This is the documentation for Impala 2.1.x, included as part of CDH 5.3.x.
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HBASE_CACHING Query Option

Setting this option is equivalent to calling the setCaching method of the class org.apache.hadoop.hbase.client.Scan, in an HBase Java application. Helps to control the memory pressure on the HBase region server, in conjunction with the HBASE_CACHE_BLOCKS query option.

Type: BOOLEAN

Default: 0

Using Impala to Query HBase Tables, HBASE_CACHE_BLOCKS Query Option

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