HBase

Learn about the known issues in HBase, the impact or changes to the functionality, and the workaround.

CDPD-77399: HBase fails to register the servlet metrics and throws ClassNotFoundException: org.apache.hadoop.metrics.MetricsServlet

The MetricsServlet class is a Hadoop 2-based metric servlet unavailable in Hadoop 3 deployments.

Workaround: Ignore this WARN log message during HBase Master and RegionServer startup.

Apache Issue: HBASE-28315