The Hadoop Data Nodes Layer

Using the tests mapped to this layer, you can:

  • Identify overloaded and slow DataNodes in the cluster;
  • Be alerted if any DataNode does not send heartbeats to the NameNode or is taking too much time to do so;
  • Pinpoint DataNodes that are not effectively utilizing their off-heap memory;
  • Monitor block reporting and cache reporting operations of each DataNode, and capture abnormalities (if any)

Figure 1 : The tests mapped to the Hadoop Data Nodes layer