[jira] [Work stopped] (HIVE-18959) Avoid creating extra pool of threads within LLAP

["slim bouguerra (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-18959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-18959 stopped by slim bouguerra.
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> Avoid creating extra pool of threads within LLAP
> ------------------------------------------------
>
>                 Key: HIVE-18959
>                 URL: https://issues.apache.org/jira/browse/HIVE-18959
>             Project: Hive
>          Issue Type: Task
>          Components: Druid integration
>         Environment: Kerberos Cluster
>            Reporter: slim bouguerra
>            Assignee: slim bouguerra
>            Priority: Major
>             Fix For: 3.0.0
>
>         Attachments: HIVE-18959.patch
>
>
> The current Druid-Kerberos-Http client is using an external single threaded pool to handle retry auth calls (eg when a cookie expire or other transient auth issues). 
> First, this is not buying us anything since all the Druid Task is executed as one synchronous task.
> Second, this can cause a major issue if an exception occurs that leads to shutting down the LLAP main thread with an exception like: 
> {code} org.apache.hadoop.hive.llap.daemon.impl.LlapDaemon: Thread Thread[KerberosHttpClient... threw an Exception. Shutting down now...{code}
>  Thus to fix this we should avoid using an external thread pool and handle retrying in a synchronous way.



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