f21d650ed4
This PR refactors the way we use buffers for O_DIRECT and to re-use those buffers for messagepack reader writer. After some extensive benchmarking found that not all objects have this benefit, and only objects smaller than 64KiB see this benefit overall. Benefits are seen from almost all objects from 1KiB - 32KiB Beyond this no objects see benefit with bulk call approach as the latency of bytes sent over the wire v/s streaming content directly from disk negate each other with no remarkable benefits. All other optimizations include reuse of msgp.Reader, msgp.Writer using sync.Pool's for all internode calls.
127 lines
4.6 KiB
Go
127 lines
4.6 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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)
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// StorageAPI interface.
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type StorageAPI interface {
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// Stringified version of disk.
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String() string
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// Storage operations.
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IsOnline() bool // Returns true if disk is online.
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IsLocal() bool
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Hostname() string // Returns host name if remote host.
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Endpoint() Endpoint // Returns endpoint.
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Close() error
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GetDiskID() (string, error)
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SetDiskID(id string)
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Healing() bool // Returns if disk is healing.
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DiskInfo(ctx context.Context) (info DiskInfo, err error)
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CrawlAndGetDataUsage(ctx context.Context, cache dataUsageCache) (dataUsageCache, error)
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// Volume operations.
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MakeVol(ctx context.Context, volume string) (err error)
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MakeVolBulk(ctx context.Context, volumes ...string) (err error)
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ListVols(ctx context.Context) (vols []VolInfo, err error)
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StatVol(ctx context.Context, volume string) (vol VolInfo, err error)
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DeleteVol(ctx context.Context, volume string, forceDelete bool) (err error)
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// WalkDir will walk a directory on disk and return a metacache stream on wr.
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WalkDir(ctx context.Context, opts WalkDirOptions, wr io.Writer) error
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// WalkVersions in sorted order directly on disk.
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WalkVersions(ctx context.Context, volume, dirPath, marker string, recursive bool, endWalkCh <-chan struct{}) (chan FileInfoVersions, error)
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// Metadata operations
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DeleteVersion(ctx context.Context, volume, path string, fi FileInfo) error
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DeleteVersions(ctx context.Context, volume string, versions []FileInfo) []error
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WriteMetadata(ctx context.Context, volume, path string, fi FileInfo) error
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ReadVersion(ctx context.Context, volume, path, versionID string, readData bool) (FileInfo, error)
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RenameData(ctx context.Context, srcVolume, srcPath, dataDir, dstVolume, dstPath string) error
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// File operations.
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ListDir(ctx context.Context, volume, dirPath string, count int) ([]string, error)
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ReadFile(ctx context.Context, volume string, path string, offset int64, buf []byte, verifier *BitrotVerifier) (n int64, err error)
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AppendFile(ctx context.Context, volume string, path string, buf []byte) (err error)
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CreateFile(ctx context.Context, volume, path string, size int64, reader io.Reader) error
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ReadFileStream(ctx context.Context, volume, path string, offset, length int64) (io.ReadCloser, error)
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RenameFile(ctx context.Context, srcVolume, srcPath, dstVolume, dstPath string) error
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CheckParts(ctx context.Context, volume string, path string, fi FileInfo) error
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CheckFile(ctx context.Context, volume string, path string) (err error)
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Delete(ctx context.Context, volume string, path string, recursive bool) (err error)
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VerifyFile(ctx context.Context, volume, path string, fi FileInfo) error
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// Write all data, syncs the data to disk.
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// Should be used for smaller payloads.
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WriteAll(ctx context.Context, volume string, path string, b []byte) (err error)
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// Read all.
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ReadAll(ctx context.Context, volume string, path string) (buf []byte, err error)
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}
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// storageReader is an io.Reader view of a disk
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type storageReader struct {
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storage StorageAPI
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volume, path string
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offset int64
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}
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func (r *storageReader) Read(p []byte) (n int, err error) {
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nn, err := r.storage.ReadFile(context.TODO(), r.volume, r.path, r.offset, p, nil)
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r.offset += nn
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n = int(nn)
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if err == io.ErrUnexpectedEOF && nn > 0 {
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err = io.EOF
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}
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return
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}
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// storageWriter is a io.Writer view of a disk.
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type storageWriter struct {
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storage StorageAPI
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volume, path string
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}
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func (w *storageWriter) Write(p []byte) (n int, err error) {
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err = w.storage.AppendFile(context.TODO(), w.volume, w.path, p)
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if err == nil {
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n = len(p)
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}
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return
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}
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// StorageWriter returns a new io.Writer which appends data to the file
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// at the given disk, volume and path.
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func StorageWriter(storage StorageAPI, volume, path string) io.Writer {
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return &storageWriter{storage, volume, path}
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}
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// StorageReader returns a new io.Reader which reads data to the file
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// at the given disk, volume, path and offset.
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func StorageReader(storage StorageAPI, volume, path string, offset int64) io.Reader {
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return &storageReader{storage, volume, path, offset}
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}
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