Well, strictly speaking since it is an intermittent failure, we'll actually have to wait and see
But yes, I see improvement on the same machine and in the same test circumstances where pretty consistent intermittent failure was previously observed:
HDFS-1295 just passed auto-test without a TestBlockReport failure; whereas it had failed previously, and indeed it has been a long time since I saw TestBlockReport NOT be on the Hudson failure list for several HDFS bugs I was interested in.
Altho this is a single instance, I think we've got rational grounds for believing that we now understand the probable cause and have addressed it. Regrettably I can't test the failure locally – it doesn't fail on any machine I've tried it on here. The proof of the pudding will be seeing if the community stops being bothered by this false positive after it is submitted to the public code base.