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From "Elek, Marton (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-13074) Ozone File System
Date Tue, 07 Aug 2018 07:51:01 GMT

     [ https://issues.apache.org/jira/browse/HDFS-13074?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Elek, Marton resolved HDFS-13074.
    Resolution: Fixed

Resolving as all of the sub jiras are resolved.

> Ozone File System
> -----------------
>                 Key: HDFS-13074
>                 URL: https://issues.apache.org/jira/browse/HDFS-13074
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: hdfs
>            Reporter: Jitendra Nath Pandey
>            Assignee: Jitendra Nath Pandey
>            Priority: Major
> This jira splits out the Ozone's Key Value namespace out of HDFS-7240, leaving that jira
to focus on the block layer Hadoop Distributed Storage Layer (HDSL).  HDFS-10419 focuses
on the traditional hierarchical namespace/NN on top of HDFS while this jira focuses on a flat
Key-Value namespace call ed Ozone FS on top HDSL. 
> [~owen.omalley] suggested the split in HDFS-7240 in this comment.
> Ozone provides two APIs:
>  * A KV API
>  * A Hadoop compatible FS (Haddop FileSystem and Hadoop FileContext), on top of KV API.
> Ozone FS serves the following purpose
>  * It helps test the new storage layer (HDSL)
>  * It can be directly used by applications (such. Hive, Spark)  that are ready for cloud's
native storage systems that use a KV namespace such as S3, Azure ADLS.
> Ozone's namespace server scales well because of following reasons:
>  * It keeps only the working set of metadata in memory - this scales the Key-Value namespace.
>  * Ozone does not need to keep the equivalent of the block-map; instead the corresponding
container-to-location mapping resides in in the SCM - this leaves additional free space for
caching the metadata. This benefit is also available to NN that adapts to the new block-storage
container layer as explained in Evolving NN using new block container layer attached in HDFS-10419.
>  * It does not have a single global lock - this will scale well against a large number
of concurrent clients/rpcs. 
>  * It can be partitioned/sharded much more easily because it is a flat namespace. Indeed
a natural partitioning level is the bucket. Partitioning would further scale the number of
clients/rpcs and also the Key-value namespace.

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