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https://issues.apache.org/jira/browse/QPID-4765?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justin Ross updated QPID-4765:
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Fix Version/s: 0.23
> Incorrect parameter validation for legacystore wcache-page-size and
> jfile-size-pgs
> ----------------------------------------------------------------------------------
>
> Key: QPID-4765
> URL: https://issues.apache.org/jira/browse/QPID-4765
> Project: Qpid
> Issue Type: Bug
> Components: C++ Broker
> Reporter: Kim van der Riet
> Assignee: Kim van der Riet
> Priority: Minor
> Fix For: 0.23
>
>
> The store module incorrectly changes the size of the page cache to 64kB when
> the file size parameter is equal to 1 (--jfile-size-pgs=1) for any valid page
> cache size. This should only happen when the page cache size is set to 128kB.
> The legacystore file size is specified in terms of the read cache size (which
> is fixed to 64kB). Hence a jfile-size-pgs set to 1 creates 64kB files, the
> smallest allowed. However, the write page cache, set by the wcache-page-size
> parameter, cannot be larger than the physical file size, as libaio uses DMA
> to write each page, and this cannot be split between files. This can occur
> for only one legal setting of wcache-page-size, ie 128kB. In this case only,
> a check must be made to see if the file size parameter jfile-size-pgs==1. If
> so, then the write cache size exceeds the physical file size, and must be
> reduced to be the same as the physical file size, ie 64kB.
> The logic incorrectly makes this change for all legal write page cache size
> values, not just the maximum of 128kB where this change is required.
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