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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-5089) Improve tracing/logging of runtime exceptions raised in the istat thread
Date Sun, 06 Mar 2011 11:27:46 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kristian Waagan updated DERBY-5089:
-----------------------------------

    Attachment: derby-5089-1a-improved_tracing.diff

Attached patch 1a, which adds tracing of runtime exceptions. It also adds logging of checked
exceptions in some cases.

Committed to trunk with revision 1078449.

The best way to read the information emitted by the istat thread is to enable both logging
and tracing, and then grepping for "istat" in the derby.log.

I except that logging/tracing needs another iteration of work after 10.8.1, i.e. what information
to log, what to trace etc. The logging may still be a bit too chatty, and one possible solution
is to use more than one level of logging (i.e. log only the fact that a table has had all
associated index statistics updated on the lowest level).
Another solution is to introduce log categories, i.e. SCHEDULE, STATS, SCAN_DURATIONS, but
currently I'm more in favor of reducing the overall volume and keeping this simple.

We can discuss this further if/when the need for better observability, and configuration,
arises.

> Improve tracing/logging of runtime exceptions raised in the istat thread
> ------------------------------------------------------------------------
>
>                 Key: DERBY-5089
>                 URL: https://issues.apache.org/jira/browse/DERBY-5089
>             Project: Derby
>          Issue Type: Improvement
>          Components: Services, Store
>    Affects Versions: 10.8.0.0
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>            Priority: Minor
>         Attachments: derby-5089-1a-improved_tracing.diff
>
>
> For the sake of observability and debugging in the wild, the tracing and/or logging of
runtime exceptions raised in the istat thread should be improved.

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