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+---
+title: Replicação e Tolerância a Faltas
+description: >
+  Tipos de registos.
+
+  Memória partilhada.
+
+  Espaço de tuplos.
+path: /sd/replicacao-e-tolerancia-a-faltas
+type: content
+---
+
+# Replicação e Tolerância a Faltas
+
+```toc
+
+```
+
+## Introdução a sistemas replicados
+
+A replicação consiste no processo de **manter cópias de dados e software** de um
+serviço em **várias máquinas**.
+
+![Diagrama de uma replicação](./assets/0005-replication-example.svg#dark=3)
+
+### Benefícios de replicar um sistema
+
+- melhor **disponibilidade**: mesmo que alguns nós falhem ou fiquem indisponíveis
+  devido a falhas na rede, o sistema continua disponível
+- melhor **desempenho e escalabilidade**:
+  - Podem existir cópias mais próximas do cliente
+  - Algumas operações não precisam de ser executadas sobre todo o sistema, podendo
+    ser executadas apenas sobre algumas cópias (distribuindo assim a carga e
+    aumentando a escalabilidade)
+
+### Linearizabilidade
+
+Uma das garantias essenciais que um sistema replicado tem que assegurar é a
+**coerência**.
+O ideal seria um cliente ler a **versão mais recente** do recurso
+sempre que lê de uma réplica (mesmo que essa versão tenha sido escrita noutra réplica).
+Um critério de coerência que podemos utilizar é a **linearizabilidade**.
+Antes de definirmos o que é, é necessário ter em conta o seguinte quanto à ordenação
+de operações:
+
+- As operações realizadas sobre um sistema replicado **não são instantâneas**:
+  - A operação é invocada por um cliente, executada durante algum tempo e o cliente
+    só recebe a resposta mais tarde.
+- Se uma operação X começa depois de outra operação Y acabar, então X ocorre depois de Y
+- Se uma operação X começa antes de outra operação Y acabar, então X é concorrente com Y
+
+:::details[Exemplo]
+
+![Exemplo de ordenação de operações](./assets/0005-operation-sorting-example.svg#dark=3)
+
+- A concorrente com B
+- A anterior a C
+- B anterior a C
+- C concorrente com D
+- C anterior a E
+- D concorrente com E
+
+:::
+
+:::info[Definição]
+
+Um sistema replicado diz-se **linearizável** se e só se:
+
+1. Existe uma **serialização virtual** que respeita o **tempo real** em que as
+   operações foram invocadas, isto é:
+
+   - Se $op_1$ ocorre antes de $op_2$ (em tempo real), então $op_1$ tem de aparecer
+     antes de $op_2$ na serialização virtual. (se $op_1$ e $op_2$ forem concorrentes,
+     a serialização pode ordená-las de forma arbitrária)
+
+2. A execução observada por cada cliente é coerente com essa serialização (para
+   todos os clientes), ou seja:
+   - Os valores retornados pelas leituras feitas por cada cliente refletem as
+     operações anteriores na serialização
+
+:::
+
+:::details[Exercício]
+
+> Considere os seguintes exemplos em que um cliente escreve sobre um inteiro replicado.
+> Quais das execuções são serializáveis?
+>
+> Exemplo 1:
+> ![Exemplo 1 de serialização](./assets/0005-serialization-example-1.svg#dark=3)
+>
+> Exemplo 2:
+> ![Exemplo 2 de serialização](./assets/0005-serialization-example-2.svg#dark=3)
+>
+> Exemplo 3:
+> ![Exemplo 3 de serialização](./assets/0005-serialization-example-3.svg#dark=3)
+
+**R**: Apenas o 1º exemplo:
+
+![Solução exemplo 1](./assets/0005-serialization-example-1-sol.svg#dark=3)
+
+:::
+
+## Registos partilhados e replicados
+
+Um registo suporta duas operações:
+
+- Escrita:
+  - uma escrita substitui o valor da anterior
+  - apenas um cliente pode escrever no registo num dado instante, ou seja, as
+    escritas são ordenadas
+- Leitura:
+  - múltiplos clientes podem ler do registo ao mesmo tempo
+
+### Tipos de registos
+
+Lamport definiu três modelos de coerência para registos:
+
+- **Safe**:
+
+  - Se uma leitura não for concorrente com uma escrita, lê o último valor escrito
+  - Se for, pode retornar um valor arbitrário
+
+- **Regular**:
+
+  - Se uma leitura não for concorrente com uma escrita, lê o último valor escrito
+  - Se for, ou retorna o valor anterior ou o valor que está a ser escrito
+  - **NOTA**: este tipo de registo não é linearizável, já que enquanto decorre uma
+    escrita, é possível que leituras seguidas leiam sequências incoerentes de
+    valores (primeiro o novo valor e depois o antigo)
+
+- **Atomic**:
+  - Equivalente a linearizabilidade quando aplicada a registos
+  - O resultado da execução é equivalente ao resultado de uma execução em que todas
+    as escritas e leituras ocorrem instantaneamente num ponto entre o início e o
+    fim da operação
+
+:::details[Exemplos]
+
+- registo "Unsafe":
+
+![Exemplo de registo unsafe](./assets/0005-serialization-example-2.svg#dark=3)
+
+- registo "Safe":
+
+![Exemplo de registo safe](./assets/0005-safe-register-example.svg#dark=3)
+
+- registo "Regular":
+
+![Exemplo de registo regular](./assets/0005-serialization-example-3.svg#dark=3)
+
+- registo "Atomic":
+
+![Exemplo de registo atomic](./assets/0005-serialization-example-1-sol.svg#dark=3)
+
+:::
+
+:::tip[De onde surgiu a ideia de um registo "safe"?]
