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https://issues.apache.org/jira/browse/HBASE-20665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16504835#comment-16504835
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Josh Elser commented on HBASE-20665:
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For clarity on why this was being "refixed":
* HBASE-20447 is what originally added this log message at debug
* 2.x and master seem to have different version of HBASE-20447 which has this
message at warn
* 1.4 and 1.5 have the log message at debug (thus we don't need this change on
those branches)
* 1.3 has HBASE-20447 and needs this change
* 1.2 does not have HBASE-20447 but still needs this change
> "Already cached block XXX" message should be DEBUG
> --------------------------------------------------
>
> Key: HBASE-20665
> URL: https://issues.apache.org/jira/browse/HBASE-20665
> Project: HBase
> Issue Type: Task
> Components: BlockCache
> Affects Versions: 1.2.0, 2.0.0
> Reporter: Sean Busbey
> Assignee: Eric Maynard
> Priority: Minor
> Labels: beginner
> Fix For: 3.0.0, 2.1.0, 1.2.7, 1.3.3
>
> Attachments: HBASE-20665.master.001.patch,
> HBASE-20665.master.001.patch
>
>
> Testing a local cluster that relies on the LruBlockCache for a scan-heavy
> workload and I'm getting a bunch of log entries at WARN
> {code}
> 2018-05-30 12:28:47,192 WARN org.apache.hadoop.hbase.io.hfile.LruBlockCache:
> Cached an already cached block: df01f5bf6a244f6bb1a626b927377fff_54780812
> cb:df01f5bf6a244f6bb1a626b927377fff_54780812. This is harmless and can happen
> in rare cases (see HBASE-8547)
> {code}
> As the log message notes (and the code confirms) this is a harmless result of
> contention for getting a block into the CHM. the message should be at DEBUG.
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