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https://issues.apache.org/jira/browse/BOOKKEEPER-336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13483042#comment-13483042
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Rakesh R commented on BOOKKEEPER-336:
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Thanks Ivan, Stud for the participation. I also agree to go with read timeouts.
I could see the parallel read to quorum bookies would make the bkserver
busy/exhaust with many read requests and may affect the write latency in worst
case. But good thing is, we have BOOKKEEPER-429 idea of separate read/write
threads, this would help us in latency and IMO this issue also go together.
> 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
> Attachments: BOOKKEEPER-336.1.patch, BOOKKEEPER-336.draft1.diff,
> BOOKKEEPER-336.patch
>
>
> 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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