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https://issues.apache.org/jira/browse/HDFS-10262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15227148#comment-15227148
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Chris Douglas commented on HDFS-10262:
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For compatibility with existing 2.x clients, the signature for {{getFileId}}
should not change, and the "fileId" field should still be populated as a long
in WebHDFS.
> Change HdfsFileStatus::fileId to an opaque identifier
> -----------------------------------------------------
>
> Key: HDFS-10262
> URL: https://issues.apache.org/jira/browse/HDFS-10262
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client, webhdfs
> Reporter: Chris Douglas
>
> HDFS exposes the INode ID as a long via HdfsFileStatus::getFileId. Since
> equality is the only valid client operation (sequential/monotonically
> increasing ids are not guaranteed in any spec; leases do not rely on any
> other property), this identifier can be opaque instead of assigning it a
> primitive type in HdfsFileStatus.
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