@Override
  public Void call() throws Exception {
    synchronized (fs) {
      String tezLibs = conf.get(TezConfiguration.TEZ_LIB_URIS);
      if (tezLibs == null) {
        LOG.warn("Missing tez.lib.uris in tez-site.xml");
      }
      if (LOG.isDebugEnabled()) {
        LOG.debug("Copying tez libs from " + tezLibs);
      }
      rawFs.mkdirs(tezDir);
      fs.copyToLocalFile(new Path(tezLibs), new Path(libDir, "tez.tar.gz"));
      CompressionUtils.unTar(new Path(libDir, "tez.tar.gz").toString(), tezDir.toString(), true);
      rawFs.delete(new Path(libDir, "tez.tar.gz"), false);
    }
    return null;
  }
Download tez related jars for the tarball.
llap-server/src/java/org/apache/hadoop/hive/llap/cli/service/AsyncTaskDownloadTezJars.java