Siyao Meng created HDFS-15614:
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Summary: 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: Improvement
Reporter: Siyao Meng
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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