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https://issues.apache.org/jira/browse/HDFS-4750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13641379#comment-13641379
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Brandon Li commented on HDFS-4750:
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Hi Brock, I was about to send you the link to this JIRA. Glad you already
noticed it.
I've resolved HDFS-252 as a dup.
I studied your NFSv4 implementation and learned a lot from it. Thank you! :-)
"10 milliseconds" is the time from the reference paper. In the initial
implementation, we used 10 seconds just to be on the safe side.
Regarding small file append, it starts from the correct offset in the tests I
observed. For example, I tried "echo abcd >> /mnt_test/file_with_5bytes", the
write request starts with offset 5. With the initial file loading tests with
Linux/Mac clients, so far we haven't encountered the problem you mentioned.
For the second question, as long as the second user uses NFS gateway to read
the closed file, the second user should be able to get the data buffered in NFS
gateway. For the opened files, NFS gateway also saves their latest file size.
When it serves getattr request, it gets file attributes from HDFS and then
update the file length based on the cached length.
Thanks!
Brandon
> Support NFSv3 interface to HDFS
> -------------------------------
>
> Key: HDFS-4750
> URL: https://issues.apache.org/jira/browse/HDFS-4750
> Project: Hadoop HDFS
> Issue Type: New Feature
> Affects Versions: 3.0.0
> Reporter: Brandon Li
> Assignee: Brandon Li
> Attachments: HADOOP-NFS-Proposal.pdf
>
>
> Access HDFS is usually done through HDFS Client or webHDFS. Lack of seamless
> integration with client’s file system makes it difficult for users and
> impossible for some applications to access HDFS. NFS interface support is one
> way for HDFS to support such easy integration.
> This JIRA is to track the NFS protocol support for accessing HDFS. With HDFS
> client, webHDFS and the NFS interface, HDFS will be easier to access and be
> able support more applications and use cases.
> We will upload the design document and the initial implementation.
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