upgrade D7 to D8 failing with mysql error (using web migration interface)

I am getting MYSQL error when trying to migrate from D7 to D8:
Specified key was too long; max key length is 1000 bytes: CREATE TABLE {migrate_map_58f7923f89f06} ( `source_ids_hash` VARCHAR(64) NOT NULL COMMENT 'Hash of source ids. Used as primary key', `sourceid1` VARCHAR(255) NOT NULL, `sourceid2` VARCHAR(255) NOT NULL, `sourceid3` VARCHAR(255) NOT NULL,

I can see this is some migration table that is just being created and I am not sure why the keys in it are too long.



GoSend is a global eCommerce and shipping company (package consolidation) enabling consumers around the world to buy products from retailers in the United States that are not shipped outside USA and save on sales tax and shipping costs. GoSend being still a startup project in its initial phase, approached Websolutions Agency with a decision already made to use Drupal to build a complete solution that provides warehouse management with all necessary integrations and eCommerce making the system almost fully automated.

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