[jira] [Commented] (NIFI-5556) Expose JVM debugging via command-line argument

["Troy Melhase (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NIFI-5556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16818393#comment-16818393 ] 

Troy Melhase commented on NIFI-5556:
------------------------------------

I'd like to tackle this, and my preference is to use environment variables to keep the cli simple and the changes small.  Feedback welcome.

> Expose JVM debugging via command-line argument
> ----------------------------------------------
>
>                 Key: NIFI-5556
>                 URL: https://issues.apache.org/jira/browse/NIFI-5556
>             Project: Apache NiFi
>          Issue Type: New Feature
>          Components: Configuration, Tools and Build
>    Affects Versions: 1.7.1
>            Reporter: Andy LoPresto
>            Priority: Major
>              Labels: debug, jvm, toolkit
>
> Recently I have been performing remote JVM debugging on a number of NiFi components -- core instances, TLS toolkit, etc. Currently, to enable/disable JVM debugging requires manually modifying the {{bootstrap.conf}} file or the {{*.sh}} file and (un)commenting/adding the following line(s): 
> *bootstrap.conf*
> {code}
> java.arg.debug=-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8000
> {code}
> *tls-toolkit.sh*
> {code}
> # exec "${JAVA}" -cp "${CLASSPATH}" ${JAVA_OPTS:--Xms12m -Xmx24m} org.apache.nifi.toolkit.tls.TlsToolkitMain "$@"
>    exec "${JAVA}" -cp "${CLASSPATH}" ${JAVA_OPTS:--Xms12m -Xmx24m} -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8000 org.apache.nifi.toolkit.tls.TlsToolkitMain "$@"
> {code}
> I propose we decide on a standard command-line flag or environment variable which can be set to enable/disable JVM debugging (and optional flag/variable to enable/disable *suspend*) in order to make this easier for developers. 
> My suggestion is to follow a pattern like Kafka uses, as proposed in [this StackOverflow answer|https://stackoverflow.com/a/52021140/70465]. 
> This can be copied to NiFi Registry, MiNiFi Java, etc. 



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