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Review request for Ambari, Andrii Tkach, Dmytro Sen, Jaimin Jetly, Sumit Mohanty, and Sid Wagle. Bugs: AMBARI-15892 https://issues.apache.org/jira/browse/AMBARI-15892 Repository: ambari Description ------- Issue In the "NameNode HostLoad" graph, the negative values are seen for the computed metric "Memory Utilization" which goes by the formula : ( mem_total - (mem_free + mem_cache) ) *100 / mem_total Bug AMBARI-15448 changed the way memory metrics are being reported to AMS. This lead to a double subtraction of mem_cached, thereby leading to a negative value intermittently. Fix Change the widget to : ( mem_total - mem_free ) *100 / mem_total Diffs ----- ambari-server/src/main/java/org/apache/ambari/server/upgrade/UpgradeCatalog222.java 0476326 ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/widgets.json 0f8f105 ambari-server/src/main/resources/stacks/HDP/2.3/services/HDFS/widgets.json a19a112 Diff: https://reviews.apache.org/r/46219/diff/ Testing ------- Unit tests pass. Manual widget testing done. Manual upgrade testing pending. Thanks, Aravindan Vijayan