cpursley

PostgreSQL is Enough

• Simplify: move code into database functions
• Just Use Postgres for Everything
• Just use Postgres
• PostgreSQL is the worlds’ best database
• Postgres is eating the database world
• Hacker News discussion

Background and Cron Jobs

vinodkc

Spark HWC integration - HDP 3 Secure cluster

Prerequisites :

• Kerberized Cluster

• Enable hive interactive server in hive

• Get following details from hive for spark or try this HWC Quick Test Script

c-w

// define the name of the Azure Databricks notebook to run
val notebookToRun = ???

// define some way to generate a sequence of workloads to run
val jobArguments = ???

// define the number of workers per job
val workersPerJob = ???

import java.util.concurrent.Executors

enamoria

# This function is used to reduce memory of a pandas dataframe
# The idea is cast the numeric type to another more memory-effective type
# For ex: Features "age" should only need type='np.int8'
# Source: https://www.kaggle.com/gemartin/load-data-reduce-memory-usage
def reduce_mem_usage(df):
    """ iterate through all the columns of a dataframe and modify the data type
        to reduce memory usage.        
    """
    start_mem = df.memory_usage().sum() / 1024**2
    print('Memory usage of dataframe is {:.2f} MB'.format(start_mem))

ramiroaznar

Meta Gist

• PostgreSQL and PostGIS queries
• CartoCSS styles
• CARTO.js blocks
• DI.js blocks
• Leaflet.js blocks
• Other blocks
• Others

jdegoes

Applied Functional Programming with Scala - Notes

Copyright © 2016-2018 Fantasyland Institute of Learning. All rights reserved.

1. Mastering Functions

A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.

val square : Int => Int = x => x * x

hhimanshu

All exercises are attempted on https://coderpad.io

plastiv

• General
  • Mastering Observable - http://docs.couchbase.com/developer/java-2.0/observables.html
• Android
  • Grokking RxJava, Part 1-4 - http://blog.danlew.net/2014/09/15/grokking-rxjava-part-1/
  • Loading data from multiple sources with RxJava - http://blog.danlew.net/2015/06/22/loading-data-from-multiple-sources-with-rxjava/
  • Don't break the chain: use RxJava's compose() operator - http://blog.danlew.net/2015/03/02/dont-break-the-chain/
• Pro RxJava
  • Hot and Cold Observable - http://davesexton.com/blog/post/Hot-and-Cold-Observables.aspx
  • To use subject or not to use subject - http://davesexton.com/blog/post/To-Use-Subject-Or-Not-To-Use-Subject.aspx
• RxJava Threading Examples - http://www.grahamlea.com/2014/07/rxjava-threading-examples/

ericelliott

Essential JavaScript Links

I no longer mantain this list. There are lots of other very comprehensive JavaScript link lists out there. Please see those, instead (Google "awesome JavaScript" for a start).