private void export_meta_data(PreDropTableEvent tableEvent) throws MetaException {
    FileSystem fs = null;
    Table tbl = tableEvent.getTable();
    String name = tbl.getTableName();
    org.apache.hadoop.hive.ql.metadata.Table mTbl = new org.apache.hadoop.hive.ql.metadata.Table(
        tbl);
    IHMSHandler handler = tableEvent.getHandler();
    Configuration conf = handler.getConf();
    Warehouse wh = new Warehouse(conf);
    Path tblPath = new Path(tbl.getSd().getLocation());
    fs = wh.getFs(tblPath);
    Date now = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
    String dateString = sdf.format(now);
    String exportPathString = MetastoreConf.getVar(conf, MetastoreConf.ConfVars.METADATA_EXPORT_LOCATION);
    boolean moveMetadataToTrash = MetastoreConf
        .getBoolVar(conf, MetastoreConf.ConfVars.MOVE_EXPORTED_METADATA_TO_TRASH);
    Path exportPath = null;
    if (exportPathString != null && exportPathString.length() == 0) {
      exportPath = fs.getHomeDirectory();
    } else {
      exportPath = new Path(exportPathString);
    }
    Path metaPath = new Path(exportPath, name + "." + dateString);
    LOG.info("Exporting the metadata of table " + tbl.toString() + " to path "
        + metaPath.toString());
    try {
      fs.mkdirs(metaPath);
    } catch (IOException e) {
      throw new MetaException(e.getMessage());
    }
    Path outFile = new Path(metaPath, name + EximUtil.METADATA_NAME);
    try {
      SessionState.getConsole().printInfo("Beginning metadata export");
      EximUtil.createExportDump(fs, outFile, mTbl, null, null,
          new HiveConf(conf, MetaDataExportListener.class));
      if (moveMetadataToTrash == true) {
        wh.deleteDir(metaPath, true, false, false);
      }
    } catch (IOException | SemanticException e) {
      throw new MetaException(e.getMessage());
    }
  }
Export the metadata to a given path, and then move it to the user's trash
ql/src/java/org/apache/hadoop/hive/ql/parse/MetaDataExportListener.java