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I don't think it's very easy with comment line.
My advice is to use a comment column
Your file would be
You can read only key and value columns with your tFileInputDelimited before your tContextLoad
What would you like to do? Just ignore the comments? How do you know its a comment (line starting with "#" for example)?
In this case you may use a filter.
Please give us some more information to help you.
Here is a sample of the csv file, I used a comment column and it is ignored by the tContextLoad:
mysql_host;0.0.0.0;MySQL IP adress
mysql_db;talend;MySQL database name
It works perfectly now. Thanks.