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https://issues.apache.org/jira/browse/HDFS-11163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15814077#comment-15814077
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Tsz Wo Nicholas Sze commented on HDFS-11163:
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> ... It will require an additional getStoragePolicy RPC per file with the
> default storage policy, whereas previously there was no RPC for those files.
> ...
Indeed, the additional RPC is not needed since HdfsLocatedFileStatus already
has the resolved storage policy. We don't need to call getStoragePolicy again.
> Mover should move the file blocks to default storage once policy is unset
> -------------------------------------------------------------------------
>
> Key: HDFS-11163
> URL: https://issues.apache.org/jira/browse/HDFS-11163
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer & mover
> Affects Versions: 2.8.0
> Reporter: Surendra Singh Lilhore
> Assignee: Surendra Singh Lilhore
> Attachments: HDFS-11163-001.patch, HDFS-11163-002.patch
>
>
> HDFS-9534 added new API in FileSystem to unset the storage policy. Once
> policy is unset blocks should move back to the default storage policy.
> Currently mover is not moving file blocks which have zero storage ID
> {code}
> // currently we ignore files with unspecified storage policy
> if (policyId == HdfsConstants.BLOCK_STORAGE_POLICY_ID_UNSPECIFIED) {
> return;
> }
> {code}
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