[jira] [Commented] (HDFS-10880) Federation Mount Table State Store internal API

["maobaolong (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-10880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16385482#comment-16385482 ] 

maobaolong commented on HDFS-10880:
-----------------------------------

[~elgoiri] Thank you to contribute this feature. But i don't see any use about the DestinationOrder. 


{code:java}
public enum DestinationOrder {
   HASH, // Follow consistent hashing
   LOCAL, // Local first
   RANDOM // Random order
}
{code}

I've seen the use of multiTarget in RouterRpcClient like invokeConcurrent and invokeSequential method, I know the use of multiTarget there seems to ensure FT.

Please show more use case about the multiTarget and destinationOrder, I want to use and test those cool features. Thank you.

> Federation Mount Table State Store internal API
> -----------------------------------------------
>
>                 Key: HDFS-10880
>                 URL: https://issues.apache.org/jira/browse/HDFS-10880
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: fs
>            Reporter: Jason Kace
>            Assignee: Íñigo Goiri
>            Priority: Major
>             Fix For: 2.9.0, 3.0.0
>
>         Attachments: HDFS-10880-HDFS-10467-000.patch, HDFS-10880-HDFS-10467-001.patch, HDFS-10880-HDFS-10467-002.patch, HDFS-10880-HDFS-10467-003.patch, HDFS-10880-HDFS-10467-004.patch, HDFS-10880-HDFS-10467-005.patch, HDFS-10880-HDFS-10467-006.patch, HDFS-10880-HDFS-10467-007.patch, HDFS-10880-HDFS-10467-008.patch
>
>
> The Federation Mount Table State encapsulates the mapping of file paths in the global namespace to a specific NN(nameservice) and local NN path.  The mount table is shared by all router instances and represents a unified view of the global namespace.   The state store API for the mount table allows the related records to be queried, updated and deleted.



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