fix cache populate incorrect content when numBackgroundThreads>1#3943

Merged

nishantmonu51 merged 3 commits intoapache:masterfrom

kaijianding:cachebug

Feb 17, 2017

Commits on Feb 16, 2017

fix cache populate incorrect content when numBackgroundThreads>1
kaijianding
committed

Commits on Feb 17, 2017

simplify code by using Futures.allAsList and use CountDownLatch in UT
kaijianding
committed
fix test code style and assert countDownLatch.await()
kaijianding
committed