Xuesen Liang created HBASE-27002:
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Summary: Config BucketCache as victim of LRUCache
Key: HBASE-27002
URL: https://issues.apache.org/jira/browse/HBASE-27002
Project: HBase
Issue Type: Improvement
Components: BlockCache, BucketCache
Reporter: Xuesen Liang
Assignee: Xuesen Liang
Bucket cache is no longer as a victim handler for LRU by HBASE-19357.
{noformat}
When BC is used, data blocks will be strictly on BC only where as index/bloom
blocks are on LRU L1 cache.
{noformat}
In this situation, the LRU cache's memory is totally on heap.
If the index and bloom filters on a region server are big, then a big LRU cache
will introduce more GC cost.
So we should add a *configuration for user* to choose victim handler.
A small LRU cache with a big victim offheap bucket cache can reduce GC cost.
For example: a region server has 5GB index, 80 GB bloom filter, and 256GB DRAM,
its configurations can be as follow:
{code:xml}
export HBASE_REGIONSERVER_OPTS="-Xms40g -Xmx40g -XX:MaxDirectMemorySize=180g"
{code}
{code:xml}
<property>
<name>hbase.bucketcache.as.lrucache.victim</name>
<value>true</value>
</property>
<property>
<name>hfile.block.cache.size</name>
<value>0.3</value>
</property>
<property>
<name>hbase.bucketcache.ioengine</name>
<value>offheap</value>
</property>
<property>
<name>hbase.bucketcache.size</name>
<value>160000</value>
</property>
{code}
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