I have a small cluster running HDP 184.108.40.20691 with Ambari 220.127.116.11 the I inherited
The Yarn Timeline service starts but gets a constant critical alert
ATSv2 HBase Application The HBase application reported a 'FAILED' state. Check took 2.261s
The hadoop-yarn-timelinereader.log shows
failed on connection exception: org.apache.hbase.thirdparty.io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused:server.name:17020
I added that port (17020) to the firewall on the server in question, restarted the Timeline Service V2.0 Reader service but still getting the same error.
Any suggestions would be appreciated
"Connection refused" errors usually means that the server is reachable but not accepting connections on that port. If it was a firewall issue you should've seen a "connection timeout" type of error.
This might mean that either (a) the service running on the target server is not actually running or (b) it has been configured with a different port.
Have you tried telneting into that port to check if it's open at all? Try this locally from the server and remotely from where the ATS is running.
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@wazzu62, have you tried @araujo's suggestions? Has the reply helped resolve your issue? If so, can you please mark the appropriate reply as the solution? It will make it easier for others to find the answer in the future.