in hadoop-testutils/src/main/java/org/apache/hadoop/hbase/oss/EmbeddedS3.java [117:123]
private void simulateServerSideCopy() {
try {
// For realism, this could be a function of data size, but 1/100s is
// more than enough to reliably observe non-atomic renames.
Thread.sleep(10);
} catch (InterruptedException e) {}
}