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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-3116) totalSpace not properly initialized in AllocPage
Date Mon, 08 Oct 2007 14:06:50 GMT
totalSpace not properly initialized in AllocPage

                 Key: DERBY-3116
                 URL: https://issues.apache.org/jira/browse/DERBY-3116
             Project: Derby
          Issue Type: Bug
          Components: Store
    Affects Versions:
            Reporter: Knut Anders Hatlen
            Priority: Minor

There are some problems with the initialization of totalSpace in AllocPage. It is initialized
in StoredPage.initSpace() which is again called from StoredPage.usePageBuffer(), and it is
set to the value returned from AllocPage.getMaxFreeSpace(). The problems are:

  1) The calculation in getMaxFreeSpace() uses borrowedSpace, but when createIdentity() is
called on an AllocPage, borrowedSpace has not been initialized when getMaxFreeSpace() is called
and the calculated size is wrong.

  2) When a page object is reused, usePageBuffer() is only called if a new byte array must
be allocated (because the new page has a different size than the old page). This means that
the totalSize field gets the same value as in the old page if their sizes are equal, which
is not necessarily correct.

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