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https://issues.apache.org/jira/browse/HDFS-15714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17444528#comment-17444528
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Bhavik Patel commented on HDFS-15714:
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[~PhiloHe] Thanks for the fix.
I think now we have to try to merge this changes into trunk branch so everyone
will use this feature and if they found any issue they will also contribute.
Also one can start updating Apache doc with the feature details.
> HDFS Provided Storage Read/Write Mount Support On-the-fly
> ---------------------------------------------------------
>
> Key: HDFS-15714
> URL: https://issues.apache.org/jira/browse/HDFS-15714
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode, namenode
> Affects Versions: 3.4.0
> Reporter: Feilong He
> Assignee: Feilong He
> Priority: Major
> Labels: pull-request-available
> Attachments: HDFS-15714-01.patch, HDFS-15714-02.patch,
> HDFS_Provided_Storage_Design-V1.pdf, HDFS_Provided_Storage_Performance-V1.pdf
>
> Time Spent: 2.5h
> Remaining Estimate: 0h
>
> HDFS Provided Storage (PS) is a feature to tier HDFS over other file systems.
> In HDFS-9806, PROVIDED storage type was introduced to HDFS. Through
> configuring external storage with PROVIDED tag for DataNode, user can enable
> application to access data stored externally from HDFS side. However, there
> are two issues need to be addressed. Firstly, mounting external storage
> on-the-fly, namely dynamic mount, is lacking. It is necessary to get it
> supported to flexibly combine HDFS with an external storage at runtime.
> Secondly, PS write is not supported by current HDFS. But in real
> applications, it is common to transfer data bi-directionally for read/write
> between HDFS and external storage.
> Through this JIRA, we are presenting our work for PS write support and
> dynamic mount support for both read & write. Please note in the community
> several JIRAs have been filed for these topics. Our work is based on these
> previous community work, with new design & implementation to support called
> writeBack mount and enable admin to add any mount on-the-fly. We appreciate
> those folks in the community for their great contribution! See their pending
> JIRAs: HDFS-14805 & HDFS-12090.
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