{"id":2505,"date":"2017-01-23T15:24:50","date_gmt":"2017-01-23T15:24:49","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=2505"},"modified":"2023-06-21T05:42:57","modified_gmt":"2023-06-21T12:42:57","slug":"transferring-data-from-cassandra-to-couchbase-using-spark","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/es\/transferring-data-from-cassandra-to-couchbase-using-spark\/","title":{"rendered":"Transferencia de datos de Cassandra a Couchbase usando Spark"},"content":{"rendered":"

Shivansh Srivastava<\/span><\/a> es un desarrollador pol\u00edglota y aficionado a Scala y Spark.<\/span>\u00a0Le gusta contribuir a proyectos de c\u00f3digo abierto, y ha contribuido a muchos proyectos como Apache Iota, Apache Spark, Apache Carbondata, <\/span>Conector Couchbase-Spark<\/span><\/a>Akka, Alpakka y muchos otros proyectos. Tiene un gran inter\u00e9s en las pr\u00f3ximas tecnolog\u00edas como IoT, DeepLearning, etc. C<\/span><\/em>n la actualidad ocupa el puesto de Ingeniero de Software Senior en Chirpanywhere Inc, una startup basada en IoT, donde gestiona muchos aspectos, desde la programaci\u00f3n del hardware hasta el dise\u00f1o de toda la soluci\u00f3n y su despliegue.\u00a0<\/span><\/em><\/p>\n

Hay muchos <\/span>Bases de datos NoSQL<\/span> en el mercado como Cassandra, MongoDB, Couchbase y otros, y cada uno tiene pros y contras. <\/span><\/p>\n

Tipos de bases de datos NoSQL<\/span><\/p>\n

Existen principalmente cuatro tipos de bases de datos NoSQL, a saber:<\/span><\/p>\n

    \n
  1. \n

    Columna<\/span><\/p>\n<\/li>\n

  2. \n

    Almac\u00e9n de claves y valores<\/span><\/p>\n<\/li>\n

  3. \n

    Orientaci\u00f3n documental<\/span><\/p>\n<\/li>\n

  4. \n

    Gr\u00e1fico<\/span><\/p>\n<\/li>\n<\/ol>\n

    Las bases de datos que admiten m\u00e1s de un formato se denominan \"multimodelo\", como Couchbase, que admite bases de datos clave-valor y orientadas a documentos.<\/span><\/p>\n

    A veces elegimos la base de datos equivocada para nuestra aplicaci\u00f3n y nos damos cuenta de esta dura verdad m\u00e1s adelante.<\/span><\/p>\n

    \u00bfY despu\u00e9s? \u00bfQu\u00e9 debemos hacer?<\/span><\/p>\n

    Tal es el caso de nuestra experiencia, en la que utiliz\u00e1bamos Cassandra como base de datos y m\u00e1s tarde descubrimos que no satisfac\u00eda todas nuestras necesidades. Necesit\u00e1bamos encontrar una nueva base de datos y descubrimos que Couchbase era la adecuada.<\/span><\/p>\n

    La principal dificultad fue averiguar c\u00f3mo deb\u00edamos transferir nuestros datos de <\/span>De Cassandra a Couchbase<\/span>porque no hab\u00eda ning\u00fan plugin disponible.<\/span><\/p>\n

    En esta entrada del blog voy a describir el c\u00f3digo que escrib\u00ed que transfiere datos de Cassandra a Couchbase usando Spark.<\/span><\/p>\n

    Todo el c\u00f3digo est\u00e1 disponible aqu\u00ed: <\/span>cassandra-couchbase-transfer-plugin<\/span><\/a><\/p>\n

    Explicaci\u00f3n del c\u00f3digo<\/span><\/h2>\n


    Aqu\u00ed, estoy leyendo datos de Cassandra y escribi\u00e9ndolos de nuevo en Couchbase. Este sencillo c\u00f3digo resuelve nuestro problema.<\/span><\/p>\n

    Los pasos a seguir son:<\/span><\/p>\n

      \n
    1. \n

      Lectura de la configuraci\u00f3n: <\/span>
      val <\/span>config <\/span>= ConfigFactory.<\/span>carga<\/span>()<\/span>
      \/\/Configuraci\u00f3n de la base de datos<\/span>
      val <\/span>bucketName <\/span>= <\/span>config<\/span>.getString(<\/span>\"couchbase.bucketName\"<\/span>)<\/span>
      val <\/span>couchbaseHost <\/span>= <\/span>config<\/span>.getString(<\/span>\"couchbase.host\"<\/span>)<\/span>
      \/\/Configuraci\u00f3n de Cassandra<\/span>
      val <\/span>keypaceName <\/span>= <\/span>config<\/span>.getString(<\/span>\"cassandra.keyspaceName\"<\/span>)<\/span>
      val <\/span>tableName <\/span>= <\/span>config<\/span>.getString(<\/span>\"cassandra.tableName\"<\/span>)<\/span>
      val <\/span>idFeild <\/span>= <\/span>config<\/span>.getString(<\/span>\"cassandra.idFeild\"<\/span>)<\/span>
      val <\/span>cassandraHost <\/span>= <\/span>config<\/span>.getString(<\/span>\"cassandra.host\"<\/span>)<\/span>
      val <\/span>cassandraPort <\/span>= <\/span>config<\/span>.getInt(<\/span>\"cassandra.port\"<\/span>)<\/span><\/p>\n<\/li>\n

