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https://issues.apache.org/jira/browse/BOOKKEEPER-336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13411281#comment-13411281
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Uma Maheswara Rao G commented on BOOKKEEPER-336:
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Flavio's reply in mailing list about this issue:
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I'm not sure blacklisting is a good idea, the bookie could be simply a little
slow at that point for whatever reason. It might be a better idea to have a
separate timeout for reads. We send read requests to the quorum sequentially to
optimize the use bandwidth, but it is clear that slow/dead bookies can hurt
performance. We have essentially optimized for what we believed to be the
common case.
-Flavio
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> bookie readEntries is taking more time if the ensemble has failed bookie(s)
> ---------------------------------------------------------------------------
>
> Key: BOOKKEEPER-336
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-336
> Project: Bookkeeper
> Issue Type: Bug
> Affects Versions: 4.1.0
> Reporter: Brahma Reddy Battula
> Assignee: Rakesh R
>
> Scenario:
> 1) Start three bookies. Create ledger with ensemblesize=3, quorumsize=2
> 2) Add 100 entries to this ledger
> 3) Make first bookie down and read the entries from 0-99
> Output: Each entry is going to fetch from the failed bookie and is waiting
> for the bookie connection timeout, only after failure going to next bookie.
> This is affecting the read entry performance.
> Impact: Namenode switching time will be affected by adding this failed bookie
> readTimeOut also.
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