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tablets: load_balancer: Allow splits even if table stats not available

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This is in preparation for using the sizing plan during table creation
where we never have size stats, and hints are the only determining
factor for target tablet count.
This commit is contained in:
Tomasz Grabiec
2025-02-11 21:23:55 +01:00
parent d3ffea77e6
commit 35192e2d6f
1 changed files with 11 additions and 1 deletions
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12
service/tablet_allocator.cc
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@@ -1105,10 +1105,20 @@ public:
}
table_plan.avg_tablet_size = avg_tablet_size;
} else {
// When we don't have tablet size info, allow tablet count to increase but not to decrease.
// Increasing will always bring us closer to the true target count, since tablet_count_from_size
// can only increase the count above it, but decreasing may go against the true target count
// if tablet_count_from_size would demand more tablets.
if (tablet_count < min_tablet_count) {
// TODO: extend to n-way split when needed
target_tablet_count = min_tablet_count;
decision = resize_decision::split{};
}
}
table_plan.target_tablet_count = target_tablet_count;
table_plan.target_tablet_count_aligned = target_tablet_count;
table_plan.target_tablet_count_aligned = 1u << log2ceil(target_tablet_count);
table_plan.resize_decision = decision;
lblogger.debug("make_sizing_plan: table={}.{}, id={}, tablet_count={}, avg_tablet_size={}, min_tablet_count={}, target_tablet_count={}: decision={}",