Akka_ Simpler Scalability Tolerance, Con Currency _ Remoting Through Actors Presentation

8/8/2019 Akka_ Simpler Scalability Tolerance, Con Currency _ Remoting Through Actors Presentation

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Writing correct concurrentapplications is too hard

Scaling out applications is

too hard

Writing highly fault-tolerant

applications is too hard

We believe that...

Tuesday, July 20, 2010


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...sometimes

plain evilTuesday, July 20, 2010


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...but always the

wrong defaultTuesday, July 20, 2010


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Threads are to Concurrency asWitchcraft is to Physics

Hanging by a thread is the punishmentfor Shared State Concurrency

- Gilad Bracha



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Actorsone tool in the toolbox



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Implements Message-Passing Concurrency

Share!NOTHING Isolated lightweight processes

Communicates through messages

Asynchronous and non-blocking

Each actor has a mailbox (message queue)

Actor Model of

Concurrency



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Actor Model of

Concurrency Easier to reason about

Raised abstraction level Easier to avoid

Race conditions

Deadlocks

Starvation

Live locks



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Introducing

STM

Persistent

Distributed

RESTful Secure

Agents

Dataflow Open Source

Actors



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ARCHITECTURE

ENTERPRISE

MODULES



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Two different models

Thread-based

Event-based

Very!lightweight (600 bytes per actor) Can easily create!millions!on a single

workstation (6.5 million on 4 G RAM)

Does not consume a thread



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!"#$%&'($!)!"#$%

!*"##!&'()*+,!$+)$,-#!-$*',!.

!!./01")$!1"/!$'()*+,!/!0

!!-$2!,+$+#1+!/!.

!!!!!"#$!"#$%!/2!

!!!!!!$'()*+,!3/!4!!!!!!5,#)*6)7$'()*+,8

!!9

9

Actors



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03.&/)!-$*',:;

1"*!$'()*+,!/!



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1"*!7,$4!BC-$*',7::88

Create Actors

create actor with constructor arguments



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1"*!$'()*+,!/!


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1"*!$'()*+,!/!


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1"*!$'()*+,!/!


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!*"##%BC-$*',!$+)$,-#!-$*',!.

%%&1$//0-$%-$2!#)#*!/!.

!!!!:::!EE!$


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!*"##!A+$(,D#1+-$*',!$+)$,-#!-$*',!.

!!./01")$!1"/!$'()*+,!/!0

!!D+6>:#F!/!LD+,1#$+M,+$(,D#1+N

!!-$2!,+$+#1+!/!.

!!!!!"#$!"#$%!/2!

!!!!!!$'()*+,!3/!4

!!!!!!D+6>!O!"#$%!!9

9

the selfreference



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1"*%J',%+,!/!)8!/2!>)78

9

Actorsanonymous



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$'()*+,!O!"#$%!

Send: !

fire-forget



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1"*!,+D(6*!/!7


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1"*!,+D(6*=5*#')!/!


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EE!,+*(,)D!(*(,+

1"*!>(*(,+!/!


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!*"##!R'U+-$*',!$+)$,-#!-$*',!.

!!-$2!,+$+#1+!/!.

!!!!!"#$!ZD+,7):,+56C7L[#!N!3!)


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!*"##!R'U+-$*',!$+)$,-#!-$*',!.

!!-$2!,+$+#1+!/!.

!!!!!"#$!ZD+,7):D+)F+,!!9

9

Reply



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!*"##!R'U+-$*',!$+)$,-#!-$*',!.

!!-$2!,+$+#1+!/!.

!!!!!"#$!ZD+,7)


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EE!F+>#)+!*I+!$


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Akka Dispatchers



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&'($!)!\#D5


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1"*!F#D5


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MessageQueues

UnboundedLinkedBlockingQueue

BoundedLinkedBlockingQueueBounded ArrayBlockingQueueBounded SynchronousQueue

Plus different options per queue



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1"*!',+)8-$*',A+Q#D*,C:DI(*F'J)-66

ActorRegistry



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Let it crashfault-tolerance



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Stolen from

Erlang



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9ninesTuesday, July 20, 2010

O F O


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OneForOne

fault handling strategy


O F O


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OneForOne




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O F O


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OneForOne



O F O


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OneForOne



O F O


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OneForOne



O F O


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OneForOne




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AllF O


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AllForOne



AllF O


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AllForOne



AllF O


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AllForOne



S i hi hi


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Supervisor hierarchies


S i hi hi


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S i hi hi


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S i hi hi


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F l h dl


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-66V',=)+R*,


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6#)%7


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*,


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!*"##!R(5+,1#D',!$+)$,-#!-$*',!.

