache Solr, Apache Hadoop, Hadoop, Apache Spark, Spark, Apache TinkerPop, TinkerPop, Apache Kafka and Kafka are either registered trademarks or trademarks of the Apache Software Foundation or its subsidiaries in Canada, the United States and/or other countries.

Privacy Policy Terms of Use

Answer 1 · 2020-04-15T21:39:11Z

dmngaya answered Apr 15, '20 igor.rmarinho_185445 commented Apr 15, '20

Hi,

Maybe you did that , if not can you verify errors from opscenterd.log for opscenter, agent.log for datastax agent and also system.log and debug.log to see if there are some errors.

Best,

Dieudonne.

1 Share

10 |1000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 1.0 MiB each and 10.0 MiB total.

igor.rmarinho_185445 commented · Apr 15, 2020 at 11:18 PM

Thanks dmgaya,

I was missing the agent.log, found the problem.

Thanks!

0 ·

Answer 2 · 2020-04-16T04:18:20Z

Erick Ramirez answered Apr 16, '20

@igor.rmarinho_185445 "Monitored DSE" in the OpsCenter agents status view refers to the DSE node that is being monitored. With the UI itself, you can click on the red exclamation mark to get additional information on it. Here's a sample extract of the additional info you can get:

    "last_seen": 1587010226,
    "version": "6.7.5",
    "condition": "NODE_DOWN",
    "install_status": {
      "error-message": null,
      "state": null
    },
    "jmx": {
      "updated_at": 1587010226,
      "last_up": 1587009818,
      "status": "down"
    },
    "monitored_cassandra": {
      "updated_at": 1587010226,
      "last_up": 1587009818,
      "status": "down"
    },

In the example above, you can see that the agent has flagged it as NODE_DOWN and the monitored DSE/Cassandra instance also has a "down" status. You should then check the logs to determine why the node is unavailable.

For more information on using the OpsCenter web interface, see DataStax Agents Status View which contains links to troubleshooting steps. Cheers!

Share

10 |1000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 1.0 MiB each and 10.0 MiB total.

question