Bill Havanki bhavanki

💭

Flossing

Marylander, Segmenter / Twilion, Go / Java nerd, likes big transforming robots.

bhavanki / groovynotes.md

Created August 13, 2013 15:40

Notes on transitioning from Java to Groovy

Notes on Groovy

class Duck {
  def walk() { println "I'm a duck, I walk" }
  def swim() { println "I'm a duck, I swim" }
  def quack() { println "QUACK" }
}

class Person {

bhavanki / Sieve.java

Created August 26, 2013 20:42

Java implementation of Sieve of Eratosthenes

	import java.util.List;

	public class Sieve {
	static List<Integer> sieve(int n) {
	List<Integer> l = new java.util.ArrayList<Integer>();
	byte[] bs = new byte[(n / 8) + 1]; // 0 => maybe prime
	bs[0] = (byte) 0xc0; // skip 0 and 1
	for (int i = 2; i <= n / 2; i++) {
	for (int c = i; c <= n; c += i) {
	int bidx = c / 8;

bhavanki / gitprompt.sh

Last active December 21, 2015 23:29

.bashrc snippet to include the current Git branch in the prompt

	parse_git_branch() {
	git branch --no-color 2>/dev/null \| sed -e '/^[^]/d' -e 's/ $.*$/ \1 /'
	}

	gitps1() {
	local GREEN="\[\033[0;32m\]"
	local DEFAULT="\[\033[0m\]"
	PS1="[\u@\h \W]$GREEN\$(parse_git_branch)$DEFAULT\$ "
	}
	gitps1

bhavanki / makeapp.sh

Last active January 2, 2016 14:29 — forked from demonbane/makeapp.sh

Chrome SSB generation script. Modifications since forking: - support for spaces in app name

	#!/bin/sh

	echo "What should the Application be called (e.g. GCal)?"
	read inputline
	name="$inputline"

	echo "What is the url (e.g. https://www.google.com/calendar/render)?"
	read inputline
	url="$inputline"

bhavanki / MetadataTableUtilTesting.java

Created March 20, 2014 15:32

An example of using a factory class to improve testability over a static method call.

	/*
	* Current getMetadataTable() method. This is hard to test because it requires a real HdfsZooInstance object.
	*/
	public synchronized static Writer getMetadataTable(Credentials credentials) {
	Writer metadataTable = metadata_tables.get(credentials);
	if (metadataTable == null) {
	metadataTable = new Writer(HdfsZooInstance.getInstance(), credentials, MetadataTable.ID);
	metadata_tables.put(credentials, metadataTable);
	}
	return metadataTable;

bhavanki / gist:e6e21ea15cf5670ba534

Created May 27, 2014 22:18

Out-of-memory stack traces when writing and scanning Accumulo rows of 100 cells with 100 MB values in each cell

	Observed in monitor:

	Unexpected throwable while invoking!
	java.lang.OutOfMemoryError: Java heap space
	at java.util.Arrays.copyOf(Arrays.java:2786)
	at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:94)
	at org.apache.thrift.transport.TFramedTransport.write(TFramedTransport.java:146)
	at org.apache.thrift.protocol.TCompactProtocol.writeBinary(TCompactProtocol.java:342)
	at org.apache.thrift.protocol.TCompactProtocol.writeBinary(TCompactProtocol.java:337)
	at org.apache.accumulo.core.data.thrift.TKeyValue$TKeyValueStandardScheme.write(TKeyValue.java:465)

bhavanki / master-protect-pre-push

Created March 10, 2015 21:09

Protects origin/master from your screwed-up pushes

	#!/bin/bash

	protected_branch='master'
	current_branch=$(git symbolic-ref HEAD \| sed -e 's,./$.$,\1,')

	remote_name=$1
	if [[ $remote_name != "origin" ]]; then
	exit 0
	fi

bhavanki / director_install.sh

Last active September 25, 2017 17:39

A bash script for installing Cloudera Director. If you are feeling adventurous, use curl to pipe it into bash. Otherwise, download and run.

	#!/usr/bin/env bash

	# Copyright 2017 William A. Havanki, Jr.

	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#

bhavanki / resume.json

Last active July 6, 2019 18:57

bhavanki / Bash.markdown

Created November 4, 2021 21:33

My cheat sheet for helpful Bashisms

readarray -t var < <(command)

var=()
while IFS= read -r line; do
  var+=( "$line" )