MySQL Amazon RDS: Lock Timeout Exceeded

On Mysql (Amazon RDS), when I try to run the following SQL query

UPDATE
    table1 INNER JOIN table2 USING (CommonColumn)
SET
    table1.col1 = table2.x,
    table1.col2 = table2.y

I get this error after around 52 seconds consistently:

Error Code: 1205. Lock wait timeout exceeded; try restarting transaction

How should I resolve this?

table2 has around 17 million records and table2 which is a subset of table1 has 4 million records. Could it be the size of the tables that is the problem or is something wrong with my query?

On AWS RDS, I had a DB instance fill up, which caused this error on the client.

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