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https://issues.apache.org/jira/browse/HADOOP-16581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16934591#comment-16934591
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Erik Krogen commented on HADOOP-16581:
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Also backported to branch-3.2, branch-3.1, and branch-2. There was a minor
change I needed to make to the test case in branch-2 due to the lack of Java 8
support (removed the lambda, made some parameters final). Thanks [~yuvaldeg]!
> ValueQueue does not trigger an async refill when number of values falls below
> watermark
> ---------------------------------------------------------------------------------------
>
> Key: HADOOP-16581
> URL: https://issues.apache.org/jira/browse/HADOOP-16581
> Project: Hadoop Common
> Issue Type: Bug
> Components: common, kms
> Affects Versions: 2.7.4, 3.2.0
> Reporter: Yuval Degani
> Assignee: Yuval Degani
> Priority: Major
> Fix For: 2.10.0, 3.3.0, 3.1.4, 3.2.2
>
>
> The ValueQueue facility was designed to cache EDEKs for KMS KeyProviders so
> that EDEKs could be served quickly, while the cache is replenished in a
> background thread.
> The existing code for triggering an asynchronous refill is only triggered
> when a key queue becomes empty, rather than when it falls below the
> configured watermark.
> This is a relatively minor fix in the main code, however, most of the tests
> require some changes as they verify the previous unintended behavior.
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