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From "Ewan Higgs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10675) Datanode support to read from external stores.
Date Fri, 02 Dec 2016 20:16:58 GMT

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

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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