public static CombinedAsyncWriter create(AsyncWriter writer, AsyncWriter... writers) {
    return new CombinedAsyncWriter(
      ImmutableList.<AsyncWriter> builder().add(writer).add(writers).build());
  }
An {@link AsyncWriter} wrapper which writes data to a set of {@link AsyncWriter} instances.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/CombinedAsyncWriter.java