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Review request for Ambari, Aravindan Vijayan, Dmytro Sen, and Sumit Mohanty. Bugs: AMBARI-15902 https://issues.apache.org/jira/browse/AMBARI-15902 Repository: ambari Description ------- Presently metadata is served from a write through cache, we need a bounded cache that gets refreshed periodically to allow sharded writes to succeed. Additionally the metadata cache needs ability to skip certain metrics, example: YARN Container metrics with too many unique names using a config. Diffs ----- ambari-metrics/ambari-metrics-timelineservice/src/main/java/org/apache/hadoop/yarn/server/applicationhistoryservice/metrics/timeline/TimelineMetricConfiguration.java 5b517ef ambari-metrics/ambari-metrics-timelineservice/src/main/java/org/apache/hadoop/yarn/server/applicationhistoryservice/metrics/timeline/discovery/TimelineMetricMetadataManager.java 8e58203 ambari-metrics/ambari-metrics-timelineservice/src/main/java/org/apache/hadoop/yarn/server/applicationhistoryservice/metrics/timeline/discovery/TimelineMetricMetadataSync.java 54ea200 ambari-metrics/ambari-metrics-timelineservice/src/test/java/org/apache/hadoop/yarn/server/applicationhistoryservice/metrics/timeline/discovery/TestMetadataManager.java bf887be ambari-metrics/ambari-metrics-timelineservice/src/test/java/org/apache/hadoop/yarn/server/applicationhistoryservice/metrics/timeline/discovery/TestMetadataSync.java PRE-CREATION ambari-server/src/main/java/org/apache/ambari/server/upgrade/UpgradeCatalog240.java ddaff84 ambari-server/src/main/resources/common-services/AMBARI_METRICS/0.1.0/configuration/ams-site.xml e5758bf ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/templates/hadoop-metrics2.properties.j2 6f32000 Diff: https://reviews.apache.org/r/46238/diff/ Testing ------- All metrics Unit tests passed. Thanks, Sid Wagle