Monthly Archives: April 2017

s3:// vs s3n:// vs s3a:// vs EMRFS

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s3://

Apache Hadoop implementation of a block-based filesystem backed by S3. Apache Hadoop has deprecated use of this filesystem as of May 2016.

s3n://

A native filesystem for reading and writing regular files on S3. S3N allows Hadoop to access files on S3 that were written with other tools, and conversely, other tools can access files written to S3N using Hadoop. S3N is stable and widely used, but it is not being updated with any new features. S3N requires a suitable version of the jets3t JAR on the classpath.

  • Uses jets3t

s3a://

Hadoop’s successor to the S3N filesystem. S3A uses Amazon’s libraries to interact with S3. S3A supports accessing files larger than 5 GB, and it provides performance enhancements and other improvements. For Apache Hadoop, S3A is the successor to S3N and is backward compatible with S3N. Using Apache Hadoop, all objects accessible from s3n:// URLs should also be accessible from S3A by replacing the URL scheme.

  • Uses AWS SDK.
  • Amazon EMR does not currently support use of the Apache Hadoop S3A file system.

EMRFS:

On Amazon EMR, both the s3:// and s3n:// URIs are associated with the EMR filesystem and are functionally interchangeable in the context of Amazon EMR. For consistency sake, however, it is recommended to use the s3:// URI in the context of Amazon EMR.

EMRFS can be used by invoking the prefix s3n:// or s3:// or s3a:// depending on the client application implementation.

Source: https://aws.amazon.com/premiumsupport/knowledge-center/emr-file-system-s3/

Cruz asador casera / Homemade Argentine asado cross

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Estas cruces son dificiles de conseguir afuera de Argentina. O son muy caras si las van a comprar.

Aqui algunos detalles de como contruir una facilmente.

Conseguimos un par the barras planas de acero de 1/4″ x 1″ x 48″.

acero_1-4_1_48

Dejamos una de las barras para el eje vertical de la cruz, y cortamos la otra barra a la mitad (unas 24″), para los dos brazos horizontales.

cruz_asador_ayudantes

Perforamos la barra vertical:

  • a unas 4″ desde la parte superior
  • a unas 10″ desde la parte inferior

Perforamos las barras horizontales:

  • en el centro de cada una para ser atornillada a la barra vertical
  • a una pulgada del borde de cada una para pasar el alambre para atar el cordero o lechon o lo que querramos cocinar con ella.

cruz_asador_perforando_acero

Le damos forma de flecha a la barra vertical en la parte de abajo para que sea mas facil colocarla en la tierra.

Sujetamos las barras horizontales a la barra vertical con tornillo y tuerca (1/4″ x 1/2″ en este caso)

cruz_asador_final

Y finalmente la probamos:

cruz_asador_prueba_cordero.jpeg

“Lástima que quedo crudo…” diria mi abuelo

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