What is the BlockCache in HBase?
The BlockCache in HBase is a component used to cache data blocks from HFiles. Its main purpose is to accelerate read operations, reduce disk IO, and improve performance. The BlockCache can cache the most frequently accessed data blocks in memory so that they can be accessed faster in the future, thus enhancing read performance. Typically, the BlockCache uses the LRU (Least Recently Used) algorithm to manage the data blocks in the cache, replacing the least commonly used blocks when memory is running low. By adjusting the size of the BlockCache and other configuration parameters, the performance of the HBase system can be optimized.
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