totalSpace not properly initialized in AllocPage
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Key: DERBY-3116
URL: https://issues.apache.org/jira/browse/DERBY-3116
Project: Derby
Issue Type: Bug
Components: Store
Affects Versions: 10.4.0.0
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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