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EVENT_S_SOME_SUBSCRIBERS_FAILED
COM+ event reached only some subscribers
EVENT_S_SOME_SUBSCRIBERS_FAILED is HRESULT 262656 (0x00040200) from winerror.h. AllStat describes this result as “An event was able to invoke some but not all of the subscribers.” The high-order severity bit is clear, so this is a success result, but it carries more information than plain S_OK.
The event publication completed, but one or more subscribers failed while at least one other subscriber was invoked successfully.
Evidence and telemetry to preserve
- preserve event class and interface method.
- preserve subscriber CLSIDs or identities.
- preserve per-subscriber HRESULT and error information.
- preserve delivery order and transaction context.
- preserve idempotency key or event correlation ID.
Also record event_s_some_subscribers_failed_operation, event_s_some_subscribers_failed_object, event_s_some_subscribers_failed_state_before, event_s_some_subscribers_failed_state_after, UTC time, process and thread identifiers, and a correlation ID. Keep secrets out of logs while retaining GUIDs, CLSIDs, media subtypes, property IDs, row identities, and hashes needed to distinguish objects.
Where the result is encountered
- This result can appear in COM+ loosely coupled events; record the producing interface and method rather than inferring behavior from the symbolic name alone.
- This result can appear in publisher calls through an event class; record the producing interface and method rather than inferring behavior from the symbolic name alone.
- It can appear in multi-subscriber notification where delivery results differ; record the producing interface and method rather than inferring behavior from the symbolic name alone.
The same numeric success value can be mishandled when a wrapper exposes only a Boolean. Keep the original HRESULT until the code-specific outputs and state transition have been evaluated.
State boundary that must be proved
The central question for it is whether the publisher knows which subscriber effects occurred before deciding whether retry is safe. The HRESULT alone confirms neither unrelated work nor the quality of optional outputs.
A reliable interpretation of it names the exact method contract, the object generation, and the outputs that remain valid. This prevents a success-with-information result from being promoted to full success or demoted to a generic error.
Diagnostic sequence
- capture the raw HRESULT
0x00040200immediately after the returning method and record whether the caller usedSUCCEEDED,FAILED, equality testing, or exception translation. - Identify the exact owner of it: interface, method, object instance, provider or filter version, thread or apartment, and operation phase.
- Validate the decisive contract boundary for it: the publisher knows which subscriber effects occurred before deciding whether retry is safe.
- inspect every output parameter, count, status array, returned interface, or side effect that the method documentation associates with this success-with-information result.
- Compare the observed state before and after it; do not assume that a success severity bit means every optional sub-operation completed.
- reproduce the smallest request with the same object state and then change only the condition identified by the evidence before repeating the operation.
Difference from nearby HRESULT values
EVENT_S_NOSUBSCRIBERS reports an empty subscriber set; it reports a mixed delivery outcome.
This distinction determines whether the caller should consume partial outputs, stop iteration, wait, reconfigure, notify the user, or perform no error recovery at all.
Correct handling, retry, and recovery
Do not republish blindly because successful subscribers may run twice. Retry failed subscribers through a deduplicated mechanism or reconcile the event state explicitly.
Retry it only when the recorded state can change the documented outcome. Repeating the same call is inappropriate for a stable end marker, cancellation, unsupported format, adjusted property, or partial result whose completed side effects have not been reconciled.
Practical validation scenario
A configuration event has five subscribers; four update successfully and one is offline. The publisher records the failed subscriber, queues a targeted retry with the event ID, and does not redeliver to the four completed consumers.
The negative test should preserve the condition that produces it; the recovery test should alter only that condition and verify the final state as well as the HRESULT.
Developer and administrator guidance
When it crosses process, RPC, scripting, or managed-code boundaries, preserve the unsigned 32-bit value and symbolic name. A signed decimal rendering can obscure that the severity bit indicates success and can lead to incorrect exception or retry behavior.
A support report for it should include decimal 262656, hexadecimal 0x00040200, the AllStat meaning, the owning API, and the first detailed status or output that explains why the method did not return ordinary S_OK.
References
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