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https://issues.apache.org/jira/browse/HBASE-24915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17182356#comment-17182356
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Hudson commented on HBASE-24915:
--------------------------------
Results for branch master
[build #14 on
builds.a.o|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/master/14/]:
(x) *{color:red}-1 overall{color}*
----
details (if available):
(/) {color:green}+1 general checks{color}
-- For more information [see general
report|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/master/14/General_20Nightly_20Build_20Report/]
(x) {color:red}-1 jdk8 hadoop3 checks{color}
-- For more information [see jdk8 (hadoop3)
report|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/master/14/JDK8_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 jdk11 hadoop3 checks{color}
-- For more information [see jdk11
report|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/master/14/JDK11_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 source release artifact{color}
-- See build output for details.
(x) {color:red}-1 client integration test{color}
--Failed when running client tests on top of Hadoop 2. [see log for
details|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/master/14//artifact/output-integration/hadoop-2.log].
(note that this means we didn't run on Hadoop 3)
> Improve BlockCache read performance by specifying BlockType
> -----------------------------------------------------------
>
> Key: HBASE-24915
> URL: https://issues.apache.org/jira/browse/HBASE-24915
> Project: HBase
> Issue Type: Improvement
> Components: BlockCache, Performance
> Reporter: fanrui
> Assignee: fanrui
> Priority: Major
>
> CombinedBlockCache contains l1Cache and l2Cache. l1Cache stores MetaBlock and
> l2Cache stores DataBlock. Because getBlock does not know the BlockType, the
> getBlock of CombinedBlockCache queries l1Cache first, and then l2Cache. But
> actually querying DataBlock is not necessary to query l1Cache.
> Therefore, in some cases where BlockType is known, BlockCache read
> performance can be improved.
> h2. Codeļ¼
> BlockCache: default call old getBlock
> {code:java}
> default Cacheable getBlock(BlockCacheKey cacheKey, boolean caching, boolean
> repeat,
> boolean updateCacheMetrics, BlockType blockType) {
> return getBlock(cacheKey, caching, repeat, updateCacheMetrics);
> }
> {code}
> CombinedBlockCache:
> {code:java}
> @Override
> public Cacheable getBlock(BlockCacheKey cacheKey, boolean caching, boolean
> repeat,
> boolean updateCacheMetrics, BlockType blockType) {
> if (blockType == null) {
> return getBlock(cacheKey, caching, repeat, updateCacheMetrics);
> }
> boolean metaBlock = isMetaBlock(blockType);
> if (metaBlock) {
> return l1Cache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
> } else {
> return l2Cache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
> }
> }private boolean isMetaBlock(BlockType blockType) {
> return blockType.getCategory() != BlockCategory.DATA;
> }
> {code}
> HFileReaderImpl#getCachedBlock call BlockCache#getBlock(XXX,
> expectedBlockType)
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