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https://issues.apache.org/jira/browse/HBASE-28364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17864160#comment-17864160
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Wellington Chevreuil commented on HBASE-28364:
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{quote}
Also another observation is, I have enabled L2 cache, but the logs say "but was
found in L1 cache."
{quote}
Even with L2 enabled, meta blocks would still be placed in L1, so L1 is checked.
{quote}
Wellington Chevreuil can I work on reverting the log?
{quote}
Sure. This would only be needed in branch-2.6 downwards, as I already removed
this as part of HBASE-28596 changes, which went to master, branch-3 and
branch-2.
> 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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