void addOp(Object key, TXEntryState entry) {
      if (opKeys == null) {
        opKeys = new ArrayList<>(maxSize);
        opEntries = new ArrayList<>(maxSize);
      }
      opKeys.add(key);
      opEntries.add(entry);
    }
Apply a single tx entry op on the far side
geode-core/src/main/java/org/apache/geode/internal/cache/TXCommitMessage.java