Re: high concurency issue with read-write on mysql table
InnoDB doesn't lock a whole table just to delete some rows. You might want to run Show Processlist to see what else is going on.
Big deletes chew up a lot of resources. Running Show InnoDB Engine status during the delete might show just how much. If an average row in your table takes up 200 bytes, innodb_buffer_pool_size needs to be > 4GB for your 20M rows to fit in memory. How much RAM does the machine have, what is innodb_buffer_pool_size? It should be about 75% of the RAM that's available to MySQL.
A common way to improve the performance of big deletes is chunking, see
http://mysql.rjweb.org/doc.php/deletebig.
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