Grant Henke created KUDU-3147:
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Summary: Balance tablets based on range hash buckets
Key: KUDU-3147
URL: https://issues.apache.org/jira/browse/KUDU-3147
Project: Kudu
Issue Type: Improvement
Components: master, perf
Affects Versions: 1.12.0
Reporter: Grant Henke
When a user defines a schema that uses range + hash partitioning its is often
the case that the tablets in the latest range, based on time or any
semi-sequential data, are the only tablets that receive writes. Or even if not
the latest, it is common for a single range to receive a burst of writes if
backloading.
This is so common, that the default Kudu balancing scheme should consider
placing/rebalancing the tablets for the hash buckets within each range on as
many servers as possible in order to support the maximum write throughput. In
that case, `min(#buckets, #total-cluster-tservers)` tservers will be used to
handle the writes if the cluster is perfectly balanced. Today, even if
perfectly balanced, it is possible for all the hash buckets to be on a single
tserver.
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