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https://issues.apache.org/jira/browse/HDFS-7076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14136646#comment-14136646
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Jing Zhao commented on HDFS-7076:
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I have a preliminary patch which is more than 120K. I will split it into
several jiras. First created HDFS-7081 to add a new DistributedFileSystem API
for getting all the existing storage policies. In this way we can remove the
dependency of the XML configuration file from the client/Mover side.
> Persist Block Storage Policy in FSImage and Edit Log
> ----------------------------------------------------
>
> Key: HDFS-7076
> URL: https://issues.apache.org/jira/browse/HDFS-7076
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: balancer, namenode
> Reporter: Jing Zhao
> Assignee: Jing Zhao
>
> Currently block storage policies are loaded from a XML file. This may lead to
> policy inconsistency if the content of the XML gets modified or if the XML
> file is replaced by mistake. Thus it is better to persist policies in
> editlog/fsimage.
> Specifically we plan to do the following in this jira:
> # Add new DistributedFileSystem API for getting all the existing storage
> policies
> # Add new DistributedFileSystem/HdfsAdmin API for adding a new storage
> policy. The new storage policy is then persisted in editlog and later fsimage
> while checkpointing.
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