• This repository has been archived on 18/Dec/2019
  • Stars
    star
    507
  • Rank 87,068 (Top 2 %)
  • Language
    Ruby
  • License
    MIT License
  • Created almost 12 years ago
  • Updated almost 7 years ago

Reviews

There are no reviews yet. Be the first to send feedback to the community and the maintainers!

Repository Details

a top like tool for inspecting memcache key values in realtime

mctop is an Archived Prjoect

mctop is no longer actively maintained. Your mileage with patches may vary.

mctop

Inspired by "top", mctop passively sniffs the network traffic passing in and out of a server's network interface and tracks the keys responding to memcache get commands. The output is presented on the terminal and allows sorting by total calls, requests/sec and bandwidth.

You can read more detail about why this tool evovled over on our code as craft blog.

mctop depends on the ruby-pcap gem, if you don't have this installed you'll need to ensure you have the development pcap libraries (libpcap-devel package on most linux distros) to build the native gem.

How it works

mctop sniffs network traffic collecting memcache VALUE responses and calculates from traffic statistics for each key seen. It currently reports on the following metrics per key:

  • calls - the number of times the key has been called since mctop started
  • objsize - the size of the object stored for that key
  • req/sec - the number of requests per second for the key
  • bw (kbps) - the estimated network bandwidth consumed by this key in kilobits-per-second

Getting it running

the quickest way to get it running is to:

  • ensure you have libpcap-devel installed
  • git clone this repo
  • in the top level directory of this repo bundle install (this will install the deps)
  • then either:
    • install it locally rake install; or
    • run it from the repo (good for hacking) sudo ./bin/mctop --help

Command line options

Usage: mctop [options]
    -i, --interface=NIC              Network interface to sniff (required)
    -p, --port=PORT                  Network port to sniff on (default 11211)
        --host=HOST                  Network host to sniff on (default all)
    -d, --discard=THRESH             Discard keys with request/sec rate below THRESH
    -r, --refresh=MS                 Refresh the stats display every MS milliseconds
    -h, --help                       Show usage info

User interface commands

The following key commands are available in the console UI:

  • C - sort by number of calls
  • S - sort by object size
  • R - sort by requests/sec
  • B - sort by bandwidth
  • T - toggle sorting by ascending / descending order
  • Q - quits

Status bar

The following details are displayed in the status bar

  • sort mode - the current sort mode and ordering
  • keys - total number of keys in the metrics table
  • packets - packets received and dropped by libpcap (% is percentage of packets dropped)
  • rt - the time taken to sort and render the stats

Changelog

  • 2012-12-14 - Now compatible with Ruby 1.8.x (tested on 1.8.7-p371)

Known issues / Gotchas

ruby-pcap drops packets at high volume

from my testing the ruby-pcap native interface to libpcap struggles to keep up with high packet rates (in what we see on a production memcache instance) you can keep an eye on the packets recv/drop and loss percentage on the status bar at the bottom of the UI to get an idea of the packet

No binary protocol support

There is currently no support for the binary protocol. However, if someone is using it and would like to submit a patch, it would be welcome.

More Repositories

1

AndroidStaggeredGrid

An Android staggered grid view which supports multiple columns with rows of varying sizes.
Java
4,756
star
2

skyline

It'll detect your anomalies! Part of the Kale stack.
Python
2,135
star
3

logster

Parse log files, generate metrics for Graphite and Ganglia
Python
1,968
star
4

deployinator

Deployinate!
Ruby
1,878
star
5

morgue

post mortem tracker
PHP
1,017
star
6

411

An Alert Management Web Application
PHP
971
star
7

feature

Etsy's Feature flagging API used for operational rampups and A/B testing.
PHP
869
star
8

MIDAS

Mac Intrusion Detection Analysis System
833
star
9

opsweekly

On call alert classification and reporting
JavaScript
761
star
10

oculus

The metric correlation component of Etsy's Kale system
Java
707
star
11

supergrep

realtime log streamer
JavaScript
411
star
12

Conjecture

Scalable Machine Learning in Scalding
Java
361
star
13

statsd-jvm-profiler

Simple JVM Profiler Using StatsD and Other Metrics Backends
Java
330
star
14

nagios-herald

Add context to Nagios alerts
Ruby
322
star
15

dashboard

JavaScript
308
star
16

boundary-layer

Builds Airflow DAGs from configuration files. Powers all DAGs on the Etsy Data Platform
Python
262
star
17

