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https://issues.apache.org/jira/browse/HDFS-3960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487171#comment-13487171
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Sanjay Radia commented on HDFS-3960:
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I assumed that it was an optional parameter.
In append-2 we avoided the extra call to the NN to reduce NN load and reduce
the latency (see the append-2 design doc). BTW in append-2 the new readers
always see the hflushed data correctly - the new reader determine the length of
a file being written by contacting the DN.
> 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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