cheethoe

# This will use osd.5 as an example
# ceph commands are expected to be run in the rook-toolbox
1) disk fails
2) remove disk from node
3) mark out osd. `ceph osd out osd.5`
4) remove from crush map. `ceph osd crush remove osd.5`
5) delete caps. `ceph auth del osd.5`
6) remove osd. `ceph osd rm osd.5`
7) delete the deployment `kubectl delete deployment -n rook-ceph rook-ceph-osd-id-5`
8) delete osd data dir on node `rm -rf /var/lib/rook/osd5`

EronWright

Configure Mesos

These instructions are derived from those in the Mesos Community Documentation.

Do the below as root.

Install

cat <<EOF >> /etc/apt/sources.list.d/mesosphere.list
deb http://repos.mesosphere.com/ubuntu xenial main

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

xuwei-k

val buildFiles = SettingKey[Map[File, Seq[Byte]]]("build-files")

buildFiles := getBuildFiles((baseDirectory in ThisBuild).value) 

def getBuildFiles(base: File) =
  ((base * "*.sbt") +++ ((base / "project") ** ("*.scala" | "*.sbt"))).get.map{
    f => f -> collection.mutable.WrappedArray.make[Byte](Hash(f))
  }.toMap

def changed(base: File, files: Map[File, Seq[Byte]]): Boolean =

xcambar

Copyright (c) 2015 - Xavier Cambar <@ xcambar_gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD