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HBase Administration Cookbook by Yifeng Jiang

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Configuring block cache for column families

HBase supports block cache to improve read performance. When performing a scan, if block cache is enabled and there is room remaining, data blocks read from StoreFiles on HDFS are cached in region server's Java heap space, so that next time, accessing data in the same block can be served by the cached block. Block cache helps in reducing disk I/O for retrieving data.

Block cache is configurable at table's column family level. Different column families can have different cache priorities or even disable the block cache. Applications leverage this cache mechanism to fit different data sizes and access patterns.

In this recipe, we will describe how to configure block cache for column families and tips to ...

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