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From "Uma Maheswara Rao G (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-17028) ViewFS should initialize target filesystems lazily
Date Tue, 01 Sep 2020 07:03:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-17028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17188186#comment-17188186
] 

Uma Maheswara Rao G commented on HADOOP-17028:
----------------------------------------------

Thank you [~abhishekd] for the patch. I have this in my list, I will provide my feedback
soon. Thank you.

> 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
>          Time Spent: 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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