[jira] Commented: (DERBY-3116) totalSpace not properly initialized in AllocPage

["Knut Anders Hatlen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-3116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12585511#action_12585511 ] 

Knut Anders Hatlen commented on DERBY-3116:
-------------------------------------------

Committed to trunk with revision 644698.

> 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: 10.4.0.0
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>            Priority: Minor
>         Attachments: d3116-1.diff, d3116-2.diff
>
>
> 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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