@Override protected void encodeInProgress( BinaryEncoder encoder, Map<Long, TransactionManager.InProgressTx> inProgress) throws IOException { if (!inProgress.isEmpty()) { encoder.writeInt(inProgress.size()); for (Map.Entry<Long, TransactionManager.InProgressTx> entry : inProgress.entrySet()) { encoder.writeLong(entry.getKey()); // tx id encoder.writeLong(entry.getValue().getExpiration()); } } encoder.writeInt(0); // zero denotes end of list as per AVRO spec }