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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11221) Have StorageDirectory return Optional<File> instead of File/null
Date Fri, 06 Jan 2017 10:07:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15804183#comment-15804183
] 

Kai Zheng commented on HDFS-11221:
----------------------------------

Thanks Ewan for the confirm and Jiajia for the taking. Just assigned. We're interested in
the overall effort, HDFS supporting external storage.

> Have StorageDirectory return Optional<File> instead of File/null
> ----------------------------------------------------------------
>
>                 Key: HDFS-11221
>                 URL: https://issues.apache.org/jira/browse/HDFS-11221
>             Project: Hadoop HDFS
>          Issue Type: Task
>            Reporter: Ewan Higgs
>            Assignee: Jiajia Li
>            Priority: Minor
>
> In HDFS-10675, {{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 {{nul}}l (if {{StorageDirectory.root}} is null).
> The proposal to handle this is to change the return type of the above functions to {{Optional<File>}}.
According to my preliminary check, this will result in changes in ~70 places, which is why
it's not appropriate to put it in the patch for HDFS-10675. But it is certainly a valuable
fix.



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