How much is good salary to ask in Malaysia if iam getting 20lpa in India ,skills - Data engineer ( ADF, Databricks) ,yoe-6

Malaysian salaries are anywhere from 20-50% more compared to Indian counterparts due to base levels being higher and cost of living also being higher especially if you work in central cities like KL.

It is quite subjective though, and not easy to crack because of first preference given to locals and Chinese people.