@Override
  protected void doInit(Configuration conf) throws IOException {
    Pair<EventLoopGroup, Class<? extends Channel>> eventLoopGroupAndChannelClass =
      NettyAsyncFSWALConfigHelper.getEventLoopConfig(conf);
    eventLoopGroup = eventLoopGroupAndChannelClass.getFirst();
    channelClass = eventLoopGroupAndChannelClass.getSecond();
  }
Protected visibility for used in tests.
hbase-server/src/main/java/org/apache/hadoop/hbase/wal/AsyncFSWALProvider.java