Hari Sekhon created DRILL-6406:
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Summary: Apache Drill Add Proper Health Check to API - /status
returns "Running" even though Drill isn't usable eg. java classpath errors for
flexjson-*.jar when trying to execute any query
Key: DRILL-6406
URL: https://issues.apache.org/jira/browse/DRILL-6406
Project: Apache Drill
Issue Type: Improvement
Components: Server, Client - HTTP, Execution - Monitoring, Tools,
Build & Test, Web Server
Affects Versions: 1.13.0, 1.10.0
Reporter: Hari Sekhon
I've come across situations on MapR 5.2 / 6.0 where Drill 1.10 / 1.13 is up and
running but there are flexjson jar classpath errors meaning that Drill is not
usable so queries fail even though the API gives the impression that Drill is
available. This is bad for load balancers.
This API needs to be much more robust and terms of checking if Drill is fully
working. I suggest internally doing a health check real query and if that
executes successfully and returns the expected result, only then updating the
status to OK / Running.
This internal health check query should be periodically re-executed (eg. every
30 secs) and the status set to ERROR or something if if fails.
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