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https://issues.apache.org/jira/browse/HDFS-15614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17325352#comment-17325352
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Arpit Agarwal commented on HDFS-15614:
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bq. , if providing an external command to create the Trash directory by admins
is feasible and makes sense
The external command will add more friction to enabling the feature. We want it
to be transparent as far as possible. I like the option to auto create the
.Trash dir better.
> Initialize snapshot trash root during NameNode startup if enabled
> -----------------------------------------------------------------
>
> Key: HDFS-15614
> URL: https://issues.apache.org/jira/browse/HDFS-15614
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Siyao Meng
> Assignee: Siyao Meng
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> This is a follow-up to HDFS-15607.
> Goal:
> Initialize (create) snapshot trash root for all existing snapshottable
> directories if {{dfs.namenode.snapshot.trashroot.enabled}} is set to
> {{true}}. So admins won't have to run {{dfsadmin -provisionTrash}} manually
> on all those existing snapshottable directories.
> The change is expected to land in {{FSNamesystem}}.
> Discussion:
> 1. Currently in HDFS-15607, the snapshot trash root creation logic is on the
> client side. But in order for NN to create it at startup, the logic must
> (also) be implemented on the server side as well. -- which is also a
> requirement by WebHDFS (HDFS-15612).
> 2. Alternatively, we can provide an extra parameter to the
> {{-provisionTrash}} command like: {{dfsadmin -provisionTrash -all}} to
> initialize/provision trash root on all existing snapshottable dirs.
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