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From "Ismael Juma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-5679) Add logging to distinguish between internally and externally initiated shutdown of Kafka
Date Tue, 26 Sep 2017 14:26:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-5679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16180833#comment-16180833

Ismael Juma commented on KAFKA-5679:

We added a signal handler for the cases where shutdown is initiated by an external tool. That
should be good enough and avoids issues with duplicate logging when `Exit` is called by CLI
tools. If we ever run into issues where it's still unclear why Kafka was terminated, we can
consider additional improvements.

> Add logging to distinguish between internally and externally initiated shutdown of Kafka
> ----------------------------------------------------------------------------------------
>                 Key: KAFKA-5679
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5679
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions:
>            Reporter: Apurva Mehta
>            Assignee: Rajini Sivaram
>             Fix For: 1.0.0
> Currently, if there is an internal error that triggers a shutdown of the Kafka server,
the {{Exit}} class is used, which begins the shutdown procedure. The other way a shutdown
is triggered is by {{SIGTERM}} or some other signal.
> We would like to distinguish between shutdown due to internal errors and external signals.
This helps when debugging. Particularly, a natural question when a broker shuts down unexpectedly
is:  "did the deployment system send the signal or is there some un logged fatal error in
the broker"? 
> Today, we rely on callers of {{Exit}} to log the error before making the call. However,
this won't always have 100% coverage. It would be good to add a log message in {{Exit}} to
record that an exit method was invoked explicitly. 
> We could also add a signal handler to log when {{SIGTERM}}, {{SIGKILL}} etc. are received.
> This would make operating Kafka a bit easier.

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