Jing Zhao created HDFS-6969:
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Summary: Archival Storage: INode#getStoragePolicyID should always
return the latest storage policy
Key: HDFS-6969
URL: https://issues.apache.org/jira/browse/HDFS-6969
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Jing Zhao
Assignee: Jing Zhao
In general, every file should only provide exact one storage policy for the
Mover, no matter its snapshot states. Suppose a file /foo/bar, and it is
contained in snapshots s1 and s2 of the root. If /foo/bar,
/.snapshot/s1/foo/bar and /.snapshot/s2/foo/bar have different storage
policies, when running Mover, we have to select one of the storage policies,
among which the latest one should be the best. And if /foo/bar is deleted, we
should still use its storage policy before the deletion, since the file
deletion should not trigger data migration.
Thus maybe what we can do is:
1. For a file with policy directly specified on it, alway follow the latest
2. Otherwise follow its latest parental path to identify its storage policy
(simply following the parent link)
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