!!03.&/)!D+6>:;

!!*,


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!*"##!V


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Remote Actors


R t S


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EE!(D+!I'D*!i!5',*!#)!$')>#Q

A+U'*+_'F+:D*


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Client-initated and managedServer-initiated and managed

Two types of

remote actors


Cli t d


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EE!U+*I'FD!#)!-$*',!$6


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1"*!


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A+U'*+_'F+:,+Q#D*+,7

!!LD+,1#$+M#FNX!


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1"*!I


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STManother tool in the toolbox



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60

What isSTM?


STM: overview


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STM: overview See the memory (heap and stack) as atransactional dataset

Similar to a database

begin commit abort/rollback

Transactions are retried automaticallyupon collision

Rolls backthe memory on abort


Managed References


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Separates Identity fromValue

-Values are immutable

- Identity (Ref) holdsValues Change is a function

Compare-and-swap (CAS)

Abstraction of time Must be used within a transaction

Managed References


Managed References


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1"*!,+>!/!A+>7B:DJ


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1"*!(D+,D!/!",


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03.&/)!",!!9

9

STM:API



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Actors + STM =Transactors


Transactors


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!*"##!ZD+,A+Q#D*,C!$+)$,-#!",


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Transactors


Transactors


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TransactorsStart transaction


Transactors


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Send message


Transactors


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Send message


Transactors


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Send message

Update state

within transaction


Transactors


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Send message

Update state

within transaction


Transactors


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Send message

Update state

within transaction


Transactors


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Send message

Update state

within transaction


Transactors


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Send message

Update state

within transaction


Transactors


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Send message

Update state

within transaction


Transactors


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Send message

Update state

within transaction

Transaction

fails


Transactors


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Send message

Update state

within transaction

Transaction

fails


Transactors


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Transactors



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Transactors


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Transactors


Transactors


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Transactors



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Transactors


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Transactors


Transactors


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TransactorsTransaction

automatically

retried



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Agentsyet another tool in the toolbox


Agents


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1"*!()$*#')!


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(some of the)Modules



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Akka Spring


Spring integration


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lK+


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6


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Akka Camel


Camel: consumer


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!*"##!BC&')D(U+,!$+)$,-#!-$*',!40)5!&')D(U+,!.

!!-$2!+)F5'#)*Z,#!/!j>#6+MF


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!*"##!BC&')D(U+,!$+)$,-#!-$*',!40)5!&')D(U+,!.

!!-$2!+)F5'#)*Z,#!/!

!!!!jf+**CMI**5MEE0:0:0:0MccrrE$


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!*"##!&'U+*^,'F($+,!

!!$+)$,-#!-$*',!40)5!^,'F($+,!.

!!

!!-$2!+)F5'#)*Z,#!/!!!!!j$'U+*FMEE6'$


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1"*!5,'F($+,!/!


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Akka Persistence


Akka Persistence API


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EE!*,!/!B')Q'R*',

Turns the STM into ACID


Get data by id


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y

EE!*,!/!B')Q'R*',7((#F8


For Redis only (so far)


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For Redis only (so far)

1"*!s(+(+M!^+,D#D*+)*`(+(+?S6+U+)*"C5+@!/!!!

!!A+F#DR*',


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Akka Deployment


Deployment


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Deploy as dependency JAR inWEB-INF/lib etc.

Run as microkernelSoon OSGi-enabled, then drop

in any OSGi container (SpringDM server, Karaf etc.)

Deployment


and much more


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REST

Comet

Security

...and much more

Web

GuiceJTA

AMQP



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EOFTuesday, July 20, 2010


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Akka_ Simpler Scalability Tolerance, Con Currency _ Remoting Through Actors Presentation

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