clear_block_cache

Daria Barysheva

Contents

Definition
Usage
Examples

Definition

Removes all blocks corresponding to the specified table from BlockCache.

CAUTION

This command can significantly impact the query performance, as the subsequent queries will have to retrieve the blocks from the underlying filesystem. Use with caution.

Usage

clear_block_cache '[<namespace_name>:]<table_name>'

Arguments
Parameter	Description
namespace_name	A namespace name
table_name	A table name

Examples

hbase(main):006:0> clear_block_cache 'ns1:temp2'
CacheEvictionStats{evictedBlocks=0, maxCacheSize=1638085504, failedRegionsSize=0, failedRegions=[]}
Took 0.1503 seconds
=> 1

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