Lag Spikes in low-traffic when split the large table
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Description
We've observed lag spikes in TiCDC in low-traffic environments when split the large table.
Logs show specific dispatchers stalling for extended periods (e.g., ~1 minute) without receiving events.
This stalling makes them the "slowest" dispatcher, blocking the overall checkpointTs advancement and significantly increasing replication lag for the changefeed.
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