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Invalidating the data store

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Therefore, if some other entity modifies information used by Impala in the metastore that Impala and Hive share, the information cached by Impala must be updated.However, this does not mean that all metadata updates require an Impala update.

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Product A), you'd use something like '0001' as the field name for the first customization's first version, '0002' for its second version and so forth.I have some product data that I need to store multiple versions of in a Redis cache. The process of obtaining the plain (basic) data is expensive, and the process of customising it into different versions is also expensive, so I'd like to cache all versions to optimise wherever possible.The data structure looks something like this: The data is stored in this way because each step of the data retrieval/calculation process is expensive.This is a relatively expensive operation compared to the incremental metadata update done by the .If you are not familiar with the way Impala uses metadata and how it shares the same metastore database as Hive, see Overview of Impala Metadata and the Metastore for background information.The first time a particular product is retrieved for a region, there will be one set of customisations performed to make it into a region-specific product.The first time a particular product is retrieved for a store, I need to perform customisations based on the regional product to generate the store-specific product.The first approach is to use non-atomic ad-hoc scanning of the tree to identify and invalidate (delete) the tree's 2nd level (1st set of customizations).To do that, use a hierarichal naming scheme for your Hash's fields and iterate through them using .The problem comes in due to the fact that I may need to invalidate data in a few ways: My question is therefore: is there a way of representing this type of multi-level data structure, to allow for the performance of storing the data in multiple levels while enabling invalidation of only parts of the tree?Or, am I limited to expiring the entire tree ( There are at least 3 different ways for doing that, each has its own pros and cons.