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https://issues.apache.org/jira/browse/HDFS-15133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17033022#comment-17033022
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hemanthboyina commented on HDFS-15133:
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{quote}as in the existing HDFS code we have a tree structure of INode's in Heap
which will be put in INodeMap and used as reference
{quote}
Each inode contains reference to parent and its children. So putting the INode
into DB doesn't solve our issue , as inode contains its children inodes as a
referrence ,if you add a child its parent needs to be updated . this doesn't
happen if we put inode in rocksdb
> Use rocksdb to store NameNode inode and blockInfo
> -------------------------------------------------
>
> Key: HDFS-15133
> URL: https://issues.apache.org/jira/browse/HDFS-15133
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 3.3.0
> Reporter: maobaolong
> Priority: Major
> Attachments: image-2020-01-28-12-30-33-015.png
>
>
> Maybe we don't need checkpoint to a fsimage file, the rocksdb checkpoint can
> achieve the same request.
> This is ozone and alluxio way to manage meta data of master node.
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