mihai-cazacu-adswizz edited a comment on issue #7119: [materialized view] The 
last day of month and the last 24h are not ingested by the Supervisor
URL: 
https://github.com/apache/incubator-druid/issues/7119#issuecomment-467847269
 
 
   I've just added some logging into that method and, when the Supervisor is 
created, the `sortedToBuildVersion` and `baseSegments` are empty.
   
   The base data source has only one day of data:
   
   ```
   2019-02-21T12 | 3 | 228 MB
   2019-02-21T11 | 23 | 1.8 GB
   2019-02-21T10 | 24 | 850 MB
   2019-02-21T09 | 12 | 240 MB
   ```
   and the Supervisor is not running because of the `hasEnoughLag` method which 
returns false:
   
   `return minDataLagMs <= (maxInterval.getStartMillis() - 
target.getStartMillis())`
   
   where
   
   ```
   minDataLagMs = 86400000
   maxInterval.getStartMillis() = 1550750400000
   target.getStartMillis() = 1550739600000
   ```

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