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https://issues.apache.org/jira/browse/CASSANDRA-8584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14348153#comment-14348153
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Dave Brosius commented on CASSANDRA-8584:
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logback has DuplicateMessageFilter
http://logback.qos.ch/manual/filters.html#DuplicateMessageFilter
but these are exact matches, not just base pattern matches.
> Add strerror output on failed trySkipCache calls
> ------------------------------------------------
>
> Key: CASSANDRA-8584
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8584
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Joshua McKenzie
> Assignee: Joshua McKenzie
> Priority: Trivial
> Fix For: 2.1.4
>
> Attachments: 8584_v1.txt, nospamlogger.txt
>
>
> Since trySkipCache returns an errno rather than -1 and setting errno like our
> other CLibrary calls, it's thread-safe and we could print out more helpful
> information if we failed to prompt the kernel to skip the page cache. That
> system call should always succeed unless we have an invalid fd as it's free
> to ignore us.
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