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Review request for Ambari, Dmytro Sen, Sumit Mohanty, and Sid Wagle. Bugs: AMBARI-15621 https://issues.apache.org/jira/browse/AMBARI-15621 Repository: ambari Description ------- Fix issues in aggregator scheduling implementation. Recommend value of "timeline.metrics.service.resultset.fetchSize" through stack advisor based on cluster size. Diffs ----- ambari-metrics/ambari-metrics-timelineservice/src/main/java/org/apache/hadoop/yarn/server/applicationhistoryservice/metrics/timeline/HBaseTimelineMetricStore.java 2f080e3 ambari-metrics/ambari-metrics-timelineservice/src/main/java/org/apache/hadoop/yarn/server/applicationhistoryservice/metrics/timeline/aggregators/AbstractTimelineAggregator.java f8ec516 ambari-metrics/ambari-metrics-timelineservice/src/test/java/org/apache/hadoop/yarn/server/applicationhistoryservice/metrics/timeline/aggregators/AbstractTimelineAggregatorTest.java 21b9839 ambari-server/src/main/resources/stacks/HDP/2.0.6/services/stack_advisor.py b8e2c45 Diff: https://reviews.apache.org/r/45447/diff/ Testing ------- Manually tested on a large cluster. Unit tests pass. Thanks, Aravindan Vijayan