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

Setting this option is equivalent to calling the setCacheBlocks 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_CACHING query option.

Type: Boolean; recognized values are 1 and 0, or true and false; any other value interpreted as false

Default: false (shown as 0 in output of SET statement)

Using Impala to Query HBase Tables, HBASE_CACHING Query Option

Page generated September 15, 2016.