ArafatKhan2198 commented on PR #6231:
URL: https://github.com/apache/ozone/pull/6231#issuecomment-2138839415
### Explanation of the `convertToObjectPath` Method
The `convertToObjectPath` method converts a key prefix into an object path
within the Ozone file system, based on the structure and layout of volumes,
buckets, directories, and keys. Here’s a breakdown of how it works:
1. **Normalize the Path and Parse Request Path:**
- The method starts by normalizing the input path and parsing it into its
components (volume, bucket, directories, and key).
2. **Root-Level Check:**
- If the input path is empty, it returns the original path
(`prevKeyPrefix`).
3. **Volume-Level Check:**
- If the path contains only the volume name, it fetches the `volumeId`
and returns the path constructed with the volume ID.
4. **Bucket-Level Check:**
- If the path contains volume and bucket names, it fetches the `bucketId`
and returns the path constructed with the volume and bucket IDs, unless the
bucket layout is not FILE_SYSTEM_OPTIMIZED.
5. **Directory or Key-Level Check:**
- If the path contains more than two components, it checks if the last
entity (directory or key) exists:
- If it's a directory, it returns the path constructed with the
directory ID.
- If it's a key, it returns the path constructed with the key's parent
directory ID and the key name.
6. **Exception Handling:**
- If any exception occurs during the process, it logs the error and
returns the original path.
### Expected Outputs for Given Inputs:
1. **Input: `volume/bucket/key`**
- Parsed Names: `["volume", "bucket", "key"]`
- Fetch `volumeId` for `volume`.
- Fetch `bucketId` for `bucket`.
- Check if `key` is a key in `bucket`.
- If `key` exists, return `volumeId/bucketId/parentDirectoryId/key`.
2. **Input: `volume/bucket/dir1`**
- Parsed Names: `["volume", "bucket", "dir1"]`
- Fetch `volumeId` for `volume`.
- Fetch `bucketId` for `bucket`.
- Check if `dir1` is a directory in `bucket`.
- If `dir1` exists as a directory, return `volumeId/bucketId/dir1Id/`.
3. **Input: `volume/bucket/dir1/key`**
- Parsed Names: `["volume", "bucket", "dir1", "key"]`
- Fetch `volumeId` for `volume`.
- Fetch `bucketId` for `bucket`.
- Check if `dir1` is a directory in `bucket`.
- Check if `key` is a key in `dir1`.
- If `key` exists, return `volumeId/bucketId/dir1Id/key`.
4. **Input: `volume/bucket/dir1/dir2`**
- Parsed Names: `["volume", "bucket", "dir1", "dir2"]`
- Fetch `volumeId` for `volume`.
- Fetch `bucketId` for `bucket`.
- Check if `dir1` and `dir2` are directories in `bucket`.
- If `dir2` exists as a directory, return `volumeId/bucketId/dir2Id/`.
5. **Input: `volume/bucket/dir1/dir2/key`**
- Parsed Names: `["volume", "bucket", "dir1", "dir2", "key"]`
- Fetch `volumeId` for `volume`.
- Fetch `bucketId` for `bucket`.
- Check if `dir1` and `dir2` are directories in `bucket`.
- Check if `key` is a key in `dir2`.
- If `key` exists, return `volumeId/bucketId/dir2Id/key`.
### Handling Missing Paths:
- If at any step, the path component (directory or key) does not exist, the
method returns the original `prevKeyPrefix`.
I hope this clarifies the workings of the `convertToObjectPath` method!
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