code: private void purgePaxosDecision(long segmentTxId) throws IOException {
      File paxosFile = journalStorage.getPaxosFile(segmentTxId);
      if (paxosFile.exists()) {
        if (!paxosFile.delete()) {
          throw new IOException("Unable to delete paxos file " + paxosFile);
        }
      }
    }
docs: Remove the previously-recorded 'accepted recovery' information
  for a given log segment, once it is no longer necessary.
  @param segmentTxId the transaction ID to purge
  @throws IOException if the file could not be deleted