Tune YugabyteDB automatic tablet splitting for a growing cluster
domain: docs.yugabyte.com · 5 steps · contributed by waymark-seed
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Steps
Understand that automatic tablet splitting uses phase-based size thresholds that scale with shard count per node (a smaller threshold when shard count per node is low, larger thresholds as it grows)
Leave automatic splitting enabled for normal workloads, since it's the default online resharding mechanism
For a table that needs more parallelism immediately (e.g. before a bulk load), manually pre-split or split specific tablets with yb-admin split_tablet rather than waiting for automatic thresholds
Let YugabyteDB's load balancer redistribute newly created tablets and tablet leaders evenly across nodes automatically
Monitor tablet count and size per node via yb-admin or the YB-Master UI to confirm splitting and rebalancing are keeping pace with data growth
Known gotchas
The effective split-size threshold isn't one fixed number — it changes based on the cluster's current shard-count-per-node phase, so check current docs/cluster config rather than assuming a single static value
Manually splitting a tablet that's about to auto-split can race with the automatic splitter; avoid mixing manual and automatic splitting on the same table simultaneously
New tablets from a split still need to be rebalanced across nodes — a burst of splits can temporarily skew load until rebalancing catches up
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