Pair<File, FileChannel> getView() {
    refCount.incrementAndGet();
    return segmentView;
  }
Gets the {@link File} and {@link FileChannel} backing this log segment. Also increments a ref count.
<p/>
The expectation is that a matching {@link #closeView()} will be called eventually to decrement the ref count.
@return the {@link File} and {@link FileChannel} backing this log segment.
ambry-store/src/main/java/com/github/ambry/store/LogSegment.java