Brandon Li created HDFS-4489:
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Summary: Use InodeID as as an identifier of a file in HDFS
protocols and APIs
Key: HDFS-4489
URL: https://issues.apache.org/jira/browse/HDFS-4489
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Reporter: Brandon Li
Assignee: Brandon Li
The benefit of using InodeID to uniquely identify a file can be multiple folds.
Here are a few of them:
1. uniquely identify a file cross rename, related JIRAs include HDFS-4258,
HDFS-4437.
2. modification checks in tools like distcp. Since a file could have been
replaced or renamed to, the file name and size combination is no t reliable,
but the combination of file id and size is unique.
3. id based protocol support (e.g., NFS)
4. to make the pluggable block placement policy use fileid instead of filename
(HDFS-385).
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