Impact of Limpware on HDFS: A Probabilistic Estimation

With the advent of cloud computing, thousands of machines are connected and managed collectively. This era is confronted with a new challenge: performance variability, primarily caused by large-scale management issues such as hardware failures, software bugs, and configuration mistakes. In our previous work [2] we highlighted one overlooked cause: limping hardware – hardware whose performance degrades significantly compared to its specification. We showed that limping hardware can cause many limping scenarios in current scale-out systems. In this report, we quantify how often these scenarios happen in the Hadoop Distributed File System.