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https://issues.apache.org/jira/browse/HDFS-8059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14483991#comment-14483991
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Zhe Zhang commented on HDFS-8059:
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bq. Therefore if we really need to save memory in the future, we can even skip
the two numbers in the INodeFile level maybe.
This is a little expensive, as traversing the name space to dir level requires
a read lock. And NameNode frequently needs EC policy info (e.g. to get desired
number of storage locations).
> Erasure coding: move dataBlockNum and parityBlockNum from BlockInfoStriped to
> INodeFile
> ---------------------------------------------------------------------------------------
>
> Key: HDFS-8059
> URL: https://issues.apache.org/jira/browse/HDFS-8059
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: HDFS-7285
> Reporter: Yi Liu
> Assignee: Yi Liu
> Attachments: HDFS-8059.001.patch
>
>
> Move {{dataBlockNum}} and {{parityBlockNum}} from BlockInfoStriped to
> INodeFile, and store them in {{FileWithStripedBlocksFeature}}.
> Ideally these two nums are the same for all striped blocks in a file, and
> store them in BlockInfoStriped will waste NN memory.
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