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https://issues.apache.org/jira/browse/HDFS-9633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Zhuge updated HDFS-9633:
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Description:
Add more behavior-based unit tests to verify and document SnapshotDiffReport
API behaviors:
* DeleteRecreateSameName: Delete a file, then create a new file of the same
name. Expect a DELETE and a CREATE entry instead of one MODIFY entry.
* CircularRenames: Rename file "a" to "tmp", rename "b" to "a", then rename
"tmp" to "b". Expect RENAME(a->b) and RENAME(b->a) entry.
These unit tests will prevent any future NN change from accidentally breaking
SnapshotDiffReport API.
Has anyone built incremental copy/migration tools based on command {{hdfs
snapshotDiff}} or directly on the API?
was:
SnapshotDiffReport design uses "file path" (instead of "inode ID + file path"
as one example) to represent each diff entry. This can leads to some strange
scenarios.
* DeleteRecreate: Delete a file, then create a new file of the same name.
* CircularRenames: Rename file "a" to "tmp", rename "b" to "a", then rename
"tmp" to "b".
Add more unit tests to verify these corner cases.
Summary: Add more SnapshotDiffReport unit tests (was: Test
SnapshotDiffReport file path corner cases)
> Add more SnapshotDiffReport unit tests
> --------------------------------------
>
> Key: HDFS-9633
> URL: https://issues.apache.org/jira/browse/HDFS-9633
> Project: Hadoop HDFS
> Issue Type: Test
> Reporter: John Zhuge
> Assignee: John Zhuge
> Priority: Minor
> Attachments: HDFS-9633-001.patch
>
>
> Add more behavior-based unit tests to verify and document SnapshotDiffReport
> API behaviors:
> * DeleteRecreateSameName: Delete a file, then create a new file of the same
> name. Expect a DELETE and a CREATE entry instead of one MODIFY entry.
> * CircularRenames: Rename file "a" to "tmp", rename "b" to "a", then rename
> "tmp" to "b". Expect RENAME(a->b) and RENAME(b->a) entry.
> These unit tests will prevent any future NN change from accidentally breaking
> SnapshotDiffReport API.
> Has anyone built incremental copy/migration tools based on command {{hdfs
> snapshotDiff}} or directly on the API?
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