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https://issues.apache.org/jira/browse/HDFS-8815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14639163#comment-14639163
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Arpit Agarwal commented on HDFS-8815:
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See HADOOP-12161 comments for a couple of proposed approaches:
# Add a new NameNode RPC call that returns the policy object.
# Cache the policy suite on the client so subsequent calls don't need to fetch
it again.
> DFS getStoragePolicy implementation using single RPC call
> ---------------------------------------------------------
>
> Key: HDFS-8815
> URL: https://issues.apache.org/jira/browse/HDFS-8815
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 2.8.0
> Reporter: Arpit Agarwal
>
> 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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