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https://issues.apache.org/jira/browse/HDFS-10675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15716167#comment-15716167
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Ewan Higgs commented on HDFS-10675:
-----------------------------------

{quote}
The proposal to handle this is to change the return type of the above functions 
to Optional<File>. This will lead to changes in a lot of other places but will 
make it explicit that the return value can be null. I propose to open a new 
JIRA for this.
{quote}

Hi [~virajith]. I think this makes sense as it keeps the patches specific to 
the thing they are trying to solve. Would you like to create the ticket under 
HDFS-9806?

> Datanode support to read from external stores. 
> -----------------------------------------------
>
>                 Key: HDFS-10675
>                 URL: https://issues.apache.org/jira/browse/HDFS-10675
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Virajith Jalaparti
>         Attachments: HDFS-10675-HDFS-9806.001.patch, 
> HDFS-10675-HDFS-9806.002.patch, HDFS-10675-HDFS-9806.003.patch
>
>
> This JIRA introduces a new {{PROVIDED}} {{StorageType}} to represent external 
> stores, along with enabling the Datanode to read from such stores using a 
> {{ProvidedReplica}} and a {{ProvidedVolume}}.



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