Chris Douglas created HDFS-9806:
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Summary: 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
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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