question Re: Best way to import a database into impala in Support Questions

Best way to import a database into impala

drgenious — Tue, 07 Jan 2020 16:49:42 GMT

Hi,

I have a database and i want to find the best way to import it into impala. Please help me.

Re: Best way to import a database into impala

robbiez — Thu, 09 Jan 2020 23:22:51 GMT

Impala shares metadata and data with Hive. You can use sqoop to import the tables from your database into hive. Don't forget to run 'invalidate metadata' in Impala after the ingestion is done. Otherwise, you can't see the imported tables.

Re: Best way to import a database into impala

drgenious — Thu, 06 Feb 2020 09:15:50 GMT

@robbiez

Thanks for your answer, but I want also to ask something.

If I have a big amount of data which are to be parsed and something goes wrong in the process of parsing, the parsing will start from the zero or I can do something in order to start again from the part which crashed the process?

Re: Best way to import a database into impala

robbiez — Fri, 07 Feb 2020 12:13:43 GMT

If a sqoop job failed/crashed in the middle of importing a table, the table is imported. When you run this job again, it will start from zero so you need to clear the partially imported data first.

Alternatively, if you know which rows are not imported yet, you can use the WHERE clause when you restart the job to import the rest rows.