Testing101

Etsy's educational materials on testing and design
PHP
262
star
18

DebriefingFacilitationGuide

Leading Groups at Etsy to Learn From Accidents
247
star
19

phpunit-extensions

Etsy PHPUnit Extensions
PHP
228
star
20

nagios_tools

Tools for use with Nagios
Python
173
star
21

open-api

We are working on a new version of Etsyโ€™s Open API and want feedback from developers like you.
166
star
22

TryLib

TryLib is a simple php library that helps you generate a diff of your working copy and send it to Jenkins to run the test suite(s) on the latest code patched with your changes.
PHP
155
star
23

BugHunt-iOS

Objective-C
148
star
24

mod_realdoc

Apache module to support atomic deploys - http://codeascraft.com/2013/07/01/atomic-deploys-at-etsy/
C
128
star
25

ab

Etsy's little framework for A/B testing, feature ramp up, and more.
128
star
26

wpt-script

Scripts to generate WebPagetest tests and download results
PHP
121
star
27

applepay-php

A PHP extension that verifies and decrypts Apple Pay payment tokens
C
118
star
28

foodcritic-rules

Etsy's foodcritic rules
Ruby
115
star
29

kevin-middleware

This is an Express middleware that makes developing javascript in a monorepo easier.
JavaScript
110
star
30

mixer

a tool to initiate meetings by randomly pairing individuals
Go
100
star
31

cloud-jewels

Estimate energy consumption using GCP Billing Data
TSQL
96
star
32

jenkins-master-project

Jenkins Plugin: Master Project. Jenkins project type that allows for selection of sub-jobs to execute, watch, and report worst status of all sub-projects.
Java
83
star
33

Sahale

A Cascading Workflow Visualizer
JavaScript
83
star
34

PushBot

An IRC Bot for organizing code pushes
Java
79
star
35

cdncontrol

CLI tool for working with multiple CDNs
Ruby
79
star
36

rules_grafana

Bazel rules for building Grafana dashboards
Starlark
70
star
37

chef-whitelist

Simple library to enable host based rollouts of changes
Ruby
68
star
38

rfid-checkout

Low Frequency RFID check out/in client for Raspberry Pi
Python
64
star
39

Etsy-Engineering-Career-Ladder

Etsy's Engineering Career Ladder
HTML
61
star
40

Evokit

Rust
60
star
41

ELK-utils

Utilities for working with the ELK (Elasticsearch, Logstash, Kibana) stack
Ruby
59
star
42

incpath

PHP extension to support atomic deploys
C
52
star
43

arbiter

A utility for generating Oozie workflows from a YAML definition
Java
48
star
44

VIPERBuilder

Scaffolding for building apps in a clean way with VIPER architecture
Swift
41
star
45

chef-handlers

Chef handlers we use at Etsy
Ruby
40
star
46

sbt-checkstyle-plugin

SBT Plugin for Running Checkstyle on Java Sources
Scala
32
star
47

es-restlog

Plugin for logging Elasticsearch REST requests
Java
29
star
48

yubigpgkeyer

Script to make RSA authentication key generation on Yubikeys differently painful
Python
28
star
49

Apotheosis

Python
28
star
50

jenkins-deployinator

Jenkins Plugin: Deployinator. Links key deployinator information to Jenkins builds via the CLI.
Java
25
star
51

sbt-compile-quick-plugin

SBT Plugin for Compiling a Single File
Scala
25
star
52

geonames

Scripts for using Geonames
PHP
24
star
53

jading

cascading.jruby build and execution tool
16
star
54

etsy.github.com

Etsy! on Github!
HTML
16
star
55

divertsy-client

The Android client for running DIVERTsy, a waste stream recording tool to help track diversion rates.
Java
13
star
56

cdncontrol_ui

A web UI for Etsy's cdncontrol tool
CSS
13
star
57

terraform-demux

A user-friendly launcher (ร  la bazelisk) for Terraform.
Go
12
star
58

logstash-plugins

Ruby
11
star
59

jenkins-triggering-user

Jenkins Plugin: Triggering User. Populates a $TRIGGERING_USER environment variable from the build cause and other sources, a best guess.
10
star
60

EtsyCompositionalLayoutBridge

iOS framework that allows for simultaneously leveraging flow layout and compositional layout in collection views
Swift
3
star
61

consulkit

Ruby API for interacting with HashiCorp's Consul.
Ruby
1
star
62

soft-circuits-workshop

Etsy Soft Circuits Workshop
Arduino
1
star