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Item7879: VarCachePlugin may cause a topic rendered broken
Item Form Data
Under high load, VarCachePlugin
may cause a page rendered broken. This is mainly because a cache file may be read before it's completely written. There is a possibility of multiple cache updates happen simultaneously and write to the same cache file at the same time. In addition, there is a possibility of a system crash while a cache file is being written. To cope with those situations, data to be cached needs to be written to a temporary file and then renamed. Both the cached data for the HTML body and the HTML head need to be renamed after both are written.