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https://issues.apache.org/jira/browse/HDFS-12000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16076819#comment-16076819
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Yiqun Lin commented on HDFS-12000:
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Hi [~cheersyang], thanks for the desgin doc for the oznoe key versioning
support. It looks really good. Just some comments from me:
If Ozone support multiple key versions, I think how to manager different key
version datas should be a major problem we should deal with. The multiple key
versions mean that we will store a lot of datas in ozone. Actually we don't
really need to store some file datas every time users put in ozone when key
version is enabled. A better way is that only when we detect the change between
current key data and uploaded file, then we put this file. Otherwise we can
just update the reference info, generate a new key version, but the actual data
is current file. This is a little similar to HDFS snapshot. This way can save
some spaces for ozone.
I have a different opition on the way of deleteing key versions when switch
enable multiple version to disabled state. I think it will still be a hard work
for KSM to delete all the version keys/files even we use a async way. How about
using an expire policy for old key versions as that have mentioned in the doc?
This should be a good way for this case.
Finally, I have a question: if we need to complete this work in the first phase
work of Ozone? I am just curious of this. This feature looks realy usefule for
the users. But seems this should need some more work for complte this. There
will be lots of places to have a adjustment for supporting mutilple key
versions.
> Ozone: Container : Add key versioning support
> ---------------------------------------------
>
> Key: HDFS-12000
> URL: https://issues.apache.org/jira/browse/HDFS-12000
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
> Affects Versions: HDFS-7240
> Reporter: Anu Engineer
> Assignee: Chen Liang
>
> The rest interface of ozone supports versioning of keys. This support comes
> from the containers and how chunks are managed to support this feature. This
> JIRA tracks that feature. Will post a detailed design doc so that we can talk
> about this feature.
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