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

["Abhishek Girish (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-5303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15888913#comment-15888913 ] 

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.



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