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https://issues.apache.org/jira/browse/HDFS-4434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13561270#comment-13561270
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Brandon Li commented on HDFS-4434:
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Some rough estimation: suppose one map entry takes minimal 16 bytes(8b-inodeid,
8b-inode reference), ~160MB is required for 10 million inodes.
> Provide a mapping from INodeId to INode
> ---------------------------------------
>
> Key: HDFS-4434
> URL: https://issues.apache.org/jira/browse/HDFS-4434
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: 3.0.0
> Reporter: Brandon Li
> Assignee: Brandon Li
>
> This JIRA is to provide a way to access the INode via its id. The proposed
> solution is to have an in-memory mapping from INodeId to INode.
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