I create a schema and i add 1TB data to druid schema. then the log file version was upgraded and new two columns was added. then i want to add that data to druid schema. but couldn't yet.
In order to add a new column to existing datasource you need to follow the below steps:
Go to the Tasks menu in druid console.
From the listed datasources, go to the 'Actions' column in the last of the datasource in which you want to add the column.
There will be a magnifying glass like button, click on that to copy the existing payload.
Copy the payload in notepad and add the 2 columns to "dimensions" array.
Copy the updated payload and submit it via Submit Supervisor button.
You'll find the new columns in the datasource which you can verify by querying the datasource in query section of druid.
Related
Am using Azure DataFlow - DerivedColumn to create some new columns.
Ex:
this is my source and can preview the data.
But from DerivedColumn1 i cannot see these column or even in Expression Editor
Expression Editor:
Is something changed in ADF or am I doing something wrong.
According you screenshot, the column name is set as the row. Or you will get the error in Sink column mapping. Please set "first row as header" in the excel dataset.
If you don't check it, the column name will be considered as first row:
For your issue, you could try bellow workarounds:
import the source schema in Projection and Delete the Derived column
active and add again.
Drop the data flow and create a new one. Some time data flow may
have bugs, we refresh the browser or just recreate the data flow, it
will be solved.
I create a schema and i add 1TB data to druid schema. then the log file version was upgraded and new two columns was added. then i want to add that data to druid schema. but couldn't yet.
In order to add a new column to existing datasource you need to follow the below steps:
Go to the Tasks menu in druid console.
From the listed datasources, go to the 'Actions' column in the last of the datasource in which you want to add the column.
There will be a magnifying glass like button, click on that to copy the existing payload.
Copy the payload in notepad and add the 2 columns to "dimensions" array.
Copy the updated payload and submit it via Submit Supervisor button.
You'll find the new columns in the datasource which you can verify by querying the datasource in query section of druid.
I'm designing a Copy Data task where the Sink SQL Server table contains an Identity column. The Copy Data task always wants me to map that column when, in my opinion, it should just not include the column in the list of columns to map. Does anyone know how I can get the ADF Copy Data task to ignore Sink Identity columns?
If you are using copy data tool, and in your sql server, the ID is set as auto-increment, then it should not show out at the mapping step. Please tell us if it is not the case.
If you are using the create pipeline/dataset, you could just go to the sink dataset schema tab, remove the id column. And then go to the copy activity mapping tab, click import schemes again. ID column should has disappeared now.
You could include a SET_IDENTITY_INSERT_ON statement for the given table before executing the copy step. After completed, set it to OFF.
I have one already existing Talend Open Studio tMySQLInput component with some sql code inside it, in order to retrieve some joined columns linked to a tMySQLOuput component (pointing to an already existing MySQL table) with few records.
QUESTION:
Will the "tMySQLInput" component overwrite the already existing table data that the tMySQLOutput component relates to? I mean is there an option to check in the tMySQLInput our output in order to say, overwrite each time this job is executed ?
Thank you all.
Yes, there is an option where in tMySQLOutput where you can specify what action you want to do to your table. Follow following steps:
Go to component tab of tMySQLOutput, it will open the basic settings of this component.
If you will look closer you will find Action on table. This is the action which you can perform on the table which is pointed by tMySQLOutput. It has options as Default, Drop and Create Table etc.
Then you have Action on data. These are the options which you can perform on the data like Insert, Update etc.
In your case I suppose you can choose Action on Table as Default and Action on Data as Insert. Default action would not do anything on the table and Insert option would insert the records at the end of table. But in case of Insert if you will have duplicate rows then job would stop the moment it will find any duplicate row.
I need to add a new column to an existing table, I know I could create a new model and migrate the data over but that wouldn't be idle any other way?
Unfortunately the only other way is to use some administration tool for your database to manually update the schema to match the one for the new model.