Todd Lipcon created KUDU-2855:
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Summary: Lazy-create DeltaMemStores on first update
Key: KUDU-2855
URL: https://issues.apache.org/jira/browse/KUDU-2855
Project: Kudu
Issue Type: Improvement
Components: perf, tserver
Reporter: Todd Lipcon
Currently DeltaTracker::DoOpen creates a DeltaMemStore for each DRS. If we
assume that most DRS don't have any deltas, this ends up wasting quite a bit of
memory. Looking at one TS in a production cluster, about 1GB of the ~14G heap
is being used by DMS. Of that, 464MB is data and the remainder is overhead.
This would likely improve other code paths too to fast-path out any DMS-related
code.
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