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https://issues.apache.org/jira/browse/HBASE-28364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17864066#comment-17864066
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Nikita Pande commented on HBASE-28364:
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*+1 for this*
I have observed this too as *WARN* "hfile.CombinedBlockCache: Cache key <> had
block type null, but was found in L1 cache."
Also another observation is, I have enabled L2 cache, but the logs say "but was
found in L1 cache."
> Warn: Cache key had block type null, but was found in L1 cache
> --------------------------------------------------------------
>
> Key: HBASE-28364
> URL: https://issues.apache.org/jira/browse/HBASE-28364
> Project: HBase
> Issue Type: Bug
> Reporter: Bryan Beaudreault
> Priority: Major
>
> I'm ITBLL testing branch-2.6 and am seeing lots of these warns. This is new
> to me. I would expect a warn to be on the rare side or be indicative of a
> problem, but unclear from the code.
> cc [~wchevreuil]
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