[GitHub] spark issue #23218: [SPARK-26266][BUILD] Update to Scala 2.12.8

[dongjoon-hyun]

Github user dongjoon-hyun commented on the issue:

    https://github.com/apache/spark/pull/23218
  
    This might be https://bugs.openjdk.java.net/browse/JDK-8136447 (which is 
resolved later by other issue)
    ```
    $ grep build_loop_late_post consoleFull*
    consoleFull.4451:# V  [libjvm.so+0x812e44]  
PhaseIdealLoop::build_loop_late_post(Node*)+0x144
    consoleFull.4451:# V  [libjvm.so+0x812e44]  
PhaseIdealLoop::build_loop_late_post(Node*)+0x144
    consoleFull.4452:# V  [libjvm.so+0x812e44]  
PhaseIdealLoop::build_loop_late_post(Node*)+0x144
    consoleFull.4452:# V  [libjvm.so+0x812e44]  
PhaseIdealLoop::build_loop_late_post(Node*)+0x144
    consoleFull.4452:# V  [libjvm.so+0x812e44]  
PhaseIdealLoop::build_loop_late_post(Node*)+0x144
    consoleFull.99679:# V  [libjvm.so+0x812e44]  
PhaseIdealLoop::build_loop_late_post(Node*)+0x144
    consoleFull.99679:# V  [libjvm.so+0x812e44]  
PhaseIdealLoop::build_loop_late_post(Node*)+0x144
    consoleFull.99679:# V  [libjvm.so+0x812e44]  
PhaseIdealLoop::build_loop_late_post(Node*)+0x144
    ```
    
    Our jenkins are using the following.
    ```
    JRE version: Java(TM) SE Runtime Environment (8.0_60-b27) (build )
    ```
    
    cc @shaneknapp 


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