[jira] [Updated] (NIFI-3406) Multiple Improvements needed to ScriptedProcessor's ScriptEngines configuration/information

["Joseph Percivall (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NIFI-3406?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joseph Percivall updated NIFI-3406:
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    Summary: Multiple Improvements needed to ScriptedProcessor's ScriptEngines configuration/information  (was: Multiple Improvements needed to ExecuteScript ScriptEngines configuration/information)

> Multiple Improvements needed to ScriptedProcessor's ScriptEngines configuration/information
> -------------------------------------------------------------------------------------------
>
>                 Key: NIFI-3406
>                 URL: https://issues.apache.org/jira/browse/NIFI-3406
>             Project: Apache NiFi
>          Issue Type: Improvement
>    Affects Versions: 1.1.1
>            Reporter: Joseph Percivall
>            Priority: Blocker
>
> The issue prompting this is that JRuby's default configuration uses a Singleton scope[1]. So all threads will see the same runtime and variables. This means if a FlowFile is currently running within the body of a script, and a new one comes in, the first thread will use the new variables (session, flowfile, etc.). This is obviously a problem and can lead "flowfile not known in this session" and livelocks in the FF repo due to multiple sessions updating the same flowfile[2].
> ExecuteScript needs to 
>    1: give more information about the script engine being run
>    2: provide more configuration options for the script engine it self
>    3: warn the user about the nuances of script engines and how they are not maintained by Apache NiFi so may not follow our best practices.
> This also probably
> [1] https://github.com/jruby/jruby/blob/master/core/src/main/java/org/jruby/embed/ScriptingContainer.java#L198
> Specifically the line: "However, the default, singleton local context scope behave slightly different. If Ruby runtime has been already instantiated by another ScriptingContainer, application, etc, the same runtime will be used."
> [2] https://github.com/JPercivall/nifi/blob/1be08714731f01347ac1f98e18047fe7d9ab8afd/nifi-commons/nifi-write-ahead-log/src/main/java/org/wali/MinimalLockingWriteAheadLog.java#L69-L69



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