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https://issues.apache.org/jira/browse/HDFS-15025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17202543#comment-17202543
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Mingliang Liu edited comment on HDFS-15025 at 9/26/20, 8:03 AM:
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[~ayushsaxena] Yes if FSImage depends on the ordinal, we should keep all
existing ones’ ordinal and update the comment in code since the order is not
from fast to slow any more. I don’t intend to support for breaking any FSImage
compatibility in Hadoop 3. This is a really good point. We should fix this. Not
sure if revert and recommit is better, but a follow up change is also fine to
me considering this is never released. Thanks!
Given this was omitted originally, [~wangyayun] how about some manual test with
old FSImage and new code?
-I just noticed this JIRA's release notes do not include how to use this
feature.-
CC [~brahma]
was (Author: liuml07):
[~ayushsaxena] Yes if FSImage depends on the ordinal, we should keep all
existing ones’ ordinal and update the comment in code since the order is not
from fast to slow any more. I don’t intend to support for breaking any FSImage
compatibility in Hadoop 3. This is a really good point. We should fix this. Not
sure if revert and recommit is better, but a follow up change is also fine to
me considering this is never released. Thanks!
Given this was omitted originally, [~wangyayun] how about some manual test
with old FSImage and new code?
I just noticed this JIRA has no release notes. Please add one [~wangyayun] CC
[~brahma]
> 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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