+
+Considere um registo com o valor $0$ (em binário: $0000~0000$) e que se quer
+escrever o valor $3$ (em binário: $0000~0011$). Se não existir um mecânismo de
+sincronização que impeça o leitor de ler o registo durante a escrita, a leitura
+pode retornar um dos seguintes valores:
+
+- $0000~0000$ = $0$
+- $0000~0001$ = $1$
+- $0000~0010$ = $2$
+- $0000~0011$ = $3$
+
+(já que os bits são alterados individualmente em instantes diferentes)
+
+:::
+
+### Registos distribuídos
+
+Uma forma de implementar registos distribuídos é a seguinte:
+
+- Cada processo mantém uma cópia do registo
+- Cada registo guarda um tuplo `<valor, versão>`
+- Para executar uma operação (leitura ou escrita), os processos trocam mensagens
+  entre si
+
+É possível implementar este funcionamento de forma a que seja tolerante a faltas
+e não bloqueante!
+
+#### Algoritmo ABD
+
+Registo regular (com um só escritor):
+
+- Escrita:
+
+  - O escritor incrementa o número de versão e envia o tuplo `<valor, versão>`
+    para todos os processos.
+  - Quando os outros processos recebem esta mensagem, atualizam a sua cópia do
+    registo (caso seja uma versão mais recente que a local) e enviam uma confirmação
+    ao escritor.
+  - A operação termina quando o escritor receber resposta de uma maioria.
+
+- Leitura:
+  - O leitor envia uma mensagem a todos os processos solicitando o tuplo mais recente
+  - Cada processo envia o seu tuplo `<valor, versão>`
+  - Após receber resposta de uma maioria, retorna o valor mais recente e atualiza
+    o valor local (caso necessário)
+
+![Intuição do algoritmo](./assets/0005-ABD-algorithm-intuiton.svg#dark=3)
+
+:::details[Exemplo]
+
+![Exemplo de execução do algoritmo](./assets/0005-ABD-algorithm-example.svg#dark=3)
+
+:::
+
+:::warning[O algoritmo não é atómico]
+
+![Diagrama que demonstra que o algoritmo não é atómico
+](./assets/0005-ABD-algorithm-not-atomic-example.svg#dark=3)
+
+Tal como ilustrado no diagrama, é possível obter leituras diferentes consoante
+as réplicas que contactamos (lendo $v_1$, depois $v_0$ e $v_1$ novamente), violando o
+princípio da [linearizabilidade](./#linearizabilidade).
+
+:::
+
+Registo atómico (com um só escritor):
+
+- Escrita:
+
+  - Idêntico ao anterior.
