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https://issues.apache.org/jira/browse/HDFS-3960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487033#comment-13487033
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Konstantin Shvachko commented on HDFS-3960:
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The document proposes to add new functionality as far as I understand. I just
propose to add a parameter to fsync(). Because sync can and should adjust file
length, just like close. The client is the only authority that knows the exact
file length.
That way snapshots should rely on the length of a file held by the NameNode
instead of obtaining it from DataNodes.
I don't think files that were not hflush-ed should be excluded from snapshots
as the document proposes. Everything should be versioned.
> Snapshot of Being Written Files
> -------------------------------
>
> Key: HDFS-3960
> URL: https://issues.apache.org/jira/browse/HDFS-3960
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
>
> Here is a design question: Suppose there is a being written file when a
> snapshot is being taken. What should the length of the file be shown in the
> snapshot? In other words, how to determine the length of being written file
> when a snapshot is being taken?
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