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https://issues.apache.org/jira/browse/HDFS-7343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15813506#comment-15813506
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Wei Zhou commented on HDFS-7343:
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{quote}
though I'd encourage you to think about how far we can get with a stateless
system (possibly by pushing more work into the NN and DN).
{quote}
>From this words, I myself thought it's better to store these data in NN to
>approach the stateless system suggested by Andrew. I did not mean that Andrew
>said it's better to do it in this way. Sorry for my poor English.
> HDFS smart storage management
> -----------------------------
>
> Key: HDFS-7343
> URL: https://issues.apache.org/jira/browse/HDFS-7343
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Kai Zheng
> Assignee: Wei Zhou
> Attachments: HDFS-Smart-Storage-Management-update.pdf,
> HDFS-Smart-Storage-Management.pdf, move.jpg
>
>
> As discussed in HDFS-7285, it would be better to have a comprehensive and
> flexible storage policy engine considering file attributes, metadata, data
> temperature, storage type, EC codec, available hardware capabilities,
> user/application preference and etc.
> Modified the title for re-purpose.
> We'd extend this effort some bit and aim to work on a comprehensive solution
> to provide smart storage management service in order for convenient,
> intelligent and effective utilizing of erasure coding or replicas, HDFS cache
> facility, HSM offering, and all kinds of tools (balancer, mover, disk
> balancer and so on) in a large cluster.
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