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shankarshastri / LearnXInYMinProtocolBuffer.proto
Last active Oct 1, 2019
Self-Explanatory Protocol Buffer Lang Guide (CheatSheet)
View LearnXInYMinProtocolBuffer.proto
* Self-Explanatory Protocol Buffer Lang Guide
* Why Protocol Buffers?
* Protocol buffers are Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data – think XML, but smaller, faster, and simpler.
* You define how you want your data to be structured once, then you can use special generated source code to easily write and read your structured data to and from a variety of data streams and using a variety of languages.
* Protocol Buffers are Schema Of Messages. They are language agnostic.
Daenyth /
Last active Jun 13, 2019
Cheat sheet for common cats monad and fs2 operation shapes
Operation Input Result Notes
map F[A] , A => B F[B] Functor
apply F[A] , F[A => B] F[B] Applicative
(fa, fb, ...).mapN (F[A], F[B], ...) , (A, B, ...) => C F[C] Applicative
(fa, fb, ...).tupled (F[A], F[B], ...) F[(A, B, ...)] Applicative
flatMap F[A] , A => F[B] F[B] Monad
traverse F[A] , A => G[B] G[F[A]] Traversable; fa.traverse(f) ==; "foreach with effects"
sequence F[G[A]] G[F[A]] Same as fga.traverse(identity)
attempt F[A] F[Either[E, A]] Given ApplicativeError[F, E]
marwei /
Created Nov 9, 2017
How to Reset Kafka Consumer Group Offset

Kafka (Confluent 3.3.0) added support to manipulate offsets for a consumer group via cli kafka-consumer-groups command.

  1. List the topics to which the group is subscribed
kafka-consumer-groups --bootstrap-server <kafkahost:port> --group <group_id> --describe

Note the values under "CURRENT-OFFSET" and "LOG-END-OFFSET". "CURRENT-OFFSET" is the offset where this consumer group is currently at in each of the partitions.

  1. Reset the consumer offset for a topic (preview)

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

  1. CPU-bound
  2. Blocking IO
  3. Non-blocking IO polling

Each of these categories has a different optimal configuration and usage pattern.

View ClusterRouting.scala
import{Actor, ActorLogging, ActorRef, ActorSystem, Props}
import akka.cluster.{Cluster, MemberStatus}
import akka.routing.FromConfig
import com.typesafe.config.ConfigFactory
object ClusterRouting extends App {
class EchoActor extends Actor with ActorLogging {"Started")
def receive = {
raviwu /
Last active Dec 11, 2019
[Notes] Soft Skills: The software developer's life manual

Page 47

This kind of mindset is crucial to managing your career, because when you start to think of yourself as a business, you start to make good business decisions.

Page 52

Every step you take without a clear direction is a wasted step. Don’t randomly walk through life without a purpose for your career.

Your big goal should be something not too specific, but clear enough that you can know if you’re steering toward it or not. Think about what you want to ultimately do with your career.

anonymous / index.html
Created Dec 11, 2016
React Hello World w/ JSBin // source
View index.html
<!DOCTYPE html>
<script src=""></script>
<meta charset="utf-8">
<title>React Hello World w/ JSBin</title>
<div id="react_example"></div>
<script id="jsbin-javascript">
domfarolino /
Last active Apr 17, 2019
JavaScript Event Flow - A better understanding

This gist is deprecated and now exists here

This article is intended to further your knowledge of the various phases a DOM event goes through.

Great resources to refer to:


thesamet / ScalaPbSerializer.scala
Last active Aug 30, 2019
Akka serializer for ScalaPB messages
View ScalaPbSerializer.scala
package protoser
import java.util.concurrent.atomic.AtomicReference
import akka.serialization.BaseSerializer
import com.trueaccord.scalapb.GeneratedMessageCompanion
class ScalaPbSerializer(val system: ExtendedActorSystem) extends BaseSerializer {
private val classToCompanionMapRef = new AtomicReference[Map[Class[_], GeneratedMessageCompanion[_]]](Map.empty)
Faheetah / Jenkinsfile.groovy
Last active Dec 11, 2019
Jenkinsfile idiosynchrasies with escaping and quotes
View Jenkinsfile.groovy
node {
echo 'Results included as an inline comment exactly how they are returned as of Jenkins 2.121, with $BUILD_NUMBER = 1'
echo 'No quotes, pipeline command in single quotes'
sh 'echo $BUILD_NUMBER' // 1
echo 'Double quotes are silently dropped'
sh 'echo "$BUILD_NUMBER"' // 1
echo 'Even escaped with a single backslash they are dropped'
sh 'echo \"$BUILD_NUMBER\"' // 1
echo 'Using two backslashes, the quotes are preserved'
sh 'echo \\"$BUILD_NUMBER\\"' // "1"
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