FRANCESCO CESARINI. presents ERLANG/OTP. Francesco Cesarini Erlang
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1 FRANCESCO CESARINI presents Francesco Cesarini Erlang Solutions
2
3 WHAT IS SCALABILITY?
4
5 WHAT IS (MASSIVE) CONCURRENCY?
6
7 WHAT IS HIGH AVAILABILITY?
8
9 WHAT IS FAULT TOLERANCE?
10
11 WHAT IS DISTRIBUTION TRANSPARENCY?
12
13 Do you need a distributed system? Do you need a scalable system? Do you need a reliable system? Do you need a fault-tolerant system? Do you need a massively concurrent system? Do you need a distributed system? Do you need a scalable YES, PLEASE!!! system? Do you need a reliable system? Do you need a fault-tolerant system? Do distributed system? Do you need a scalable system? Do you need a reliable system? Do you need a fault-tolerant system? Do you need a massively
14 TO THE RESCUE
15 OPEN SOURCE CONCURRENCY-ORIENTED LIGHTWEIGHT PROCESSES ASYNCHRONOUS MESSAGE PASSING SHARE-NOTHING MODEL PROCESS LINKING / MONITORING SUPERVISION TREES AND RECOVERY STRATEGIES TRANSPARENT DISTRIBUTION MODEL SOFT-REAL TIME LET-IT-FAIL PHILOSOPHY HOT-CODE UPGRADES WHAT IS ERLANG
16 WELL, IN FACT YOU NEED MORE.
17 ERLANG IS JUST A PROGRAMMING LANGUAGE.
18 YOU NEED ARCHITECTURE PATTERNS. YOU NEED MIDDLEWARE. YOU NEED LIBRARIES. YOU NEED TOOLS.
19 YOU NEED OTP.
20 SOME TEXT
21 WHAT IS MIDDLEWARE?
22 DESIGN PATTERNS FAULT TOLERANCE DISTRIBUTION UPGRADES PACKAGING MIDDLEWARE
23 WHAT ARE LIBRARIES?
24 STORAGE O&M INTERFACES COMMUNICATION LIBRARIES
25 WHAT TOOLS?
26 DEVELOPMENT TEST FRAMEWORKS RELEASE & DEPLOYMENT DEBUGGING & MONITORING OTP TOOLS
27 OPEN SOURCE OTP IS PART OF THE ERLANG DISTRIBUTION
28 Less Code Servers OTP Less Bugs More Solid Code More Tested Code More Free Time Finite State Machines Event Handlers Supervisors Applications
29 BEHAVIOURS
30 GENERIC BEHAVIOUR MODULE Server process SPECIFIC CALLBACK MODULE
31 Less Code Servers OTP Less Bugs More Solid Code More Tested Code More Free Time Finite State Machines Event Handlers Supervisors Applications
32 Client {request, Pid, Message} {reply, Reply} Server call(name, Message) -> Name! {request, self(), Message}, receive {reply, Reply} -> Reply end. reply(pid, Reply) -> Pid! {reply, Reply}.
33 Client {request, {request, {Ref, Pid, self()}, Message} Message} {reply, Ref, Reply} Reply} Server {reply,???, Reply} Reply} Server 2 call(name, Msg) -> Ref = make_ref(), Name! {request, {Ref, self()}, Msg}, receive {reply, Ref, Reply} -> Reply end. reply({ref, Pid}, Reply) -> Pid! {reply, Ref, Reply}.
34 {request, {Ref, PidA}, Msg} PidA PidB call(name, Msg) -> Ref = erlang:monitor(process, Name), Name! {request, {Ref, self()}, Msg}, receive! {reply, Ref, Reply} ->! erlang:demonitor(ref),! Reply;! {'DOWN', Ref, process, _Name, _Reason} ->! {error, no_proc} end.
35 PidA {'DOWN', Ref, process, PidB, Reason} {request, {Ref, PidA}, Msg} {reply, Ref, Reply} PidB call(name, Msg) -> Ref = erlang:monitor(process, Name), Name! {request, {Ref, self()}, Msg}, receive! {reply, Ref, Reply} ->! erlang:demonitor(ref, [flush]),! Reply;! {'DOWN', Ref, process, _Name, _Reason} ->! {error, no_proc} end.
