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https://issues.apache.org/jira/browse/HBASE-26274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17419529#comment-17419529
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Hudson commented on HBASE-26274:
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Results for branch branch-2.4
[build #202 on
builds.a.o|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/branch-2.4/202/]:
(x) *{color:red}-1 overall{color}*
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> Create an option to reintroduce BlockCache to mapreduce job
> -----------------------------------------------------------
>
> Key: HBASE-26274
> URL: https://issues.apache.org/jira/browse/HBASE-26274
> Project: HBase
> Issue Type: Bug
> Components: BlockCache, HFile, mapreduce
> Affects Versions: 3.0.0-alpha-1, 2.4.6
> Reporter: Tak-Lon (Stephen) Wu
> Assignee: Tak-Lon (Stephen) Wu
> Priority: Major
> Fix For: 3.0.0-alpha-1, 2.5.0, 2.3.7, 2.4.7
>
>
> In HBASE-21498 (see [this
> commit|https://github.com/apache/hbase/commit/27a0f205c52f83fe7500ee2ffc6cf6582f565a63#diff-8a3e39e6df1afe47811fc17702da598fe0d80496d66e579bea4bd224c6d8da03R218],
> it change the behavior that only region server can initialize on-heap
> BlockCache/LruBlockCache, this should be the right change for HMaster.
> Other downstream dependency that uses getScanner from a file-based region and
> read HStore/HFile lost the BlockCache for caching INDEX/LEAF_INDEX (at least
> still a problem with HBase-2.4) after this change (it worked before) and
> caused performance impact with 2x slower.
> One way to bring back the performance is to allow non-RS and non-HMaster can
> use a compact version of blockcache with smaller memory and less hbase
> internal configuration.
> Or if we can find a way to cache or skip reading the same {{LEAF_INDEX}} when
> scanning the DATA block with HFile.
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