fb96779a8a
This PR implements an object layer which combines input erasure sets of XL layers into a unified namespace. This object layer extends the existing erasure coded implementation, it is assumed in this design that providing > 16 disks is a static configuration as well i.e if you started the setup with 32 disks with 4 sets 8 disks per pack then you would need to provide 4 sets always. Some design details and restrictions: - Objects are distributed using consistent ordering to a unique erasure coded layer. - Each pack has its own dsync so locks are synchronized properly at pack (erasure layer). - Each pack still has a maximum of 16 disks requirement, you can start with multiple such sets statically. - Static sets set of disks and cannot be changed, there is no elastic expansion allowed. - Static sets set of disks and cannot be changed, there is no elastic removal allowed. - ListObjects() across sets can be noticeably slower since List happens on all servers, and is merged at this sets layer. Fixes #5465 Fixes #5464 Fixes #5461 Fixes #5460 Fixes #5459 Fixes #5458 Fixes #5460 Fixes #5488 Fixes #5489 Fixes #5497 Fixes #5496
78 lines
2 KiB
Go
78 lines
2 KiB
Go
// Original work https://github.com/oxtoacart/bpool borrowed
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// only bpool.go licensed under Apache 2.0.
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// This file modifies original bpool.go to add one more option
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// to provide []byte capacity for better GC management.
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/*
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* Minio Cloud Storage (C) 2018 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 bpool
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// BytePoolCap implements a leaky pool of []byte in the form of a bounded channel.
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type BytePoolCap struct {
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c chan []byte
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w int
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wcap int
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}
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// NewBytePoolCap creates a new BytePool bounded to the given maxSize, with new
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// byte arrays sized based on width.
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func NewBytePoolCap(maxSize int, width int, capwidth int) (bp *BytePoolCap) {
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return &BytePoolCap{
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c: make(chan []byte, maxSize),
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w: width,
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wcap: capwidth,
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}
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}
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// Get gets a []byte from the BytePool, or creates a new one if none are
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// available in the pool.
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func (bp *BytePoolCap) Get() (b []byte) {
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select {
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case b = <-bp.c:
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// reuse existing buffer
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default:
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// create new buffer
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if bp.wcap > 0 {
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b = make([]byte, bp.w, bp.wcap)
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} else {
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b = make([]byte, bp.w)
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}
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}
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return
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}
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// Put returns the given Buffer to the BytePool.
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func (bp *BytePoolCap) Put(b []byte) {
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select {
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case bp.c <- b:
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// buffer went back into pool
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default:
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// buffer didn't go back into pool, just discard
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}
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}
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// Width returns the width of the byte arrays in this pool.
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func (bp *BytePoolCap) Width() (n int) {
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return bp.w
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}
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// WidthCap returns the cap width of the byte arrays in this pool.
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func (bp *BytePoolCap) WidthCap() (n int) {
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return bp.wcap
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}
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