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https://issues.apache.org/jira/browse/BOOKKEEPER-429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13809996#comment-13809996
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Rakesh R commented on BOOKKEEPER-429:
-------------------------------------
Please find the below trace which I've seen from the jenkins report.
https://builds.apache.org/job/bookkeeper-trunk-precommit-build/526/testReport/junit/org.apache.bookkeeper.client/SlowBookieTest/testSlowBookie/
{code}
java.lang.IllegalArgumentException
at
java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:589)
at
java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:514)
at java.util.concurrent.Executors.newFixedThreadPool(Executors.java:84)
at org.apache.bookkeeper.bookie.Journal.<init>(Journal.java:493)
at org.apache.bookkeeper.bookie.Bookie.<init>(Bookie.java:422)
at
org.apache.bookkeeper.proto.BookieServer.newBookie(BookieServer.java:87)
at org.apache.bookkeeper.proto.BookieServer.<init>(BookieServer.java:76)
{code}
> Provide separate read and write threads in the bookkeeper server
> ----------------------------------------------------------------
>
> Key: BOOKKEEPER-429
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-429
> Project: Bookkeeper
> Issue Type: Improvement
> Components: bookkeeper-server
> Affects Versions: 4.2.0
> Reporter: Aniruddha
> Assignee: Aniruddha
> Fix For: 4.3.0
>
> Attachments:
> 0001-BOOKKEEPER-429-Provide-separate-read-and-write-threa.patch,
> BK-429.patch, BOOKKEEPER-429.diff, BOOKKEEPER-429.diff
>
>
> The current bookkeeper server is single threaded. The same thread handles
> reads and writes. When reads are slow (possibly because of excessive seeks),
> add entry operations suffer in terms of latencies. Providing separate read
> and write threads helps in reducing add entry latencies and increasing
> throughput even when we're facing slow reads. Having a single read thread
> also results in low disk utilization because seeks can't be ordered
> efficiently by the OS. Multiple read threads would help in improving the read
> throughput.
> Discussion on this can be found at
> http://mail-archives.apache.org/mod_mbox/zookeeper-bookkeeper-dev/201209.mbox/%3ccaolhydqpzn-v10zynfwud_h0qzrxtmjgttx7a9eofohyyty...@mail.gmail.com%3e
> Reviewboard : https://reviews.apache.org/r/7560/
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