HADOOP-9691 minor improvement CASSANDRA-228 major improvement
Sample 10 issues of hadoop, all bugs minor 1 major 2 critical 5 blocker 2
Select example edit pairs through code or commit log analysis. Assign concurrency control related node with high weights. Lase learns from multiple examples. We need classify or cluster examples first. Or learn context and edit from each example like sydit then try to match a new piece of code and apply edit. Reserve type, abstract name. Project-depentent or not. Programers modified some codes in the project, but they forgot to modify all the occurrence for some reasons. We give advice.