[jira] [Commented] (HADOOP-17028) ViewFS should initialize target filesystems lazily

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-17028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18040931#comment-18040931 ] 

ASF GitHub Bot commented on HADOOP-17028:
-----------------------------------------

github-actions[bot] commented on PR #3218:
URL: https://github.com/apache/hadoop/pull/3218#issuecomment-3583629063

   We're closing this stale PR because it has been open for 100 days with no activity. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
   If you feel like this was a mistake, or you would like to continue working on it, please feel free to re-open it and ask for a committer to remove the stale tag and review again.
   Thanks all for your contribution.




> ViewFS should initialize target filesystems lazily
> --------------------------------------------------
>
>                 Key: HADOOP-17028
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17028
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: client-mounts, fs, viewfs
>    Affects Versions: 3.2.1
>            Reporter: Uma Maheswara Rao G
>            Assignee: Abhishek Das
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.4.0, 2.10.2, 3.2.3, 3.3.2, 3.1.5
>
>          Time Spent: 7h 50m
>  Remaining Estimate: 0h
>
> Currently viewFS initialize all configured target filesystems when viewfs#init itself.
> Some target file system initialization involve creating heavy objects and proxy connections. Ex: DistributedFileSystem#initialize will create DFSClient object which will create proxy connections to NN etc.
> For example: if ViewFS configured with 10 target fs with hdfs uri and 2 targets with s3a.
> If one of the client only work with s3a target, But ViewFS will initialize all targets irrespective of what clients interested to work with. That means, here client will create 10 DFS initializations and 2 s3a initializations. Its unnecessary to have DFS initialization here. So, it will be a good idea to initialize the target fs only when first time usage call come to particular target fs scheme. 



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