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https://issues.apache.org/jira/browse/HDFS-12897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16312582#comment-16312582
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Xiao Chen commented on HDFS-12897:
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Thanks for sharing more history [~rakeshr]. I think that's certainly the same
bug in encryption unless [~andrew.wang] says otherwise. The test didn't assert
{{snap2Zone}} either.
In general, IMO the following on the same <subdir> of a snapshottable <dir>
should always respect the snapshot:
# mkdir {{subdir}}
# take snapshot s1 on {{dir}}
# do your thing on {{subdir}}
# take snapshot s2 on {{dir}}
Whatever 'thing' it is on step 3 (ec / ez / acl / xattr / storagepolicy /
perm), {{dir/.snapshot/s1/subdir}} should not have it, and
{{dir/.snapshot/s2/subdir}} should have it.
My guess is in practice there hasn't been many usage this way, so this is only
caught from code review. I propose we fix EC here and file follow-ons for the
others...
> 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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