code: public static void validateAllAvroSchemas(SerializerDefinition avroSerDef) {
          Map<Integer, String> schemaVersions = avroSerDef.getAllSchemaInfoVersions();
          if(schemaVersions.size() < 1) {
              throw new VoldemortException("No schema specified");
          }
          for(Map.Entry<Integer, String> entry: schemaVersions.entrySet()) {
              Integer schemaVersionNumber = entry.getKey();
              String schemaStr = entry.getValue();
              try {
                  Schema.parse(schemaStr);
              } catch(Exception e) {
                  throw new VoldemortException("Unable to parse Avro schema version :"
                                               + schemaVersionNumber + ", schema string :"
                                               + schemaStr);
              }
          }
      }
docs: Given an AVRO serializer definition, validates if all the avro schemas
  are valid i.e parseable.
  
  @param avroSerDef