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XL: Implement strided erasure distribution. (#1772)

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Strided erasure distribution uses a new randomized
block distribution for each Put operation. This
information is captured inside `xl.json` for subsequent
Get operations.
This commit is contained in:
Harshavardhana
2016-05-26 19:55:48 -07:00
committed by Harshavardhana
parent 6dc8323684
commit d65101a8c8
7 changed files with 36 additions and 18 deletions
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5
erasure-readfile.go
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@@ -82,13 +82,14 @@ func (e erasure) ReadFile(volume, path string, startOffset int64, totalSize int6
enBlocks := make([][]byte, len(e.storageDisks))
// Read all the readers.
for index, reader := range readers {
blockIndex := e.distribution[index] - 1
// Initialize shard slice and fill the data from each parts.
enBlocks[index] = make([]byte, curEncBlockSize)
enBlocks[blockIndex] = make([]byte, curEncBlockSize)
if reader == nil {
continue
}
// Read the necessary blocks.
_, rErr := io.ReadFull(reader, enBlocks[index])
_, rErr := io.ReadFull(reader, enBlocks[blockIndex])
if rErr != nil && rErr != io.ErrUnexpectedEOF {
readers[index].Close()
readers[index] = nil