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gilbertchen
2016-02-23 22:35:57 -05:00
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DESIGN.md
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@@ -49,10 +49,14 @@ The second step, called the *fossil deletion* step, will permanently delete foss
* For each snapshot id, there is a new snapshot that was not seen by the fossil collection step * For each snapshot id, there is a new snapshot that was not seen by the fossil collection step
* The new snapshot must finish after the fossil collection step * The new snapshot must finish after the fossil collection step
![](https://raw.githubusercontent.com/gilbertchen/duplicacy-beta/master/images/fossil_collection_1.png)
The first condition guarantees that if a backup procedure references a chunk before the deletion procedure turns it into a fossil, the reference will be detected in the fossil deletion step which will then turn the fossil back into a normal chunk. The first condition guarantees that if a backup procedure references a chunk before the deletion procedure turns it into a fossil, the reference will be detected in the fossil deletion step which will then turn the fossil back into a normal chunk.
The second condition guarantees that any backup procedure unknown to the fossil deletion step can start only after the fossil collection step finishes. Therefore, if it references a chunk that was identified as fossil in the fossil collection step, it should observe the fossil, not the chunk, so it will upload a new chunk, according to the second fossil access rule. The second condition guarantees that any backup procedure unknown to the fossil deletion step can start only after the fossil collection step finishes. Therefore, if it references a chunk that was identified as fossil in the fossil collection step, it should observe the fossil, not the chunk, so it will upload a new chunk, according to the second fossil access rule.
![](https://raw.githubusercontent.com/gilbertchen/duplicacy-beta/master/images/fossil_collection_2.png)
## Snapshot Format ## Snapshot Format
A snapshot file is a file that the backup procedure uploads to the file storage after it finishes splitting files into A snapshot file is a file that the backup procedure uploads to the file storage after it finishes splitting files into