+
+- Leitura:
+  - Executa o algoritmo de leitura anterior **mas não retorna o valor**
+  - Executa o algoritmo de escrita, **usando o valor lido**
+  - **Retorna** o valor lido apenas **após a escrita ter terminado**
+
+### Espaço de Tuplos
+
+#### Espaço de Tuplos "Linda"
+
+Consiste num espaço partilhado que contêm um conjunto de tuplos (ex: `<"A">`,
+`<"A", 1>`, `<"A", "B">`) e que suporta 3 operações:
+
+- `Put`: adiciona um tuplo (sem afetar os tuplos existentes) no espaço
+- `Read`: retorna o valor de um tuplo (sem afetar o conteúdo do espaço)
+- `Take`: também retorna um tuplo mas remove-o do espaço
+- Tanto `Read` como `Take` são bloqueantes caso o tuplo não exista
+- Tanto `Read` como `Take` aceitam _wildcards_: `Read(<"A", *>)` pode retornar
+  `<"A", 1>` ou `<"A", "B">`
+
+Como o `Take` é bloqueante, pode ser usado para sincronizar processos:
+
+- Elege-se um tuplo especial, por ex. `<lock>`.
+- Cada processo remove o tuplo do espaço antes de aceder à região crítica e volta
+  a colocá-lo no fim, garantindo assim exclusão mútua
+- Conseguimos assim através de uma única interface partilhar memória e sincronizar
+  processos
+
+Enquanto que nos registos uma escrita fazia _override_ do valor antigo, aqui o
+processo equivalente é realizar um `Take` seguido de um `Put` (os tuplos são
+imutáveis). O `Take` permite fazer operações que em memória partilhada requerem
+uma instrução do tipo
+[_**compare-and-swap**_](/so/implementation/#solu%C3%A7%C3%B5es-com-suporte-do-hardware).
+
+:::tip[Nota]
+
+Note que as operações `Put`, `Read` e `Take` são conhecidas como `out`, `rd` e
+`in` no modelo Linda, usamos estes nomes mais descritivos como simplificação.
+
+:::
+
+#### _Xu-Liskov_
+
+Muitas das implementações de espaços de tuplos adotam uma solução centralizada.
+Isto tem vantagens em termos de simplicidade, mas tais soluções não são
+tolerantes a falhas nem escaláveis.
+
+_Xu-Liskov_ é uma implementação **distribuída e tolerante a faltas** do "Linda".
+
+:::warning[Algumas observações prévias]
+
+- A tolerância de faltas pressupõe um serviço de filiação que gere o grupo de
+  réplicas:
+
+  - **Quando uma réplica falha, a filiação do grupo é alterada**
+
+- Sendo assim, quando o algoritmo **espera por "todas"** as respostas ou pela maioria
+  delas, **refere-se à filiação do grupo** num dado instante.
+
+- Esta alteração dinâmica da filiação é um problema bastante complexo por si só
+  e portanto não vai ser abordado
+
+- Os autores optam por usar [_**UDP**_](/rc/transporte/#udp---user-datagram-protocol)
+  (portanto pode haver perda de mensagens), sendo o próprio algoritmo responsável
+  por retransmitir mensagens.
+  - Solução modular: usar [_**TCP**_](/rc/transporte/#tcp---transmission-control-protocol)
+
+:::
+
+O objetivo dos autores com este _design_ era obter a solução mais eficiente e com
+o menor tempo de resposta possível, mas assegurando
+[linearizabilidade](./#linearizabilidade).
+
+:::info[Funcionamento do algoritmo]
+
+`Put`:
+
+1. The requesting site multicasts the `put` request to all members of the view;
+2. On receiving this request, members insert the tuple into their replica and
+   acknowledge this action;
+3. Step 1 is repeated until all acknowledgements are received.
+   For the correct operation of the protocol, replicas must detect and acknowledge
+   duplicate requests, but not carry out the associated put operations.
+
+`Read`:
+
+1. The requesting site multicasts the `read` request to all members of the view;
+2. On receiving this request, a member returns a matching tuple to the requestor,
+3. The requestor returns the first matching tuple received as the result of the
+   operation (ignoring others);
+4. Step 1 is repeated until at least one response is received.
+
+`Take`:
+
+**Phase 1**: Selecting the tuple to be removed
+
+1. The requesting site multicasts the `take` request to all members of the view;
+2. On receiving this request, each replica acquires a lock on the associated tuple
+   set and, if the lock cannot be acquired, the `take` request is rejected;
+3. All accepting members reply with the set of all matching tuples;
+4. Step 1 is repeated until all sites have accepted the request and responded with
+   their set of tuples and the intersection is non-null;
+5. A particular tuple is selected as the result of the operation (selected
+   randomly from the intersection of all the replies);
+6. If only a minority accept the request, this minority are asked to release their
+   locks and phase 1 repeats.
+
+**Phase 2**: Removing the selected tuple
+
+1. The requesting site multicasts a remove request to all members of the view
+   citing the tuple to be removed;
+2. On receiving this request, members remove the tuple from their replica, send
+   an acknowledgement and release the lock;
+3. Step 1 is repeated until all acknowledgements are received.