    2. \n

      Establecimiento de la configuraci\u00f3n de Spark y creaci\u00f3n de la sesi\u00f3n de Spark:<\/span>
      val <\/span>conf <\/span>= <\/span>nuevo <\/span>SparkConf()<\/span>
      \u00a0\u00a0.setAppName(<\/span>s \"CouchbaseCassandraTransferPlugin\"<\/span>)<\/span>
      \u00a0.setMaster(<\/span>\"local[*]\"<\/span>)<\/span>
      \u00a0.set(<\/span>s \"com.couchbase.bucket.<\/span>$<\/span>bucketName<\/span>“<\/span>, <\/span>“”<\/span>)<\/span>
      \u00a0.set(<\/span>\"com.couchbase.nodes\"<\/span>, <\/span>couchbaseHost<\/span>)<\/span>
      \u00a0.set(<\/span>\"spark.cassandra.connection.host\"<\/span>, <\/span>cassandraHost<\/span>)<\/span>
      \u00a0.set(<\/span>\"spark.cassandra.connection.port\"<\/span>, <\/span>cassandraPort<\/span>.toString)<\/span>
      val <\/span>chispa <\/span>= SparkSession.<\/span>constructor<\/span>().config(<\/span>conf<\/span>).getOrCreate()<\/span>
      val <\/span>sc <\/span>= <\/span>chispa<\/span>.sparkContext<\/span><\/p>\n<\/li>\n

    3. \n

      Lectura de datos de Cassandra:<\/span>
      \u00a0\u00a0<\/span>val <\/span>cassandraRDD <\/span>= <\/span>chispa<\/span>.leer<\/span>
      \u00a0\u00a0.format(<\/span>\"org.apache.spark.sql.cassandra\"<\/span>)<\/span>
      \u00a0\u00a0.opciones(<\/span>Mapa<\/span>(<\/span>\"mesa\" <\/span>-> <\/span>tableName<\/span>, <\/span>\"espacio clave\" <\/span>-> <\/span>keypaceName<\/span>))<\/span>
      \u00a0\u00a0.load()<\/span><\/p>\n<\/li>\n

    4. \n

      Comprobaci\u00f3n del campo id:<\/span>
      El campo id se comprueba para ver si existe. Luego se usa como id en Couchbase o se genera un id aleatorio y se asigna al documento.<\/span>
      importar <\/span>org.apache.spark.sql.functions._<\/span>
      val <\/span>uuidUDF <\/span>= <\/span>udf<\/span>(CouchbaseHelper.<\/span>getUUID <\/span>_)<\/span>
      val <\/span>rddToBeWritten <\/span>= <\/span>si <\/span>(<\/span>cassandraRDD<\/span>.columns.contains(<\/span>idFeild<\/span>)) {<\/span>
      \u00a0\u00a0<\/span>cassandraRDD<\/span>.withColumn(<\/span>\"META_ID\"<\/span>, <\/span>cassandraRDD<\/span>(<\/span>idFeild<\/span>))<\/span>
      } <\/span>si no <\/span>{<\/span>
      \u00a0\u00a0<\/span>cassandraRDD<\/span>.withColumn(<\/span>\"META_ID\"<\/span>, <\/span>uuidUDF<\/span>())<\/span>
      }<\/span>

      En otro archivo:<\/span>
      objeto <\/span>CouchbaseHelper {<\/span>
      def <\/span>getUUID: <\/span>Cadena <\/span>= UUID.<\/span>randomUUID<\/span>().toString<\/span>
      }<\/span><\/p>\n<\/li>\n

    5. \n

      Escribir en Couchbase:<\/span>
      rddToBeWritten<\/span>.write.couchbase()<\/span><\/p>\n<\/li>\n<\/ol>\n

      Puedes ejecutar este c\u00f3digo directamente para transferir datos de Cassandra a Couchbase <\/span>-<\/span> todo lo que necesitas hacer es alguna configuraci\u00f3n.<\/span><\/p>\n

      Configuraciones<\/span><\/h2>\n

      Todas las configuraciones se pueden realizar mediante la configuraci\u00f3n de los par\u00e1metros <\/span>variables de entorno<\/span>.<\/span><\/p>\n

        \n
      1. \n

        Configuraci\u00f3n de Couchbase:<\/span><\/p>\n<\/li>\n<\/ol>\n

        \n\n\n\n\n\n
        \n

        Nombre de la configuraci\u00f3n<\/span><\/p>\n<\/td>\n

        		\n

        Valor por defecto<\/span><\/p>\n<\/td>\n

        		\n

        Descripci\u00f3n<\/span><\/p>\n<\/td>\n<\/tr>\n

        \n

        COUCHBASE_URL<\/span><\/p>\n<\/td>\n

        		\n

        \"localhost\"<\/span><\/p>\n<\/td>\n

        		\n

        El nombre de host para Couchbase.<\/span><\/p>\n<\/td>\n<\/tr>\n

        \n

        COUCHBASE_BUCKETNAME<\/span><\/p>\n<\/td>\n

        		\n

        \"foobar\"<\/span><\/p>\n<\/td>\n

        		\n

        El nombre del cubo al que deben transferirse los datos.<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

