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https://issues.apache.org/jira/browse/HDFS-9806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15958353#comment-15958353
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Thomas Demoor commented on HDFS-9806:
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We will post an updated design doc next week.
Quick status update:
* General infrastructure, protocol changes and read path are almost done
* Write path and dynamic mounting are ongoing
> Allow HDFS block replicas to be provided by an external storage system
> ----------------------------------------------------------------------
>
> Key: HDFS-9806
> URL: https://issues.apache.org/jira/browse/HDFS-9806
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Chris Douglas
> Attachments: HDFS-9806-design.001.pdf
>
>
> In addition to heterogeneous media, many applications work with heterogeneous
> storage systems. The guarantees and semantics provided by these systems are
> often similar, but not identical to those of
> [HDFS|https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/filesystem/index.html].
> Any client accessing multiple storage systems is responsible for reasoning
> about each system independently, and must propagate/and renew credentials for
> each store.
> Remote stores could be mounted under HDFS. Block locations could be mapped to
> immutable file regions, opaque IDs, or other tokens that represent a
> consistent view of the data. While correctness for arbitrary operations
> requires careful coordination between stores, in practice we can provide
> workable semantics with weaker guarantees.
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