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erasure: simplify XL backend operations (#4649) (#4758)

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This change provides new implementations of the XL backend operations:
 - create file
 - read   file
 - heal   file
Further this change adds table based tests for all three operations.

This affects also the bitrot algorithm integration. Algorithms are now
integrated in an idiomatic way (like crypto.Hash).
Fixes #4696
Fixes #4649
Fixes #4359
This commit is contained in:
Andreas Auernhammer
2017-08-14 18:08:42 -07:00
committed by Dee Koder
parent 617f2394fb
commit 85fcee1919
33 changed files with 1238 additions and 1863 deletions
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13
vendor/github.com/klauspost/reedsolomon/README.md generated vendored
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@@ -22,6 +22,19 @@ To get the package use the standard:
go get github.com/klauspost/reedsolomon
```
# Changes
## July 20, 2017
`ReconstructData` added to [`Encoder`](https://godoc.org/github.com/klauspost/reedsolomon#Encoder) interface. This can cause compatibility issues if you implement your own Encoder. A simple workaround can be added:
```Go
func (e *YourEnc) ReconstructData(shards [][]byte) error {
return ReconstructData(shards)
}
```
You can of course also do your own implementation. The [`StreamEncoder`](https://godoc.org/github.com/klauspost/reedsolomon#StreamEncoder) handles this without modifying the interface. This is a good lesson on why returning interfaces is not a good design.
# Usage
This section assumes you know the basics of Reed-Solomon encoding. A good start is this [Backblaze blog post](https://www.backblaze.com/blog/reed-solomon/).