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https://issues.apache.org/jira/browse/HDFS-5774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13876930#comment-13876930
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Colin Patrick McCabe commented on HDFS-5774:
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Maybe I'm missing something, but I don't see how making these fields optional
improves compatibility. We can't construct the cache manager without these
fields, and there are no older versions of the software that didn't have them.
> Serialize CachePool directives in protobuf
> ------------------------------------------
>
> Key: HDFS-5774
> URL: https://issues.apache.org/jira/browse/HDFS-5774
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Haohui Mai
> Assignee: Haohui Mai
> Attachments: HDFS-5774.000.patch, HDFS-5774.001.patch
>
>
> This jira proposes to implement serialize cache pool directives in protobuf.
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