LiXin Ge created HDFS-13021:
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Summary: Incorrect storage policy of snapshott file was returned
by getStoragePolicy command
Key: HDFS-13021
URL: https://issues.apache.org/jira/browse/HDFS-13021
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs, snapshots
Affects Versions: 3.1.0
Reporter: LiXin Ge
Assignee: LiXin Ge
Snapshots are supposed to be immutable and read only, so the file status which
in a snapshot path shouldn't follow the original file's change.
The StoragePolicy in snapshot situation acts like a bug now.
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Reproduction：Operation on snapshottable dir {{/storagePolicy}}
*before make snapshot:*
{code:java}
[bin]# hdfs storagepolicies -setStoragePolicy -path /storagePolicy -policy
PROVIDED
Set storage policy PROVIDED on /storagePolicy
[bin]# hadoop fs -put /home/file /storagePolicy/file_PROVIDED
[bin]# hdfs storagepolicies -getStoragePolicy -path
/storagePolicy/file_PROVIDED
The storage policy of /storagePolicy/file_PROVIDED:
BlockStoragePolicy{HOT:7, storageTypes=[DISK], creationFallbacks=[],
replicationFallbacks=[ARCHIVE]}
{code}
*make snapshot and check:*
{code:java}
[bin]# hdfs dfs -createSnapshot /storagePolicy s3_PROVIDED
Created snapshot /storagePolicy/.snapshot/s3_PROVIDED
[bin]# hdfs storagepolicies -getStoragePolicy -path
/storagePolicy/.snapshot/s3_PROVIDED/file_PROVIDED
The storage policy of /storagePolicy/.snapshot/s3_PROVIDED/file_PROVIDED:
BlockStoragePolicy{PROVIDED:1, storageTypes=[PROVIDED, DISK],
creationFallbacks=[PROVIDED, DISK], replicationFallbacks=[PROVIDED, DISK]}
{code}
*change the StroagePolicy and check again:*
{code:java}
[bin]# hdfs storagepolicies -setStoragePolicy -path /storagePolicy -policy HOT
Set storage policy HOT on /storagePolicy
[bin]# hdfs storagepolicies -getStoragePolicy -path
/storagePolicy/.snapshot/s3_PROVIDED/file_PROVIDED
The storage policy of /storagePolicy/.snapshot/s3_PROVIDED/file_PROVIDED:
BlockStoragePolicy{HOT:7, storageTypes=[DISK], creationFallbacks=[],
replicationFallbacks=[ARCHIVE]} ---- It shouldn't be HOT
{code}
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