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
59 lines
1.6 KiB
Go
59 lines
1.6 KiB
Go
/*
|
|
* Minio Cloud Storage, (C) 2017 Minio, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package errgroup
|
|
|
|
import (
|
|
"sync"
|
|
)
|
|
|
|
// A Group is a collection of goroutines working on subtasks that are part of
|
|
// the same overall task.
|
|
//
|
|
// A zero Group is valid and does not cancel on error.
|
|
type Group struct {
|
|
wg sync.WaitGroup
|
|
errs []error
|
|
}
|
|
|
|
// WithNErrs returns a new Group with length of errs slice upto nerrs,
|
|
// upon Wait() errors are returned collected from all tasks.
|
|
func WithNErrs(nerrs int) *Group {
|
|
return &Group{errs: make([]error, nerrs)}
|
|
}
|
|
|
|
// Wait blocks until all function calls from the Go method have returned, then
|
|
// returns the slice of errors from all function calls.
|
|
func (g *Group) Wait() []error {
|
|
g.wg.Wait()
|
|
return g.errs
|
|
}
|
|
|
|
// Go calls the given function in a new goroutine.
|
|
//
|
|
// The first call to return a non-nil error will be
|
|
// collected in errs slice and returned by Wait().
|
|
func (g *Group) Go(f func() error, index int) {
|
|
g.wg.Add(1)
|
|
|
|
go func() {
|
|
defer g.wg.Done()
|
|
|
|
if err := f(); err != nil {
|
|
g.errs[index] = err
|
|
}
|
|
}()
|
|
}
|