          \n
        1. \n

          Configuraci\u00f3n de Cassandra:<\/span><\/p>\n<\/li>\n<\/ol>\n

          \n\n\n\n\n\n\n\n\n
          \n

          Nombre de la configuraci\u00f3n<\/span><\/p>\n<\/td>\n

          		\n

          Valor por defecto<\/span><\/p>\n<\/td>\n

          		\n

          Descripci\u00f3n<\/span><\/p>\n<\/td>\n<\/tr>\n

          \n

          CASSANDRA_URL<\/span><\/p>\n<\/td>\n

          		\n

          \"localhost\"<\/span><\/p>\n<\/td>\n

          		\n

          El nombre de host para Cassandra.<\/span><\/p>\n<\/td>\n<\/tr>\n

          \n

          PUERTO DE CASANDRA<\/span><\/p>\n<\/td>\n

          		\n

          9042<\/span><\/p>\n<\/td>\n

          		\n

          El puerto para el Cassandra.<\/span><\/p>\n<\/td>\n<\/tr>\n

          \n

          NOMBRE_CLAVE_CASSANDRA<\/span><\/p>\n<\/td>\n

          		\n

          \"foobar\"<\/span><\/p>\n<\/td>\n

          		\n

          El nombre del espacio de claves de Cassandra<\/span><\/p>\n<\/td>\n<\/tr>\n

          \n

          CASSANDRA_TABLENAME<\/span><\/p>\n<\/td>\n

          		\n

          \"testcouchbase\"<\/span><\/p>\n<\/td>\n

          		\n

          El nombre de la tabla que debe transferirse.<\/span><\/p>\n<\/td>\n<\/tr>\n

          \n

          CASSANDRA_ID_FEILD_NAME<\/span><\/p>\n<\/td>\n

          		\n

          \"id\"<\/span><\/p>\n<\/td>\n

          		\n

          El nombre del campo que debe usarse como id del documento de Couchbase, si el nombre del campo no coincide con ninguna columna da un id aleatorio al documento.<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

           <\/p>\n

          C\u00f3digo en acci\u00f3n<\/span><\/h2>\n

          Cassandra lado:<\/span><\/p>\n

          As\u00ed es como se ven los datos en el lado de Cassandra.<\/span><\/p>\n

          \"Cassandra1.png\"<\/span><\/p>\n

          Lado Couchbase:<\/span><\/p>\n

          Caso 1: <\/span>Cuando el id existe y el mismo puede ser usado como id de documento Couchbase.<\/span><\/p>\n

          \"Couchbase_with_id.png\"<\/span><\/p>\n

          Caso 2: <\/span>Cuando el nombre del identificador no existe y necesitamos asignar un identificador aleatorio a los documentos.<\/span>\"Couchbase_idChanged.png\"<\/span><\/p>\n

          C\u00f3mo ejecutar el plugin de transferencia Cassandra-Couchbase<\/span><\/h2>\n

          Pasos para ejecutar el c\u00f3digo:<\/span><\/p>\n

            \n
          1. \n

            Descarga el c\u00f3digo del repositorio.<\/span><\/p>\n<\/li>\n

          2. \n

            Configure las variables de entorno de acuerdo con la configuraci\u00f3n.<\/span><\/p>\n<\/li>\n

          3. \n

            Ejecute el proyecto con <\/span>ejecutar sbt<\/span><\/span><\/p>\n<\/li>\n<\/ol>\n

            Si desea escribir sobre Couchbase y participar en nuestro programa de escritura de la comunidad, \u00bfpor qu\u00e9 no? m\u00e1s informaci\u00f3n\u00a0<\/a><\/p>","protected":false},"excerpt":{"rendered":"

            Shivansh Srivastava is a polyglot developer and a Scala ,Spark aficionado\u00a0He likes to contribute to Open Source projects, and has contributed to many projects like, Apache Iota, Apache Spark, Apache Carbondata, Couchbase-Spark-Connector, Akka, Alpakka and many other projects. He has […]<\/p>","protected":false},"author":53,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1816],"tags":[],"ppma_author":[9026],"class_list":["post-2505","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-couchbase-server"],"acf":[],"yoast_head":"\nTransferring Data From Cassandra to Couchbase Using Spark<\/title>\n<meta name=\"description\" content=\"This post focuses on the code that transfers data from Cassandra to Couchbase using Spark. Check out how to configure and run the transfer plugin.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.couchbase.com\/blog\/es\/transferring-data-from-cassandra-to-couchbase-using-spark\/\" \/>\n<meta property=\"og:locale\" content=\"es_MX\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Transferring Data From Cassandra to Couchbase Using Spark\" \/>\n<meta property=\"og:description\" content=\"This post focuses on the code that transfers data from Cassandra to Couchbase using Spark. 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