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Add large bucket support for erasure coded backend (#5160)

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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
This commit is contained in:
Harshavardhana
2018-02-15 17:45:57 -08:00
committed by kannappanr
parent dd80256151
commit fb96779a8a
82 changed files with 5046 additions and 4771 deletions
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8
cmd/storage-class.go
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@@ -148,12 +148,12 @@ func validateParity(ssParity, rrsParity int) (err error) {
return fmt.Errorf("Reduced redundancy storage class parity %d should be greater than or equal to %d", rrsParity, minimumParityDisks)
}
if ssParity > len(globalEndpoints)/2 {
return fmt.Errorf("Standard storage class parity %d should be less than or equal to %d", ssParity, len(globalEndpoints)/2)
if ssParity > globalXLSetDriveCount/2 {
return fmt.Errorf("Standard storage class parity %d should be less than or equal to %d", ssParity, globalXLSetDriveCount/2)
}
if rrsParity > len(globalEndpoints)/2 {
return fmt.Errorf("Reduced redundancy storage class parity %d should be less than or equal to %d", rrsParity, len(globalEndpoints)/2)
if rrsParity > globalXLSetDriveCount/2 {
return fmt.Errorf("Reduced redundancy storage class parity %d should be less than or equal to %d", rrsParity, globalXLSetDriveCount/2)
}
if ssParity > 0 && rrsParity > 0 {