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From "Virajith Jalaparti (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9806) Allow HDFS block replicas to be provided by an external storage system
Date Wed, 05 Jul 2017 17:43:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9806?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Virajith Jalaparti updated HDFS-9806:
-------------------------------------
    Attachment: HDFS-9806-design.002.pdf

> 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, HDFS-9806-design.002.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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