llbsolver: create single temp lease for exports for performance #4947
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Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
This was referenced May 23, 2024
dmcgowan
reviewed
May 24, 2024
| @@ -366,11 +366,11 @@ func (h *HistoryQueue) addResource(ctx context.Context, l leases.Lease, desc *co | |||
| } | |||
| if _, err := h.hContentStore.Info(ctx, desc.Digest); err != nil { | |||
| if errdefs.IsNotFound(err) { | |||
| ctx, release, err := leaseutil.WithLease(ctx, h.hLeaseManager, leases.WithID("history_migration_"+identity.NewID()), leaseutil.MakeTemporary) | |||
| lr, ctx, err := leaseutil.NewLease(ctx, h.hLeaseManager, leases.WithID("history_migration_"+identity.NewID()), leaseutil.MakeTemporary) | |||
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Is this ctx intended to be used by the call on 383 as well?
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I guess lease on a context doesn't do anything for a AddResource call. Technically the lease created here is on the right namespace for that leasemanger but if this if statement is not reached I don't think we need to add lease for only the AddResource call.
|
Just one question about whether the shadowed ctx variable is intended. From local testing I see a significant performance improvement with this. |
dmcgowan
approved these changes
May 24, 2024
jedevc
approved these changes
May 25, 2024
AkihiroSuda
approved these changes
May 27, 2024
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Currently there is a temp lease creation in
GetRemotes()called from exporters, cache-exporting, and provenance creation and gets called for every cache result when walking the graph. 99% time it returns nil or reference to blob that already existed but temp lease is needed for the odd case where it needs to create new blobs to make sure the code does not go to race against containerd GC. Although it looks like creating a lease is justcontext.WithValueit is actually quite expensive as it is written into containerd boltdb. This improves performance in this case by creating a single temp lease for the whole export phase of a single job so calls insideGetRemotes()don't need to create their own one for safety.