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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4685) Dead/unreachable code in OpenConglomerate.lockPositionForWrite()
Date Fri, 29 Oct 2010 09:14:19 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Knut Anders Hatlen updated DERBY-4685:
--------------------------------------

    Attachment: d4685-2.diff

Attaching a patch (#2) that addresses the other issue mentioned in the description. The patch
removes the second parameter (forInsert) in lockPositionForWrite() because it is always false
in the current code, and because the method is not believed to work for inserts anyhow.

> Dead/unreachable code in OpenConglomerate.lockPositionForWrite()
> ----------------------------------------------------------------
>
>                 Key: DERBY-4685
>                 URL: https://issues.apache.org/jira/browse/DERBY-4685
>             Project: Derby
>          Issue Type: Improvement
>          Components: Store
>    Affects Versions: 10.7.1.0
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>            Priority: Minor
>         Attachments: d4685-2.diff, d4685.diff
>
>
> OpenConglomerate.lockPositionForWrite() contains this code twice:
>             if (!waitForLock)
>             {
>                 // throw lock timeout error.
>                 throw StandardException.newException(SQLState.LOCK_TIMEOUT);
>             }
> The second occurrence of this code can never end up throwing an exception, since waitForLock
is guaranteed to be true there because of the identical check a couple of lines above. (Judging
by the similar method lockPositionForRead(), it is probably the first check that should be
removed, so that the latch on the page is released before the exception is thrown.)
> Also, the method is always called with forInsert==false, so the forInsert parameter can
be removed. (I also suspect that the method doesn't work correctly if ever used in an insert
operation, since it calls latchPage(RowPosition) which will unlatch the page if the row isn't
found on the page, and I assume that a row that is about to be inserted does not exist yet.)

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