Monitoring heap memory usage

You can use several ways to monitor the heap memory usage: Cloudera Manager, NameNode web UI, or the command line.

  • Cloudera Manager: Look at the NameNode chart for heap memory usage. If you need to build the chart from scratch, run:
    select jvm_max_memory_mb, jvm_heap_used_mb where roleType="NameNode"
  • NameNode Web UI: Scroll down to the Summary and look for "Heap Memory used."
  • Command line: Generate a heap dump.