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https://issues.apache.org/jira/browse/BOOKKEEPER-301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397402#comment-13397402
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Uma Maheswara Rao G commented on BOOKKEEPER-301:
------------------------------------------------
Yes, Falvio. You are right.
In Hadoop, handled like below.
called FileChannel#force after flush.
{code}
+ ((FileOutputStream)out).getChannel().force(true);
{code}
This is an optional. Who ever wants, they can enable it.
> 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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