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https://issues.apache.org/jira/browse/HDFS-15025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17202568#comment-17202568
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Ayush Saxena commented on HDFS-15025:
-------------------------------------
Thanx [~liuml07] for checking, Usually I don't favour reverting if things can
be fixed and the contributor is active and ready to fix. I think we can just
reopen and have an addendum patch.
[~wangyayun] I guess you need to handle {{downgrade}} scenario as well, You
shouldn't allow setting quota for {{NVDIMM}}, unless upgrade is finalised. Else
on downgrade you will face issues? Give a check to {{NamenodeLayoutVersion}}.
Please reopen this and provide an addendum fix above your changes. If you get
stuck somewhere or have any doubts on this stuff, feel free to ask..
> Applying NVDIMM storage media to HDFS
> -------------------------------------
>
> Key: HDFS-15025
> URL: https://issues.apache.org/jira/browse/HDFS-15025
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode, hdfs
> Reporter: YaYun Wang
> Assignee: YaYun Wang
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Attachments: Applying NVDIMM to HDFS.pdf, HDFS-15025.001.patch,
> HDFS-15025.002.patch, HDFS-15025.003.patch, HDFS-15025.004.patch,
> HDFS-15025.005.patch, HDFS-15025.006.patch, NVDIMM_patch(WIP).patch
>
> Time Spent: 12h 10m
> Remaining Estimate: 0h
>
> The non-volatile memory NVDIMM is faster than SSD, it can be used
> simultaneously with RAM, DISK, SSD. The data of HDFS stored directly on
> NVDIMM can not only improves the response rate of HDFS, but also ensure the
> reliability of the data.
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