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https://issues.apache.org/jira/browse/HBASE-27867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17726736#comment-17726736
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Hudson commented on HBASE-27867:
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Results for branch branch-2.5
[build #358 on
builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.5/358/]:
(x) *{color:red}-1 overall{color}*
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details (if available):
(x) {color:red}-1 general checks{color}
-- For more information [see general
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.5/358/General_20Nightly_20Build_20Report/]
(/) {color:green}+1 jdk8 hadoop2 checks{color}
-- For more information [see jdk8 (hadoop2)
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.5/358/JDK8_20Nightly_20Build_20Report_20_28Hadoop2_29/]
(/) {color:green}+1 jdk8 hadoop3 checks{color}
-- For more information [see jdk8 (hadoop3)
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.5/358/JDK8_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 jdk11 hadoop3 checks{color}
-- For more information [see jdk11
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.5/358/JDK11_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 source release artifact{color}
-- See build output for details.
(/) {color:green}+1 client integration test{color}
> Close the L1 victim handler race
> --------------------------------
>
> Key: HBASE-27867
> URL: https://issues.apache.org/jira/browse/HBASE-27867
> Project: HBase
> Issue Type: Bug
> Components: BlockCache
> Affects Versions: 2.5.4
> Reporter: Andrew Kyle Purtell
> Assignee: Andrew Kyle Purtell
> Priority: Minor
> Fix For: 2.6.0, 3.0.0-alpha-4, 2.5.5
>
>
> When we evict a block from L1 and move it to L2 there is a brief window of
> time where we have removed the block from the L1 map and yet the victim
> handler has not completed execution. Some read-your-write use cases can be
> significantly impacted even though the window is small. Imagine a use case
> where PRELOAD_DATA_ON_OPEN and CACHE_DATA_ON_WRITE are both enabled to warm
> cache ahead of access and any miss can be problematic. Perhaps a particularly
> latency sensitive case with HFiles backed by S3.
> Victim handling can be made atomic with respect to the unmapping operation
> with ConcurrentHashMap#computeIfPresent. The upside is there will be no L1+L2
> misses during the transition. The downside is if the victim handler takes a
> long time to execute -- currently they are all very fast, so only a
> theoretical risk -- then other removals or insertions in L1 can block until
> it completes.
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