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Abhishek Girish commented on DRILL-5303: ---------------------------------------- A brief note shared by [~adityakishore]: ConcurrentHashMap implementation changes in Java 8 are one of the few instance of implementation leaking into interface and causing such incompatibility. Note that you can compile with JDK-8 with source and target set to 1.7 and still hit this issue. Another reference link shared by Karthik: https://gist.github.com/AlainODea/1375759b8720a3f9f094 > Drillbits fail to start when Drill server built with JDK 8 is deployed on a > JDK 7 environment > --------------------------------------------------------------------------------------------- > > Key: DRILL-5303 > URL: https://issues.apache.org/jira/browse/DRILL-5303 > Project: Apache Drill > Issue Type: Bug > Components: Server, Tools, Build & Test > Affects Versions: 1.9.0 > Reporter: Abhishek Girish > > 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: > {code} > 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) > {code} > Workaround is to match the Java versions of build and deployment environments. -- This message was sent by Atlassian JIRA (v6.3.15#6346)