36 TIMEOUTS DEADLOCKS TRACING MONITORING DISTRIBUTION BEHAVIOURS
37 Your Heading
38 convert(day) -> case Day of monday -> 1; tuesday -> 2; wednesday -> 3; thursday -> 4; friday -> 5; saturday -> 6; sunday -> 7; Other -> {error, unknown_day} end. Let It Fail
39 convert(day) -> case Day of monday -> 1; tuesday -> 2; wednesday -> 3; thursday -> 4; friday -> 5; saturday -> 6; sunday -> 7 Let It Fail end.
40 ISOLATE THE ERROR!
41 PidA PROPAGATING EXIT SIGNALS {'EXIT', PidA, Reason} {'EXIT', PidB, Reason} PidB Exit Signals PidC
42 PidA TRAPPING AN EXIT SIGNAL {'EXIT', PidA, Reason} PidB Trap Exit PidC
43 PidA Supervisor PidB Supervisors Workers Application PidC
44 Release Mongoose IM folsom lager Releases snmp mnesia stdlib SASL kernel ERTS
45 AUTOMATIC TAKEOVER AND FAILOVER
46 {myapp, 2000, N1 N2 N3 Application Master Application dies Application Masters on failover nodes
47 {myapp, 2000, N2 N3 Application is restarted on dies
48 {myapp, 2000, N1 N3 comes back up Application is restarted on
49 {myapp, 2000, N1 N3 N1 takes over N3
50 RELEASE STATEMENT OF AIMS To scale the radical concurrency-oriented programming paradigm to build reliable general-purpose software, such as serverbased systems, on massively parallel machines (10^5 cores).
51 Erlang VM Scheduler #1 Scheduler #2 Scheduler #N run queue run queue run queue migration logic The Runtime Queues
52
53 LIMITATIONS ARE PRESENT AT THREE LEVELS WP4 Scalable Infrastructure WP3 SD Erlang Language WP2 Virtual Machine WP5 Tools WP6 Case Studies
54 VM LANGUAGE INFRASTRUCTURE PUSH THE RESPONSIBILITY FOR SCALABILITY FROM THE PROGRAMMER TO THE VM ANALYZE PERFORMANCE AND SCALABILITY IDENTIFY BOTTLENECKS AND PRIORITIZE CHANGES AND EXTENSIONS TACKLE WELL-KNOWN SCALABILITY ISSUES ETS TABLES (SHARED GLOBAL DATA STRUCTURE) MESSAGE PASSING, COPYING AND FREQUENTLY COMMUNICATING PROCESSES
55 VM LANGUAGE INFRASTRUCTURE TWO MAJOR ISSUES FULLY CONNECTED CLUSTERS EXPLICIT PROCESS PLACEMENT SCALABLE DISTRIBUTED (SD) ERLANG NODES GROUPING NON-TRANSITIVE CONNECTIONS IMPLICIT PROCESS PLACEMENT PART OF THE STANDARD ERLANG/OTP PACKAGE NEW CONCEPTS INTRODUCED LOCALITY, AFFINITY AND DISTANCE
56 VM LANGUAGE INFRASTRUCTURE Wombat O&M MIDDLEWARE LAYER SET OF ERLANG APPLICATIONS CREATE AND MANAGE CLUSTERS OF (HETEROGENEOUS) ERLANG NODES API TO MONITOR AND CONTROL ERLANG DISTRIBUTED SYSTEMS EXISTING TRACING/LOGGING/DEBUGGING TOOLS PLUGGABLE BROKER LAYER BETWEEN USERS AND CLOUD PROVIDERS AUTO-SCALING... AND MUCH MORE
57 CONCLUSIONS
58 Do you need a distributed system? Do you need a scalable system? Do you need a reliable system? Do you need a fault-tolerant system? Do you need a massively concurrent system? Do you need a distributed system? Do you need a scalable USE ERLANG system? Do you need a reliable system? Do you need a fault-tolerant system? Do distributed system? Do you need a scalable system? Do you need a reliable system? Do you need a fault-tolerant system? Do you need a massively
59 Do you need a distributed system? Do you need a scalable system? Do you need a reliable system? Do you need a fault-tolerant system? Do you need a massively concurrent system? Do you need a distributed system? Do you need a scalable USE ERLANG/OTP system? Do you need a reliable system? Do you need a fault-tolerant system? Do distributed system? Do you need a scalable system? Do you need a reliable system? Do you need a fault-tolerant system? Do you need a massively
60
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