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Posted to issues@drill.apache.org by "Hari Sekhon (JIRA)" <ji...@apache.org> on 2018/05/11 14:13:00 UTC

[jira] [Created] (DRILL-6406) 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

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 &amp; 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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