Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Ignore duplicate client requests #379

Merged
merged 4 commits into from
Apr 16, 2024
Merged

Ignore duplicate client requests #379

Changes from all commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
0c97fbc
filter duplicate client requests
sebastianburckhardt Apr 12, 2024
3c47c25
Update src/DurableTask.Netherite/PartitionState/PrefetchState.cs
sebastianburckhardt Apr 15, 2024
76121c0
fix whitespace
sebastianburckhardt Apr 15, 2024
795dd18
address PR feedback: add warning when event is dropped
sebastianburckhardt Apr 15, 2024
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
22 changes: 16 additions & 6 deletions src/DurableTask.Netherite/PartitionState/PrefetchState.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -74,13 +74,23 @@ public override void Process(WaitRequestReceived waitRequestEvent, EffectTracker
void ProcessClientRequestEventWithPrefetch(ClientRequestEventWithPrefetch clientRequestEvent, EffectTracker effects)
{
if (clientRequestEvent.Phase == ClientRequestEventWithPrefetch.ProcessingPhase.Read)
{
this.Partition.Assert(!this.PendingPrefetches.ContainsKey(clientRequestEvent.EventIdString), "PendingPrefetches.ContainsKey(clientRequestEvent.EventIdString)");

// Issue a read request that fetches the instance state.
// We have to buffer this request in the pending list so we can recover it.
{
// It's possible for EventHubs to duplicate client-to-partition events. Therefore, we perform a best-effort
// de-duplication of EH messages. For more details, see: https://github.com/microsoft/durabletask-netherite/pull/379
if (!this.PendingPrefetches.ContainsKey(clientRequestEvent.EventIdString))
{
// Issue a read request that fetches the instance state.
// We buffer this request in the pending list so we can recover it, and can filter duplicates
// (as long as the duplicates appear soon after the original)

this.PendingPrefetches.Add(clientRequestEvent.EventIdString, clientRequestEvent);
this.PendingPrefetches.Add(clientRequestEvent.EventIdString, clientRequestEvent);
}
else
{
// this is a duplicate. Ignore it.
effects.EventTraceHelper?.TraceEventProcessingWarning($"Dropped duplicate client request {clientRequestEvent} id={clientRequestEvent.EventIdString}");
return;
}
}
else
{
Expand Down