Using Apache HBase to store and access data
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Configuring BlockCache

You can configure BlockCache in two different ways in HBase: the default on-heap LruBlockCache and the BucketCache, which is usually off-heap.

If you have less than 20 GB of RAM available for use by HBase, consider tailoring the default on-heap BlockCache implementation (LruBlockCache) for your cluster.

If you have more than 20 GB of RAM available, consider adding off-heap BlockCache (BucketCache).