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https://issues.apache.org/jira/browse/HDFS-13838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16606194#comment-16606194
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Siyao Meng commented on HDFS-13838:
-----------------------------------
[~jojochuang]
1&2. So far in the trunk, the only reference to the JSON key "snapshotEnabled"
is in the JsonUtil.java. Since the same key in HttpFS is "seBit"
(HttpFSFileSystem.java:202), the cleanest way to do this is by changing
"snapshotEnabled" in WebHDFS to "seBit", since the naming convention for other
properties are "aclBit", "encBit", "ecBit". Indeed there is a workaround, that
is to have both "seBit" AND "snapshotEnabled" and somehow mark the latter as
deprecated. Would this satisfy the compatibility requirement?
3. Okay. Do I submit the doc change and code change in one patch?
> WebHdfsFileSystem.getFileStatus() won't return correct "snapshot enabled"
> status
> --------------------------------------------------------------------------------
>
> Key: HDFS-13838
> URL: https://issues.apache.org/jira/browse/HDFS-13838
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs, webhdfs
> Affects Versions: 3.1.0, 3.0.3
> Reporter: Siyao Meng
> Assignee: Siyao Meng
> Priority: Major
> Attachments: HDFS-13838.001.patch, HDFS-13838.002.patch,
> HDFS-13838.003.patch
>
>
> "Snapshot enabled" status has been added in HDFS-12455 by [~ajaykumar].
> However, it is found by [~jojochuang] that WebHdfsFileSystem.getFileStatus()
> won't return the correct "snapshot enabled" status. The reason is that
> JsonUtilClient.toFileStatus() did not check and append the "snapshot enabled"
> flag to the resulting HdfsFileStatus object.
> Proof:
> In TestWebHDFS#testWebHdfsAllowandDisallowSnapshots(), add the following
> lines indicated by prepending "+":
> {code:java}
> // allow snapshots on /bar using webhdfs
> webHdfs.allowSnapshot(bar);
> +// check if snapshot status is enabled
> +assertTrue(dfs.getFileStatus(bar).isSnapshotEnabled());
> +assertTrue(webHdfs.getFileStatus(bar).isSnapshotEnabled());
> {code}
> The first assertion will pass, as expected, while the second assertion will
> fail because of the reason above.
> Update:
> A further investigation shows that FSOperations.toJsonInner() also doesn't
> check the "snapshot enabled" bit. Therefore,
> "fs.getFileStatus(path).isSnapshotEnabled()" will always return false for fs
> type HttpFSFileSystem/WebHdfsFileSystem/SWebhdfsFileSystem. This will be
> addressed in a separate jira HDFS-13886.
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