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https://issues.apache.org/jira/browse/HDFS-3431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13277255#comment-13277255
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Colin Patrick McCabe commented on HDFS-3431:
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We should also implement ftruncate in the FUSE client, so that currently open
files can be truncated properly. Perhaps there should be a JIRA for this?
> Improve fuse-dfs truncate
> -------------------------
>
> Key: HDFS-3431
> URL: https://issues.apache.org/jira/browse/HDFS-3431
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: contrib/fuse-dfs
> Reporter: Eli Collins
> Priority: Minor
>
> Fuse-dfs truncate only works for size == 0 and per the function's comment is
> a "Weak implementation in that we just delete the file and then re-create it,
> but don't set the user, group, and times to the old file's metadata". Per
> HDFS-860 we should ENOTSUP when the size != 0 or the size of the file.
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