kgo: unlinger partitions in ProduceSync to avoid linger delay #1236
+157
−23
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ProduceSync now stops lingering and triggers an immediate drain on
all partitions that records were produced to. This avoids the caller
waiting unnecessarily for linger timers (default 10ms since v1.20.0)
when synchronously waiting for results.
After each Produce call, the record's Partition field is already set
(see bufferRecord), so we collect unique recBufs inline and unlinger
them after all records are enqueued. A [16]*recBuf stack array with
linear dedup avoids heap allocation in the common case.
Closes #1195