@Override
  public void fromData(DataInput in) throws IOException, ClassNotFoundException {
    membershipID = DataSerializer.readByteArray(in);
    threadID = in.readLong();
  }
checks to see if the membership id of this identifier is the same as in the argument

@return whether the two IDs are from the same member
geode-core/src/main/java/org/apache/geode/internal/cache/ha/ThreadIdentifier.java