4a007e3767
If the requested server is part of the set this will always read from the local disk, even if the disk contains a parity shard. In default setup there is a 50% chance that at least one shard that otherwise would have been fetched remotely will be read locally instead. It basically trades RPC call overhead for reed-solomon. On distributed localhost this seems to be fairly break-even, with a very small gain in throughput and latency. However on networked servers this should be a bigger 1MB objects, before: ``` Operation: GET. Concurrency: 32. Hosts: 4. Requests considered: 76257: * Avg: 25ms 50%: 24ms 90%: 32ms 99%: 42ms Fastest: 7ms Slowest: 67ms * First Byte: Average: 23ms, Median: 22ms, Best: 5ms, Worst: 65ms Throughput: * Average: 1213.68 MiB/s, 1272.63 obj/s (59.948s, starting 14:45:44 CEST) ``` After: ``` Operation: GET. Concurrency: 32. Hosts: 4. Requests considered: 78845: * Avg: 24ms 50%: 24ms 90%: 31ms 99%: 39ms Fastest: 8ms Slowest: 62ms * First Byte: Average: 22ms, Median: 21ms, Best: 6ms, Worst: 57ms Throughput: * Average: 1255.11 MiB/s, 1316.08 obj/s (59.938s, starting 14:43:58 CEST) ``` Bonus fix: Only ask for heal once on an object.
49 lines
1.4 KiB
Go
49 lines
1.4 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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"github.com/minio/minio/cmd/logger"
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)
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// Heal heals the shard files on non-nil writers. Note that the quorum passed is 1
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// as healing should continue even if it has been successful healing only one shard file.
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func (e Erasure) Heal(ctx context.Context, readers []io.ReaderAt, writers []io.Writer, size int64) error {
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r, w := io.Pipe()
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go func() {
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if err := e.Decode(ctx, w, readers, 0, size, size, nil); err != nil {
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w.CloseWithError(err)
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return
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}
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w.Close()
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}()
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buf := make([]byte, e.blockSize)
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// quorum is 1 because CreateFile should continue writing as long as we are writing to even 1 disk.
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n, err := e.Encode(ctx, r, writers, buf, 1)
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if err != nil {
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return err
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}
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if n != size {
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logger.LogIf(ctx, errLessData)
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return errLessData
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}
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return nil
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}
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