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Audit and possibly update compression codecs for ClickHouse data #4060

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@bnaecker

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@bnaecker

We're currently using the default compression codecs for all metric data in ClickHouse, which is LZ4 on the data blocks on disk. This is probably good for most cases, but particularly for numeric data, it is possible to do much better. There are a number of codecs tailored for numeric data, most notably double delta and Gorilla. We should investigate these, and, if they offer significant savings over the default LZ4, we should switch to them.

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