At 5 pm PDT on June 30, a leap second was added to the Universal Coordinated Time (UTC). Within an hour, Cloudera Support started receiving reports of systems running at 100% CPU utilization. The Support Team worked quickly to understand and diagnose the problem and soon published a solution. Bugs due to the leap second coupled with the Amazon Web Services outage would make this Cloudera’s busiest support weekend to date.
Since Hadoop is written in Java and closely interoperates with the underlying OS,