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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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14
cmd/erasure-object.go
View File

@@ -62,7 +62,7 @@ func (er erasureObjects) CopyObject(ctx context.Context, srcBucket, srcObject, d
metaArr, errs := readAllFileInfo(ctx, storageDisks, srcBucket, srcObject, srcOpts.VersionID, false)
// get Quorum for this object
readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, er, metaArr, errs)
readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, metaArr, errs, er.defaultParityCount)
if err != nil {
return oi, toObjectErr(err, srcBucket, srcObject)
}
@@ -380,7 +380,7 @@ func (er erasureObjects) getObjectFileInfo(ctx context.Context, bucket, object s
// Read metadata associated with the object from all disks.
metaArr, errs := readAllFileInfo(ctx, disks, bucket, object, opts.VersionID, readData)
readQuorum, _, err := objectQuorumFromMeta(ctx, er, metaArr, errs)
readQuorum, _, err := objectQuorumFromMeta(ctx, metaArr, errs, er.defaultParityCount)
if err != nil {
return fi, nil, nil, err
}
@@ -595,8 +595,8 @@ func (er erasureObjects) putObject(ctx context.Context, bucket string, object st
// Get parity and data drive count based on storage class metadata
parityDrives := globalStorageClass.GetParityForSC(opts.UserDefined[xhttp.AmzStorageClass])
if parityDrives == 0 {
parityDrives = getDefaultParityBlocks(len(storageDisks))
if parityDrives <= 0 {
parityDrives = er.defaultParityCount
}
dataDrives := len(storageDisks) - parityDrives
@@ -604,7 +604,7 @@ func (er erasureObjects) putObject(ctx context.Context, bucket string, object st
// writeQuorum is dataBlocks + 1
writeQuorum := dataDrives
if dataDrives == parityDrives {
writeQuorum = dataDrives + 1
writeQuorum++
}
// Delete temporary object in the event of failure.
@@ -1093,7 +1093,7 @@ func (er erasureObjects) PutObjectTags(ctx context.Context, bucket, object strin
// Read metadata associated with the object from all disks.
metaArr, errs := readAllFileInfo(ctx, disks, bucket, object, opts.VersionID, false)
readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, er, metaArr, errs)
readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, metaArr, errs, er.defaultParityCount)
if err != nil {
return toObjectErr(err, bucket, object)
}
@@ -1154,7 +1154,7 @@ func (er erasureObjects) updateObjectMeta(ctx context.Context, bucket, object st
// Read metadata associated with the object from all disks.
metaArr, errs := readAllFileInfo(ctx, disks, bucket, object, opts.VersionID, false)
readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, er, metaArr, errs)
readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, metaArr, errs, er.defaultParityCount)
if err != nil {
return toObjectErr(err, bucket, object)
}