How to find optimal number of mappers when running Sqoop import and export?
问题 I'm using Sqoop version 1.4.2 and Oracle database. When running Sqoop command. For example like this: ./sqoop import \ --fs <name node> \ --jt <job tracker> \ --connect <JDBC string> \ --username <user> --password <password> \ --table <table> --split-by <cool column> \ --target-dir <where> \ --verbose --m 2 We can specify --m - how many parallel tasks do we want Sqoop to run (also they might be accessing Database at same time). Same option is available for ./sqoop export <...> Is there some