+
+:::
+
+Visto que este algoritmo foi projetado para minimizar o _delay_ :
+
+- Operações `read` apenas bloqueiam até que a primeira réplica responda ao pedido
+- Operações `take` bloqueiam até o final da fase 1, quando o tuplo a ser excluído foi acordado
+- Operações `put` podem retornar imediatamente
+
+No entanto, isto introduz níveis inaceitáveis de concorrência. Por exemplo, uma
+operação `read` pode aceder a um tuplo que deveria ter sido excluído na segunda
+fase de uma operação `take`. Assim, são necessárias as seguintes restrições adicionais:
+
+- As operações de cada _worker_ devem ser executadas em cada réplica na mesma ordem
+  em que foram emitidas pelo _worker_
+- Uma operação `put` não deve ser executada em nenhuma réplica até que todas as
+  operações `take` anteriores, emitidas pelo mesmo _worker_, tenham sido concluídas
+  em todas as réplicas (na visão do mesmo)
+
+:::tip[Nota]
+
+> Operações `take` bloqueiam até o final da fase 1, quando o tuplo a ser excluído foi acordado
+
+Note que isto é uma otimização para minimizar a latência, no algoritmo original
+o _worker_ fica bloqueado até o final da fase 2. Esta otimização não faz parte
+do projeto.
+
+:::
+
+:::details[Exemplos]
+
+`Read`:
+
+![Exemplo de operação "Read"](./assets/0005-xu-liskov-read-example.svg#dark=3)
+
+`Put`:
+
+![Exemplo de operação "Put"](./assets/0005-xu-liskov-put-example.svg#dark=3)
+
+`Take`:
+
+![Exemplo de operação "Take"](./assets/0005-xu-liskov-take-example.png#dark=3)
+
+:::
+
+Imaginemos que o `Read` não era bloqueante, ou seja, ou retornava o tuplo
+ou "_null_". O sistema continuaria a ser linearizável? **Não**, pois seria possível:
+
+- Um cliente executa `Put` de um tuplo $t$
+- Um cliente executa `Read(t)` várias vezes, concorrentemente com o `Put`
+- Se o leitor recebe respostas de réplicas diferentes em cada `Read`, pode ler $t$
+  e de seguida "_null_"
+
+Quanto ao `Take`, é possível que dois processos tentem fazer `Take` do mesmo tuplo
+concorrentemente e nenhum consiga a maioria (_deadlock_). Para resolver este problema
+introduz-se um fator de aleatoriedade: cada processo repete o seu pedido um tempo
+aleatório depois (solução não determinista).
+
+## Referências
+
+- Coulouris et al - Distributed Systems: Concepts and Design (5th Edition)
+  - Secção 6.5
+- Departamento de Engenharia Informática - Slides de Sistemas Distribuídos (2023/2024)
+  - SlidesTagus-Aula05
+  - SlidesAlameda-Aula05
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42.5 -169.9 M42.5 -169.9 C42.5 -169.9, 42.5 -169.9, 42.5 -169.9 M42.5 -169.9 C42.5 -169.9, 42.5 -169.9, 42.5 -169.9" stroke="#1971c2" stroke-width="2" fill="none"></path></g></g><mask></mask><g transform="translate(10 352.3439954329192) rotate(0 115.38832636327425 32.60549975485151)"><text x="115.38832636327415" y="0" font-family="Cascadia, Segoe UI Emoji" font-size="13.585624897854759px" fill="#e03131" text-anchor="middle" style="white-space: pre;" direction="ltr" dominant-baseline="text-before-edge">* Mensagem pode demorar muito</text><text x="115.38832636327415" y="16.30274987742571" font-family="Cascadia, Segoe UI Emoji" font-size="13.585624897854759px" fill="#e03131" text-anchor="middle" style="white-space: pre;" direction="ltr" dominant-baseline="text-before-edge">ou o cliente pode falhar e</text><text x="115.38832636327415" y="32.60549975485142" font-family="Cascadia, Segoe UI Emoji" font-size="13.585624897854759px" fill="#e03131" text-anchor="middle" style="white-space: pre;" direction="ltr" dominant-baseline="text-before-edge">nunca ser recebida