[DRILL-5303] Drillbits fail to start when Drill server built with JDK 8 is deployed on a JDK 7 environment

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.9.0
• Component/s: Server, Tools, Build & Test
• Assignee: Unassigned
• Reporter: Abhishek Girish
• Created: 28/Feb/17 21:23
• Updated: 07/Mar/17 23:59

Description

When Drill is built on a node configured with JDK 8 and is then deployed in a JDK 7 environment, Drillbits fail to start and the following errors are seen in Drillbit.out:

Exception in thread "main" java.lang.NoSuchMethodError: java.util.concurrent.ConcurrentHashMap.keySet()Ljava/util/concurrent/ConcurrentHashMap$KeySetView;
        at org.apache.drill.exec.coord.ClusterCoordinator.drillbitRegistered(ClusterCoordinator.java:85)
        at org.apache.drill.exec.coord.zk.ZKClusterCoordinator.updateEndpoints(ZKClusterCoordinator.java:266)
        at org.apache.drill.exec.coord.zk.ZKClusterCoordinator.start(ZKClusterCoordinator.java:135)
        at org.apache.drill.exec.server.Drillbit.run(Drillbit.java:117)
        at org.apache.drill.exec.server.Drillbit.start(Drillbit.java:292)
        at org.apache.drill.exec.server.Drillbit.start(Drillbit.java:272)
        at org.apache.drill.exec.server.Drillbit.main(Drillbit.java:268)

Workaround is to match the Java versions of build and deployment environments.