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(Updated Oct. 27, 2015, 9:14 p.m.) Review request for Aurora, Maxim Khutornenko and Bill Farner. Bugs: AURORA-1510 https://issues.apache.org/jira/browse/AURORA-1510 Repository: aurora Description (updated) ------- ClusterStateImpl exposes a synchronized multimap which does not have a thread-safe implementation of `keySet`. This patch revises the `ClusterState` interface to offer more precise operations and modifies `ClusterStateImpl` to makes all of these operations thread safe. Diffs ----- src/main/java/org/apache/aurora/scheduler/preemptor/ClusterState.java ce3bc7e6da3f86625c690e26c28ccef67ed9021a src/main/java/org/apache/aurora/scheduler/preemptor/ClusterStateImpl.java 42e2ca49b3c5de997cb5363e3518512d0f5a725e src/main/java/org/apache/aurora/scheduler/preemptor/PendingTaskProcessor.java 506176769e172b7e9f4ba05c486fe6ab550fb5c3 src/test/java/org/apache/aurora/scheduler/preemptor/PendingTaskProcessorTest.java 49002d03b190b8642b6251f4d1fbd6663ee6becc Diff: https://reviews.apache.org/r/39670/diff/ Testing ------- ./gradlew build -Pq If the approach is good, I can update this with benchmark information. Thanks, Zameer Manji