mirror of https://github.com/minio/minio.git
110 lines
2.7 KiB
Go
110 lines
2.7 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2016 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"context"
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"io"
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"sync"
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"github.com/minio/minio/cmd/logger"
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)
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// Writes in parallel to writers
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type parallelWriter struct {
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writers []io.Writer
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writeQuorum int
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errs []error
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}
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// Write writes data to writers in parallel.
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func (p *parallelWriter) Write(ctx context.Context, blocks [][]byte) error {
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var wg sync.WaitGroup
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for i := range p.writers {
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if p.writers[i] == nil {
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p.errs[i] = errDiskNotFound
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continue
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}
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wg.Add(1)
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go func(i int) {
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defer wg.Done()
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_, p.errs[i] = p.writers[i].Write(blocks[i])
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if p.errs[i] != nil {
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p.writers[i] = nil
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}
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}(i)
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}
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wg.Wait()
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// If nilCount >= p.writeQuorum, we return nil. This is because HealFile() uses
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// CreateFile with p.writeQuorum=1 to accommodate healing of single disk.
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// i.e if we do no return here in such a case, reduceWriteQuorumErrs() would
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// return a quorum error to HealFile().
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nilCount := 0
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for _, err := range p.errs {
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if err == nil {
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nilCount++
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}
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}
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if nilCount >= p.writeQuorum {
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return nil
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}
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return reduceWriteQuorumErrs(ctx, p.errs, objectOpIgnoredErrs, p.writeQuorum)
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}
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// Encode reads from the reader, erasure-encodes the data and writes to the writers.
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func (e *Erasure) Encode(ctx context.Context, src io.Reader, writers []io.Writer, buf []byte, quorum int) (total int64, err error) {
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writer := ¶llelWriter{
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writers: writers,
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writeQuorum: quorum,
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errs: make([]error, len(writers)),
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}
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for {
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var blocks [][]byte
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n, err := io.ReadFull(src, buf)
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if err != nil && err != io.EOF && err != io.ErrUnexpectedEOF {
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logger.LogIf(ctx, err)
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return 0, err
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}
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eof := err == io.EOF || err == io.ErrUnexpectedEOF
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if n == 0 && total != 0 {
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// Reached EOF, nothing more to be done.
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break
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}
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// We take care of the situation where if n == 0 and total == 0 by creating empty data and parity files.
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blocks, err = e.EncodeData(ctx, buf[:n])
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if err != nil {
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logger.LogIf(ctx, err)
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return 0, err
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}
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if err = writer.Write(ctx, blocks); err != nil {
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logger.LogIf(ctx, err)
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return 0, err
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}
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total += int64(n)
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if eof {
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break
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}
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}
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return total, nil
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}
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