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https://issues.apache.org/jira/browse/HDFS-10473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15330595#comment-15330595
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Jing Zhao commented on HDFS-10473:
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Thanks for updating the patch, Uma. And thanks for the review, Zhe.
Only updating {{validateAddBlock}} may not be enough. We also need to consider
other scenarios such as the NameNode tries to choose extra datanodes to
reconstruct EC blocks with missing internal blocks (i.e.,
{{ErasureCodingWork#chooseTargets}}). Maybe we can consider adding the extra
check introduced in the current patch directly in
{{INodeFile#getStoragePolicyID}}?
> Allow only suitable storage policies to be set on striped files
> ---------------------------------------------------------------
>
> Key: HDFS-10473
> URL: https://issues.apache.org/jira/browse/HDFS-10473
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Uma Maheswara Rao G
> Assignee: Uma Maheswara Rao G
> Attachments: HDFS-10473-01.patch, HDFS-10473-02.patch,
> HDFS-10473-03.patch
>
>
> Currently some of existing storage policies are not suitable for striped
> layout files.
> This JIRA proposes to reject setting storage policy on striped files.
> Another thought is to allow only suitable storage polices like ALL_SSD.
> Since the major use case of EC is for cold data, this may not be at high
> importance. So, I am ok to reject setting storage policy on striped files at
> this stage. Please suggest if others have some thoughts on this.
> Thanks [~zhz] for offline discussion on this.
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