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https://issues.apache.org/jira/browse/HDFS-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13503323#comment-13503323
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Todd Lipcon commented on HDFS-4213:
-----------------------------------
Backport? I thought the purpose for this was for snapshot consistency? Given
that snapshots are targeted at trunk (3.0) I don't see any plausible way it
could be backported to branch-1.
> When the client calls hsync(), allows the client to update the file length in
> the NameNode
> ------------------------------------------------------------------------------------------
>
> Key: HDFS-4213
> URL: https://issues.apache.org/jira/browse/HDFS-4213
> Project: Hadoop HDFS
> Issue Type: New Feature
> Affects Versions: 3.0.0
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Attachments: HDFS-4213.001.patch, HDFS-4213.002.patch,
> HDFS-4213.003.patch
>
>
> As per discussion in HDFS-3960 and HDFS-2802, when clients that need strong
> consistency update the file length at the NameNode, a special sync is
> required for getting the length of the being written files when snapshots are
> taken for these files. This jira implements this sync-with-updating-length by
> 1) calling ClientProtocol#fsync(), and 2) adding a new field to
> ClientProtocol#fsync() to indicate the length information.
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