Hi Pjotr, I have been looking further into how to handle use of the object cache alongside the DatabasePager and believe the best option will be for the DatabasePager to disable use of object cache when it's loaded subgraphs and handle the initial query against the object cache and final insertion of loaded subgraphs into the object cache. Caching of images will probably be safe to do within the scope of loading data.
I don't know if it will be worth implementing a form of block in the object cache to hold back attempts to read the same file whilst it's still being loaded. If the second concurrent load attempt is being done by a DatabasePager thread then it'll be safe to block, but this might actually be handled by merging/coupling the DatabaseRequest's so that only one load happens, but two merges can happen later. Such coupling would add quite a bit of complexity though. Thoughts? Robert.
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