protected final void closeTableDescriptors() {
    if (this.tableDescriptors != null) {
      LOG.info("Close table descriptors");
      try {
        this.tableDescriptors.close();
      } catch (IOException e) {
        LOG.debug("Failed to close table descriptors gracefully", e);
      }
    }
  }
Sets the abort state if not already set.
@return True if abortRequested set to True successfully, false if an abort is already in
        progress.
hbase-server/src/main/java/org/apache/hadoop/hbase/HBaseServerBase.java