Shaofeng SHI created KYLIN-2243:
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Summary: TopN memory estimation is inaccurate in some cases
Key: KYLIN-2243
URL: https://issues.apache.org/jira/browse/KYLIN-2243
Project: Kylin
Issue Type: Bug
Reporter: Shaofeng SHI
Fix For: Backlog
TopNCounterSerializer.maxLength() and
TopNCounterSerializer.getStorageBytesEstimate() might be inaccurate, especially
when there are multiple "group by" columns in one TopN measure and some uses
long bytes encoding like "fixed_length:16"
The inaccurate estimation may cause memory issue when using in-mem cubing, and
will cause the estimation on final cube size inaccurate.
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