Wellington Chevreuil created HBASE-27474:
--------------------------------------------
Summary: Evict blocks on split/merge; Avoid caching
reference/hlinks if compaction is enabled
Key: HBASE-27474
URL: https://issues.apache.org/jira/browse/HBASE-27474
Project: HBase
Issue Type: Improvement
Affects Versions: 3.0.0-alpha-3
Reporter: Wellington Chevreuil
Assignee: Wellington Chevreuil
This change aims to improve block cache usage upon splits/merges. On a
split/merge event the following main steps happen:
1) parent regions are closed; 2) daughters are created and opened with
refs/hlinks; 3) Compaction is triggered soon after the daughters get online;
With "hbase.rs.evictblocksonclose" set to false, we keep all blocks for the
closed regions in 1, then will try to load same blocks again on 2 (since we are
using the refs/links for the cache key), just to throw it away and cache the
compaction resulting file in 3.
If the block cache is close to its capacity, blocks from the compacted files in
3 will likely miss the cache.
The proposal here is to always evict blocks for parent regions on a split/merge
event, and also avoid caching blocks for refs/hlinks if compactions are
enabled.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
