Hi, I found a news which has impacts against Hadoop:
http://www.infoq.com/news/2015/05/redhat-futex Quoting from the URL: “The impact of this kernel bug is very simple: user processes can deadlock and hang in seemingly impossible situations. A futex wait call (and anything using a futex wait) can stay blocked forever, even though it had been properly woken up by someone. Thread.park() in Java may stay parked. Etc. If you are lucky you may also find soft lockup messages in your dmesg logs. If you are not that lucky (like us, for example), you'll spend a couple of months of someone's time trying to find the fault in your code, when there is nothing there to find.” > RHEL 6 (and CentOS 6, and SL 6): 6.0-6.5 are good. 6.6 is BAD. 6.6.z is good. > RHEL 7 (and CentOS 7, and SL 7): 7.1 is BAD. As of yesterday. there does not > yet appear to be a 7.x fix. [May 13, 2015] > RHEL 5 (and CentOS 5, and SL 5): All versions are good (including 5.11). Thanks, - Tsuyoshi
