[jira] [Commented] (HDFS-8815) DFS getStoragePolicy implementation using single RPC call

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

    [ https://issues.apache.org/jira/browse/HDFS-8815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15485302#comment-15485302 ] 

Zhe Zhang commented on HDFS-8815:
---------------------------------

Quick note that I'm working on backporting HDFS-10744 to branch-2.7; since this change is not in branch-2.7, the overlapping part won't be backported.

If someone plans to backport this to branch-2.7, please remember to add the optimization from HDFS-10744. 

> DFS getStoragePolicy implementation using single RPC call
> ---------------------------------------------------------
>
>                 Key: HDFS-8815
>                 URL: https://issues.apache.org/jira/browse/HDFS-8815
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>            Reporter: Arpit Agarwal
>            Assignee: Surendra Singh Lilhore
>             Fix For: 2.8.0, 3.0.0-alpha1
>
>         Attachments: HDFS-8815-001.patch, HDFS-8815-002.patch, HDFS-8815-003.patch, HDFS-8815-004.patch
>
>
> HADOOP-12161 introduced a new {{FileSystem#getStoragePolicy}} call. The DFS implementation of the call requires two RPC calls, the first to fetch the storage policy ID and the second to fetch the policy suite to map the policy ID to a {{BlockStoragePolicySpi}}.
> Fix the implementation to require a single RPC call.



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