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A comment on How To Survive a Ground-Up Rewrite.

Re:How To Survive a Ground-Up Rewrite by chiph on Monday April 08, 2013 @02:16PM (#5513479)
A lot of this rings (painfully) true.

In the past, we used subsets of data to test our migration tool. Always. ALWAYS, there was something bizarre in the the excluded subset that caused the migration to break.

[ Parent | on HN ]
Re:How To Survive a Ground-Up Rewrite by philsnow on Monday April 08, 2013 @05:50PM (#5514873)
Additionally, if your data is highly graph-structured and not trivially shard-able, merely selecting a valid subset can be complicated.
[ Parent | on HN ]