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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4059) If space reclamation cannot obtain container lock it will not retry getting the lock
Date Thu, 19 Feb 2009 18:12:02 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675066#action_12675066
] 

Kathey Marsden commented on DERBY-4059:
---------------------------------------

After observing the behavior with the patch and chatting with Mike, I have come to the conclusion
that the three retries is just really not sufficient.  We will need to something else with
the retries, either have some short wait instead of no wait when trying to get locks, up the
retries or do something more elaborate like Mike suggested in this comment https://issues.apache.org/jira/browse/DERBY-4055?focusedCommentId=12673436#action_12673436

I think I will go ahead and check in this fix as is as it does enable retries when getting
the container lock, even though those retries aren't very useful.  It should make the code
more consistent for whatever solution we settle on to fix this long term.  I will add a comment
to the code that three retries is likely not enough.






> If space reclamation cannot obtain container lock it will not retry getting the lock
> ------------------------------------------------------------------------------------
>
>                 Key: DERBY-4059
>                 URL: https://issues.apache.org/jira/browse/DERBY-4059
>             Project: Derby
>          Issue Type: Sub-task
>          Components: Store
>    Affects Versions: 10.1.3.1, 10.2.2.0, 10.3.3.0, 10.4.2.0, 10.5.0.0
>            Reporter: Kathey Marsden
>            Assignee: Kathey Marsden
>            Priority: Minor
>         Attachments: derby-4059_code_change_diff.txt
>
>
> As noted in DERBY-4054 openContainerNW throws an exception if it canno get the container
lock and bypasses the retry logic.  See:
> https://issues.apache.org/jira/browse/DERBY-4054?focusedCommentId=12673376#action_12673376
> We should catch the exception and retry if we can't get the container lock. This probably
won't fix the repro for DERBY-4054, but should be helpful in some user scenarios.

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