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75851: kv: reduce kv.rangefeed.concurrent_catchup_iterators to 16 by default r=erikgrinaker a=stevendanna Many of our largest users have found the need to tune this parameter to lower values (often single-digit values). Here, I've lowered it to a new, unprincipled value of 16. Note that this limit is _per store_, so the actual number of concurrent catchup scans allowed on a given server can be some multiple of the value here. Release note: The default value of `kv.rangefeed_concurrent_catchup_iterators` has been lowered to 16 to help avoid overload during CHANGEFEED restarts. Co-authored-by: Steven Danna <[email protected]>
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