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Review request for Ambari, Andrew Onischuk and Dmytro Grinenko. Bugs: AMBARI-17026 https://issues.apache.org/jira/browse/AMBARI-17026 Repository: ambari Description ------- *Steps* # Deploy HDP-2.4.2.0 with Ambari 2.4.0.0-630 # Start EU to 2.5.0.0-639 *Result* NPE at "Update Target Stack" {code} java.lang.NullPointerException at org.apache.ambari.server.controller.internal.UpgradeResourceProvider.applyStackAndProcessConfigurations(UpgradeResourceProvider.java:1114) at org.apache.ambari.server.serveraction.upgrades.UpdateDesiredStackAction.updateDesiredStack(UpdateDesiredStackAction.java:180) at org.apache.ambari.server.serveraction.upgrades.UpdateDesiredStackAction.execute(UpdateDesiredStackAction.java:121) at org.apache.ambari.server.serveraction.ServerActionExecutor$Worker.execute(ServerActionExecutor.java:555) at org.apache.ambari.server.serveraction.ServerActionExecutor$Worker.run(ServerActionExecutor.java:492) at java.lang.Thread.run(Thread.java:745) {code} Diffs ----- ambari-server/src/main/java/org/apache/ambari/server/state/PropertyInfo.java 6ea7983 ambari-server/src/test/java/org/apache/ambari/server/state/PropertyInfoTest.java e55058f Diff: https://reviews.apache.org/r/48202/diff/ Testing ------- mvn clean test Thanks, Dmitro Lisnichenko