kangkaisen created KYLIN-1695: --------------------------------- Summary: disable cardinality calculation job when loading hive table Key: KYLIN-1695 URL: https://issues.apache.org/jira/browse/KYLIN-1695 Project: Kylin Issue Type: Bug Components: Job Engine Affects Versions: v1.5.1 Reporter: kangkaisen Assignee: Dong Li
When user loads/reloads hive tables from web console, kylin will submit a mr job asynchronously to calculate column cardinalities. This has four major problems: # the calculated cardinality is stored in table metadata, but never used in cubing/querying # table may change after loading, so the cardinality doesn't necessarily reflect the actual value # the current `HiveColumnCardinalityJob` has many limitations, e.g., it doesn't support views # the `HiveColumnCardinalityJob` may use lots of resources when computing cardinality of partitioned table Due to these problems, we should disable it by default and (maybe) remove it in future releases. -- This message was sent by Atlassian JIRA (v6.3.4#6332)