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Posted to hdfs-issues@hadoop.apache.org by "jianghua zhu (Jira)" <ji...@apache.org> on 2020/09/08 08:03:00 UTC
[jira] [Commented] (HDFS-15513) Allow client to query snapshot
status on one directory
[ https://issues.apache.org/jira/browse/HDFS-15513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17192021#comment-17192021 ]
jianghua zhu commented on HDFS-15513:
-------------------------------------
We can add more fine-grained interfaces that external users can access, such as: obtaining specific information through the snapshot name.
It can be implemented in 2 places:
1. In the DFSClient class;
2. Can be accessed by command;
[~elgoiri] , do you have other ideas?
> Allow client to query snapshot status on one directory
> ------------------------------------------------------
>
> Key: HDFS-15513
> URL: https://issues.apache.org/jira/browse/HDFS-15513
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs, hdfs-client
> Affects Versions: 3.3.0
> Reporter: Siyao Meng
> Priority: Major
>
> Alternatively, we can allow the client to query snapshot status on *a list of* given directories by the client. Thoughts?
> Rationale:
> At the moment, we could only retrieve the full list of snapshottable directories with [{{getSnapshottableDirListing()}}|https://github.com/apache/hadoop/blob/233619a0a462ae2eb7e7253b6bb8ae48eaa5eb19/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java#L6986-L6994]. This leads to the inefficiency In HDFS-15492 that we have to get the *entire* list of snapshottable directory to check if a file being deleted is inside a snapshottable directory.
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