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https://issues.apache.org/jira/browse/HDFS-10675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15706196#comment-15706196
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Virajith Jalaparti commented on HDFS-10675:
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One thing that came up in conversations with [~ehiggs] is that
{{StorageDirectory.root}} can be {{null}} because {{PROVIDED}} storage
locations will not have any directories associated with them. Hence, we need to
add checks to {{StorageDirectory}} to make sure we handle this. This would also
lead to changes in code that call {{StorageDirectory.getRoot}},
{{StorageDirectory.getCurrentDir}}, {{StorageDirectory.getVersionFile}} etc. as
the return value can be {{null}} (if {{StorageDirectory.root}} is {{null}}).
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. Any comments on this? [~ehiggs], [~eddyxu], [~zhz]
> 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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