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https://issues.apache.org/jira/browse/HDFS-12897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16310591#comment-16310591
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LiXin Ge commented on HDFS-12897:
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Hi [~xiaochen], Thanks for your new suggestions, I'm done on my local branch,
and It's no problem for me to create a new issue to work on the
{{StoragePolicy}} error you mentioned.
But I have a bit of confusion on the new issue. Since snapshots are supposed to
be immutable and read only, the appearance seems reasonable now:
bq. getPolicy on s1 should say RS(6,3), and on s2 should say RS(3,2).
The 1-liner change seems exactly correct to get the specified snapshot, but
after this 1-liner change take effect, the appearance changes from older
snapshots still have the old EC Policy to older snapshots have NULL EC Policy
now, and some exist unit test like
{{testSnapshotsOnErasureCodingDirsParentDir}} fails.
What's the supposed, right behavior?
> Path not found when we get the ec policy for a .snapshot dir
> ------------------------------------------------------------
>
> Key: HDFS-12897
> URL: https://issues.apache.org/jira/browse/HDFS-12897
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: erasure-coding, hdfs, snapshots
> Affects Versions: 3.0.0-alpha1, 3.1.0
> Reporter: Harshakiran Reddy
> Assignee: LiXin Ge
> Attachments: HDFS-12897.001.patch, HDFS-12897.002.patch,
> HDFS-12897.003.patch
>
>
> Scenario:-
> ---------------
> Operation on snapshot dir.
> *EC policy*
> bin> ./hdfs ec -getPolicy -path /dir/
> RS-3-2-1024k
> bin> ./hdfs ec -getPolicy -path /dir/.snapshot/
> {{FileNotFoundException: Path not found: /dir/.snapshot}}
> bin> ./hdfs dfs -ls /dir/.snapshot/
> Found 2 items
> drwxr-xr-x - user group 0 2017-12-05 12:27 /dir/.snapshot/s1
> drwxr-xr-x - user group 0 2017-12-05 12:28 /dir/.snapshot/s2
> *Storagepolicies*
> bin> ./hdfs storagepolicies -getStoragePolicy -path /dir/.snapshot/
> {{The storage policy of /dir/.snapshot/ is unspecified}}
> bin> ./hdfs storagepolicies -getStoragePolicy -path /dir/
> The storage policy of /dir/:
> BlockStoragePolicy{COLD:2, storageTypes=[ARCHIVE], creationFallbacks=[],
> replicationFallbacks=[]}
> *Which is the correct behavior ?*
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