himanshushukla254 opened a new issue #8966: Issue while updating the data in Datasource URL: https://github.com/apache/incubator-druid/issues/8966 I am currently using the druid-Incubating-0.16.0 version. As mentioned in [https://druid.apache.org/docs/latest/tutorials/tutorial-update-data.html](https://druid.apache.org/docs/latest/tutorials/tutorial-update-data.html) tutorial link, we can use combining firehose to update and merge the data for a data source. **Step : 1** I am using the same sample data with initial structure as ``` ┌──────────────────────────┬──────────┬───────┬────────┐ │ __time │ animal │ count │ number │ ├──────────────────────────┼──────────┼───────┼────────┤ │ 2018-01-01T01:01:00.000Z │ tiger │ 1 │ 100 │ │ 2018-01-01T03:01:00.000Z │ aardvark │ 1 │ 42 │ │ 2018-01-01T03:01:00.000Z │ giraffe │ 1 │ 14124 │ └──────────────────────────┴──────────┴───────┴────────┘ ``` Step 2: I updated the data for **tiger** with **{"timestamp":"2018-01-01T01:01:35Z","animal":"tiger", "number":30} with appendToExisting = false and rollUp = true** and found the result ``` ┌──────────────────────────┬──────────┬───────┬────────┐ │ __time │ animal │ count │ number │ ├──────────────────────────┼──────────┼───────┼────────┤ │ 2018-01-01T01:01:00.000Z │ tiger │ 2 │ 130 │ │ 2018-01-01T03:01:00.000Z │ aardvark │ 1 │ 42 │ │ 2018-01-01T03:01:00.000Z │ giraffe │ 1 │ 14124 │ └──────────────────────────┴──────────┴───────┴────────┘ ``` Step 3: Now i am updating **giraffe** with **{"timestamp":"2018-01-01T03:01:35Z","animal":"giraffe", "number":30} with appendToExisting = false and rollUp = true** and getting the following result ┌──────────────────────────┬──────────┬───────┬────────┐ │ __time │ animal │ count │ number │ ├──────────────────────────┼──────────┼───────┼────────┤ │ 2018-01-01T01:01:00.000Z │ tiger │ 1 │ 130 │ │ 2018-01-01T03:01:00.000Z │ aardvark │ 1 │ 42 │ │ 2018-01-01T03:01:00.000Z │ giraffe │ 2 │ 14154 │ └──────────────────────────┴──────────┴───────┴────────┘ My doubt is, **In step 3 the count of tiger is getting decreased by 1 but i think it should not be changed since there are no changes in step 2 for tiger.** Please clarify.
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