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https://issues.apache.org/jira/browse/BOOKKEEPER-301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397380#comment-13397380
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Flavio Junqueira commented on BOOKKEEPER-301:
---------------------------------------------
I haven't read the thread carefully, but I'm guessing that this is due to
losing data in the disk write cache upon a poweroff. Inside Yahoo!, we have
recommended the use of BBWC raid controllers. Another option is to disable the
disk write buffer, but performance is going to drop.
> Chance of Data loss on sudden poweroff
> --------------------------------------
>
> Key: BOOKKEEPER-301
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-301
> Project: Bookkeeper
> Issue Type: Bug
> Components: bookkeeper-server
> Affects Versions: 4.2.0
> Reporter: Uma Maheswara Rao G
> Assignee: Uma Maheswara Rao G
>
> Whatever data Bookie flushed into disk may not be gauranteed that they are
> really pesisted into device. OS will cache the edits. On suddent power off,
> we may loose that edits.
> This is the JIRA to discuss this problem and address the case.
> Hadoop related issue HDFS-1539.
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