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https://issues.apache.org/jira/browse/HADOOP-17072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17139993#comment-17139993
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Uma Maheswara Rao G commented on HADOOP-17072:
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Hi [~virajith] , thanks for filing and the patch!
I looked at patch quickly. We have two closely similar functionality APIs which
are publicly exposed in FileSystem.java currently.
1) public Path getLinkTarget(Path f) throws IOException {
2) public FileSystem[] getChildFileSystems() {
Did you get chance to check them in ur use case without adding new APIs?
I see that in getClusterRoots, you are already using getChildFileSystems.
You added FileSystem#getRootURI. This seems to me a simple util method, need
not be in FileSystem.java? Is your plan actually to override getRootURI in
specific fileSystems?
The current implementation in ViewFileSystem#getClusterRoots can be done in any
util class as well by using public getChildFileSystems? Could you please
elaborate a bit?
> Add getClusterRoot and getClusterRoots methods to FileSystem and
> ViewFilesystem
> -------------------------------------------------------------------------------
>
> Key: HADOOP-17072
> URL: https://issues.apache.org/jira/browse/HADOOP-17072
> Project: Hadoop Common
> Issue Type: Task
> Components: fs, viewfs
> Reporter: Virajith Jalaparti
> Assignee: Virajith Jalaparti
> Priority: Major
> Attachments: HADOOP-17072.001.patch
>
>
> In a federated setting (HDFS federation, federation across multiple buckets
> on S3, multiple containers across Azure storage), certain system
> tools/pipelines require the ability to map paths to the clusters/accounts.
> Consider the example of GDPR compliance/retention jobs that need to go over
> various datasets, ingested over a period of T days and remove/quarantine
> datasets that are not properly annotated/have reached their retention period.
> Such jobs can rely on renames to a global trash/quarantine directory to
> accomplish their task. However, in a federated setting, efficient, atomic
> renames (as those within a single HDFS cluster) are not supported across the
> different clusters/shards in federation. As a result, such jobs will need to
> leverage a trash/quarantine directory per cluster/shard. Further, they would
> need to map from a particular path to the cluster/shard that contains this
> path.
> To address such cases, this JIRA proposes to get add two new methods to
> {{FileSystem}}: {{getClusterRoot}} and {{getClusterRoots()}}.
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