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(Updated Feb. 5, 2015, 6:32 p.m.) Review request for zookeeper, michim, Raul Gutierrez Segales, and Camille Fournier. Bugs: ZOOKEEPER-1907 https://issues.apache.org/jira/browse/ZOOKEEPER-1907 Repository: zookeeper Description ------- Improve the thread handling mechanism by detecting if any of the critical thread dies. Here the idea is to periodically checking the status of all the critical threads in ZK server using DeathWatcherThread. Diffs (updated) ----- ./src/java/main/org/apache/zookeeper/server/ExitCode.java PRE-CREATION ./src/java/main/org/apache/zookeeper/server/PrepRequestProcessor.java 1657623 ./src/java/main/org/apache/zookeeper/server/SessionTrackerImpl.java 1657623 ./src/java/main/org/apache/zookeeper/server/SyncRequestProcessor.java 1657623 ./src/java/main/org/apache/zookeeper/server/ZooKeeperCriticalThread.java 1657623 ./src/java/main/org/apache/zookeeper/server/ZooKeeperServer.java 1657623 ./src/java/main/org/apache/zookeeper/server/ZooKeeperServerListener.java PRE-CREATION ./src/java/main/org/apache/zookeeper/server/quorum/CommitProcessor.java 1657623 ./src/java/main/org/apache/zookeeper/server/quorum/FollowerRequestProcessor.java 1657623 ./src/java/main/org/apache/zookeeper/server/quorum/FollowerZooKeeperServer.java 1657623 ./src/java/main/org/apache/zookeeper/server/quorum/LeaderSessionTracker.java 1657623 ./src/java/main/org/apache/zookeeper/server/quorum/LeaderZooKeeperServer.java 1657623 ./src/java/main/org/apache/zookeeper/server/quorum/LearnerSessionTracker.java 1657623 ./src/java/main/org/apache/zookeeper/server/quorum/LearnerZooKeeperServer.java 1657623 ./src/java/main/org/apache/zookeeper/server/quorum/LocalSessionTracker.java 1657623 ./src/java/main/org/apache/zookeeper/server/quorum/ObserverRequestProcessor.java 1657623 ./src/java/main/org/apache/zookeeper/server/quorum/ObserverZooKeeperServer.java 1657623 ./src/java/main/org/apache/zookeeper/server/quorum/ProposalRequestProcessor.java 1657623 ./src/java/main/org/apache/zookeeper/server/quorum/ReadOnlyRequestProcessor.java 1657623 ./src/java/main/org/apache/zookeeper/server/quorum/ReadOnlyZooKeeperServer.java 1657623 ./src/java/main/org/apache/zookeeper/server/quorum/UpgradeableSessionTracker.java 1657623 ./src/java/test/org/apache/zookeeper/server/PrepRequestProcessorTest.java 1657623 ./src/java/test/org/apache/zookeeper/server/SessionTrackerTest.java 1657623 ./src/java/test/org/apache/zookeeper/server/ZooKeeperThreadTest.java 1657623 ./src/java/test/org/apache/zookeeper/server/quorum/CommitProcessorConcurrencyTest.java 1657623 ./src/java/test/org/apache/zookeeper/server/quorum/CommitProcessorTest.java 1657623 ./src/java/test/org/apache/zookeeper/test/ClientBase.java 1657623 ./src/java/test/org/apache/zookeeper/test/SessionTrackerCheckTest.java 1657623 Diff: https://reviews.apache.org/r/20071/diff/ Testing ------- yet to be inlcuded Thanks, Rakesh R