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Support variable server pools (#11256)

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Current implementation requires server pools to have
same erasure stripe sizes, to facilitate same SLA
and expectations.

This PR allows server pools to be variadic, i.e they
do not have to be same erasure stripe sizes - instead
they should have SLA for parity ratio.

If the parity ratio cannot be guaranteed by the new
server pool, the deployment is rejected i.e server
pool expansion is not allowed.
This commit is contained in:
Harshavardhana
2021-01-16 12:08:02 -08:00
committed by GitHub
parent 40d59c1961
commit f903cae6ff
26 changed files with 254 additions and 199 deletions
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22
cmd/erasure-server-pool.go
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@@ -78,6 +78,7 @@ func newErasureServerPools(ctx context.Context, endpointServerPools EndpointServ
return nil, err
}
if deploymentID == "" {
// all zones should have same deployment ID
deploymentID = formats[i].ID
}
z.serverPools[i], err = newErasureSets(ctx, ep.Endpoints, storageDisks[i], formats[i])
@@ -277,15 +278,16 @@ func (z *erasureServerPools) Shutdown(ctx context.Context) error {
func (z *erasureServerPools) BackendInfo() (b BackendInfo) {
b.Type = BackendErasure
setDriveCount := z.SetDriveCount()
scParity := globalStorageClass.GetParityForSC(storageclass.STANDARD)
if scParity == 0 {
scParity = z.SetDriveCount() / 2
if scParity <= 0 {
scParity = z.serverPools[0].defaultParityCount
}
b.StandardSCData = z.SetDriveCount() - scParity
b.StandardSCData = setDriveCount - scParity
b.StandardSCParity = scParity
rrSCParity := globalStorageClass.GetParityForSC(storageclass.RRS)
b.RRSCData = z.SetDriveCount() - rrSCParity
b.RRSCData = setDriveCount - rrSCParity
b.RRSCParity = rrSCParity
return
}
@@ -1437,15 +1439,9 @@ func (z *erasureServerPools) Health(ctx context.Context, opts HealthOptions) Hea
reqInfo := (&logger.ReqInfo{}).AppendTags("maintenance", strconv.FormatBool(opts.Maintenance))
parityDrives := globalStorageClass.GetParityForSC(storageclass.STANDARD)
diskCount := z.SetDriveCount()
if parityDrives == 0 {
parityDrives = getDefaultParityBlocks(diskCount)
}
dataDrives := diskCount - parityDrives
writeQuorum := dataDrives
if dataDrives == parityDrives {
b := z.BackendInfo()
writeQuorum := b.StandardSCData
if b.StandardSCData == b.StandardSCParity {
writeQuorum++
}