Setting an implementer during cluster merge or split‑brain recovery
could fail with SA_AIS_ERR_EXIST even though the coord accepted the new
implementer and the operation should be retried.
When this happens, visible symptoms include the imm agent timing out or
receiving a response that later leads to SA_AIS_ERR_EXIST on retries.
After a network merge, IMMND re-introduces and enters a sync phase with
the coordinator (mIntroduced == 2). While syncing, IMMND may drop the
set-implementer response but the coordinator can still accept and set the
implementer. This creates a mismatch: the imm agent either times out or
gets a stale/absent response, and when it retries the operation the IMMND
now reports SA_AIS_ERR_EXIST because the implementer is already set on
the coordinator.
Add an early check in case IMMND need to be synced with coord.
This prevents further processing while IMMND is syncing and makes
the retryable condition explicit so the agent can try again later.
---
src/imm/immnd/immnd_evt.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/src/imm/immnd/immnd_evt.c b/src/imm/immnd/immnd_evt.c
index 46cb85b31..088da129e 100644
--- a/src/imm/immnd/immnd_evt.c
+++ b/src/imm/immnd/immnd_evt.c
@@ -2888,6 +2888,13 @@ static uint32_t immnd_evt_proc_impl_set(IMMND_CB *cb,
IMMND_EVT *evt,
goto agent_rsp;
}
+ if (cb->mIntroduced == 2) {
+ TRACE_2("ERR_TRY_AGAIN: wait for IMMND sync up with coord");
+ send_evt.info.imma.info.implSetRsp.error =
+ SA_AIS_ERR_TRY_AGAIN;
+ goto agent_rsp;
+ }
+
if (evt->type == IMMND_EVT_A2ND_OI_IMPL_SET_2 &&
!immModel_protocol45Allowed(cb)) {
LOG_WA(
--
2.34.1
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