private void serializeVersionTag(int entryVersion, long regionVersion,
      VersionSource versionMember, long timestamp, int dsId, DataOutput out) throws IOException {
    int memberId = getParent().getDiskInitFile().getOrCreateCanonicalId(versionMember);
    InternalDataSerializer.writeSignedVL(entryVersion, out);
    InternalDataSerializer.writeUnsignedVL(regionVersion, out);
    InternalDataSerializer.writeUnsignedVL(memberId, out);
    InternalDataSerializer.writeUnsignedVL(timestamp, out);
    InternalDataSerializer.writeSignedVL(dsId, out);
  }
Method to be used only for testing

@param ch Object to replace the channel in the Oplog.crf
@return original channel object
geode-core/src/main/java/org/apache/geode/internal/cache/Oplog.java