.sync("a", Stage.PRE_BEGIN)
.sync("b", Stage.FINISH)
.mark(Stage.PRE_BEGIN, Stage.POST_COMMIT)
.build(this);
ThreadHelper.runAndCheck(threads);
new TimeMarkerComparison(threads).verify("Scan:PRE_BEGIN",
"DML:PRE_BEGIN",
"DML:POST_COMMIT",
"Scan:PRE_SCAN");
return threads;
}