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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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erasure-createfile.go
+3 -3
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@@ -32,8 +32,7 @@ func (e erasure) cleanupCreateFileOps(volume, path string, writers []io.WriteClo
}
}
// WriteErasure reads predefined blocks, encodes them and writes to
// configured storage disks.
// WriteErasure reads predefined blocks, encodes them and writes to configured storage disks.
func (e erasure) writeErasure(volume, path string, reader *io.PipeReader, wcloser *waitCloser) {
// Release the block writer upon function return.
defer wcloser.release()
@@ -119,7 +118,8 @@ func (e erasure) writeErasure(volume, path string, reader *io.PipeReader, wclose
// Write encoded data in routine.
go func(index int, writer io.Writer) {
defer wg.Done()
encodedData := dataBlocks[index]
// Pick the block from the distribution.
encodedData := dataBlocks[e.distribution[index]-1]
_, wErr := writers[index].Write(encodedData)
if wErr != nil {
wErrs[index] = wErr