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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (DERBY-2292) Create a VTI which lists all held latches
Date Wed, 17 Sep 2014 12:09:33 GMT

     [ https://issues.apache.org/jira/browse/DERBY-2292?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Knut Anders Hatlen closed DERBY-2292.
-------------------------------------
    Resolution: Won't Fix

This issue was logged because there was a concern when latching was moved out of the lock
manager, that it would be more difficult to debug Derby bugs that caused deadlocks involving
both locks and latches. Since the lock manager no longer knows about latches, it cannot report
such deadlocks as deadlocks, and it cannot report the wait cycle.

Latching has not been done as part of the lock manager for a very long time now, and I cannot
recall any issue where a latch VTI would have been useful for debugging. I think it is unlikely
that such a VTI will be added, so I close the issue as Won't Fix. Feel free to reopen it if
you think it would be useful.

> Create a VTI which lists all held latches
> -----------------------------------------
>
>                 Key: DERBY-2292
>                 URL: https://issues.apache.org/jira/browse/DERBY-2292
>             Project: Derby
>          Issue Type: Improvement
>          Components: Store
>    Affects Versions: 10.3.1.4
>            Reporter: Knut Anders Hatlen
>            Priority: Minor
>
> There should be a way to list all the latches in a system to make it easier to debug
latch deadlocks.



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