@InterfaceAudience.Private
  protected void kill() {
    this.killed = true;
    abort("Simulated kill");
  }
Cause the server to exit without closing the regions it is serving, the log it is using and
without notifying the master. Used unit testing and on catastrophic events such as HDFS is
yanked out from under hbase or we OOME. the reason we are aborting the exception that caused
the abort, or null
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java