Describe how Compression is used in RocksDB?

RocksDB can compress the data blocks inside SSTables to reduce disk space usage and the amount of data that needs to be read from storage.

• Supports multiple compression algorithms, letting an operator choose a trade-off between compression ratio and CPU cost
• Can be configured differently per level, for example using faster, lighter compression on frequently-accessed upper levels and heavier compression on colder, lower levels
• Reduces I/O for reads that touch compressed blocks, at the cost of CPU time spent decompressing them

This per-level flexibility lets an operator tune compression separately for hot, frequently-touched data versus cold, rarely-accessed data sitting in the lowest levels.

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