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https://issues.apache.org/jira/browse/HBASE-30225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18090063#comment-18090063
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Hudson commented on HBASE-30225:
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Results for branch branch-2.6
[build #82 on
builds.a.o|https://ci-hbase.apache.org/job/HBase-Integration-Test/job/branch-2.6/82/]:
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details (if available):
(/) {color:green}+1 client integration test for 2.10.2 {color}
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> Performance degradation observed on ycsb reads benchmark after HBASE-29727
> --------------------------------------------------------------------------
>
> Key: HBASE-30225
> URL: https://issues.apache.org/jira/browse/HBASE-30225
> Project: HBase
> Issue Type: Bug
> Affects Versions: 3.0.0-beta-1, 2.6.6
> Reporter: Wellington Chevreuil
> Assignee: Wellington Chevreuil
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.7.0, 3.0.0-beta-2, 2.6.7
>
> Attachments: flame-graph-zoomed.png, flamegraph-high-level.png
>
>
> In HBASE-29727 we replaced a single Path attribute by three String fields for
> region, column family and file names, respectively. Since these values tend
> to have a high level of redundancy on large caches (same region, family and
> file names for many different blocks), we introduced the usage of string pool
> to avoid string value repetition and save heap allocation.
> When executing ycsb read workloads, we observed a ~30% latency degradation
> The problem was that we added logic for parsing the file Path into region
> name, family name, as well checks for archiving all on the BlockCacheKey
> constructor used by HFileReaderImpl on the beginning of each block read. As
> seen on the flame graphs attached covering a five minutes window on one of
> the RSes, around 30% of the CPU time was spent on the BlockCacheKey
> constructor, either calling Path.getParent() or HFileUtils.isHFileArchived().
> !flamegraph-high-level.png!
> !flame-graph-zoomed.png!
>
>
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