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https://issues.apache.org/jira/browse/HDFS-5714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14718219#comment-14718219
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Yi Liu commented on HDFS-5714:
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Thanks [~jingzhao].
I think this is good, can you rebase the patch?
> Use byte array to represent UnderConstruction feature and Snapshot feature
> for INodeFile
> ----------------------------------------------------------------------------------------
>
> Key: HDFS-5714
> URL: https://issues.apache.org/jira/browse/HDFS-5714
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Attachments: HDFS-5714.000.patch
>
>
> Currently we define specific classes to represent different INode features,
> such as FileUnderConstructionFeature and FileWithSnapshotFeature. While
> recording these feature information in memory, the internal information and
> object references can still cost a lot of memory. For example, for
> FileWithSnapshotFeature, not considering the INode's local name, the whole
> FileDiff list (with size n) can cost around 120n bytes.
> In order to decrease the memory usage, we plan to use byte array to record
> the UnderConstruction feature and Snapshot feature for INodeFile.
> Specifically, if we use protobuf's encoding, the memory usage for a
> FileWithSnapshotFeature can be less than 56n bytes.
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