Mahesh Reddy created KUDU-3476:
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Summary: Make replica placement range and table aware
Key: KUDU-3476
URL: https://issues.apache.org/jira/browse/KUDU-3476
Project: Kudu
Issue Type: New Feature
Components: master, tserver
Reporter: Mahesh Reddy
Assignee: Mahesh Reddy
The current replica placement algorithm uses the power of two choices
algorithm. This algorithm randomly selects tservers and places the replica on
the tserver with less replicas. This can lead to potential hotspotting as it
doesn't discriminate by range or table so many tablets from the same
range/table can be disproportionally distributed.
With this new feature, the replicas will be placed in a way that the tablets
per range will be equally distributed amongst the available tservers. If
multiple tservers have the same amount of replicas per range, then the tserver
with less replicas for that table will be selected. If multiple tservers have
the same amount of replicas for that table, the tserver with less total
replicas will be chosen.
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