MongoDB now sets the default time window to 30 minutes. As a result, updates on the update chain in WiredTiger are highly unlikely to become obsolete within this time frame. Performing the update chain obsolete check for garbage collection often ends up being unnecessary and largely wasted effort.

As demonstrated in the experiment outlined in WT-16819, enabling skip_update_obsolete_check (i.e., disabling the update chain obsolete check) for disaggregated storage not only reduces this wasted work but also minimizes forced eviction. Forced eviction often occurs due to the obsolete check identifying too many updates associated with a single key in WiredTiger.