@Override
  public void process() {
    try {
      scanner.seek(keyValue);
    } catch (IOException e) {
      LOG.error("", e);
      setErr(e);
    } finally {
      latch.countDown();
    }
  }
Handler to seek storefiles in parallel.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/handler/ParallelSeekHandler.java