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https://issues.apache.org/jira/browse/HDFS-12897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16310725#comment-16310725
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Xiao Chen commented on HDFS-12897:
----------------------------------
Thanks [~GeLiXin] for the continued investigation into this.
bq. What's the supposed, right behavior?
{{TestErasureCodingPolicyWithSnapshot#testSnapshotsOnErasureCodingDirsParentDir}}
was added by HDFS-8777. Ping [~rakeshr] [~zhz] [~jingzhao], was this
intentional or was this a miss? I didn't see any discussions about the behavior
in that jira.
IMO the existing test is wrong:
{code}
...
fs.setErasureCodingPolicy(ecDir, ecPolicy.getName());
final Path snap1 = fs.createSnapshot(ecDirParent, "snap1");
assertEquals("Got unexpected erasure coding policy", ecPolicy,
fs.getErasureCodingPolicy(snap1ECDir));
...
fs.delete(ecDir, true);
fs.mkdir(ecDir, FsPermission.getDirDefault());
final Path snap2 = fs.createSnapshot(ecDirParent, "snap2");
assertNull("Expected null erasure coding policy",
fs.getErasureCodingPolicy(snap2ECDir));
...
fs.setErasureCodingPolicy(ecDir, ecPolicy.getName());
final Path snap3 = fs.createSnapshot(ecDirParent, "snap3");
assertEquals("Got unexpected erasure coding policy", ecPolicy, ezSnap3);
...
assertEquals("Got unexpected erasure coding policy", ecPolicy,
fs.getErasureCodingPolicy(snap1ECDir));
assertEquals("Got unexpected erasure coding policy", ecPolicy,
fs.getErasureCodingPolicy(snap2ECDir)); // <-- shouldn't this be null?
{code}
> 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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