por R3 -</text><text x="115.38832636327415" y="48.90824963227713" font-family="Cascadia, Segoe UI Emoji" font-size="13.585624897854759px" fill="#e03131" text-anchor="middle" style="white-space: pre;" direction="ltr" dominant-baseline="text-before-edge">escrita incompleta</text></g><g stroke-linecap="round"><g transform="translate(352.1717761476948 316.8511122060668) rotate(0 29.304587577128586 -110.88337087806826)"><path d="M-0.62 0.46 C9.11 -36.79, 47.75 -185.78, 57.6 -222.81 M1.26 -0.34 C11.42 -37.54, 50.39 -185.14, 59.78 -221.82" stroke="#1971c2" stroke-width="2" fill="none"></path></g><g transform="translate(352.1717761476948 316.8511122060668) rotate(0 29.304587577128586 -110.88337087806826)"><path d="M60.68 -220.43 L63.4 -205.54 L50.85 -208.39 L59.3 -220.16" stroke="none" stroke-width="0" fill="#1971c2" fill-rule="evenodd"></path><path d="M59.78 -221.82 C61.08 -219.62, 59.83 -215.1, 62.48 -207.06 M59.78 -221.82 C61.3 -218.05, 62.04 -212.41, 62.48 -207.06 M62.48 -207.06 C58.29 -208.85, 55.83 -209.81, 50.21 -210.26 M62.48 -207.06 C58.88 -207.56, 55.74 -209.2, 50.21 -210.26 M50.21 -210.26 C51.93 -212.36, 54.6 -218.38, 59.78 -221.82 M50.21 -210.26 C53.76 -214.63, 57.98 -218.65, 59.78 -221.82 M59.78 -221.82 C59.78 -221.82, 59.78 -221.82, 59.78 -221.82 M59.78 -221.82 C59.78 -221.82, 59.78 -221.82, 59.78 -221.82" stroke="#1971c2" stroke-width="2" fill="none"></path></g></g><mask></mask><g transform="translate(265.4755222079134 331.3342367578698) rotate(0 70.3125 19.200000000000045)"><text x="70.3125" y="0" font-family="Cascadia, Segoe UI Emoji" font-size="16px" fill="#1971c2" text-anchor="middle" style="white-space: pre;" direction="ltr" dominant-baseline="text-before-edge">Fase de leitura</text><text x="70.3125" y="19.2" font-family="Cascadia, Segoe UI Emoji" font-size="16px" fill="#1971c2" text-anchor="middle" style="white-space: pre;" direction="ltr" dominant-baseline="text-before-edge">Lê &lt;v0, t0&gt;</text></g><g transform="translate(338.0498174298946 10) rotate(0 93.75 19.200000000000045)"><text x="93.75" y="0" font-family="Cascadia, Segoe UI Emoji" font-size="16px" fill="#1971c2" text-anchor="middle" style="white-space: pre;" direction="ltr" dominant-baseline="text-before-edge">Cliente calcula</text><text x="93.75" y="19.2" font-family="Cascadia, Segoe UI Emoji" font-size="16px" fill="#1971c2" text-anchor="middle" style="white-space: pre;" direction="ltr" dominant-baseline="text-before-edge">t1 = &lt;seq0 + 1, cid&gt;</text></g><g stroke-linecap="round"><g transform="translate(429.796162426368 57.085892582882025) rotate(0 0 18.28335190718235)"><path d="M-0.5 0.24 C-0.57 6.31, -0.23 30, -0.12 36.08 M0.25 -0.12 C0.06 6.03, -0.55 30.27, -0.61 36.52" stroke="#1971c2" stroke-width="2" fill="none"></path></g><g transform="translate(429.796162426368 57.085892582882025) rotate(0 0 18.28335190718235)"><path d="M-6.54 19.23 C-4.05 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5.859375 12)"><text x="0" y="0" font-family="Cascadia, Segoe UI Emoji" font-size="20px" fill="#e03131" text-anchor="start" style="white-space: pre;" direction="ltr" dominant-baseline="text-before-edge">X</text></g><g stroke-linecap="round"><g transform="translate(460.0231906347544 94.71077113806587) rotate(0 122.41814210889652 83.96439729003009)"><path d="M1.19 0.72 C42.18 28.87, 204.7 140.02, 245.44 167.8 M0.35 0.06 C41.29 28.49, 203.99 141.21, 244.8 169.27" stroke="#2f9e44" stroke-width="2" fill="none"></path></g><g transform="translate(460.0231906347544 94.71077113806587) rotate(0 122.41814210889652 83.96439729003009)"><path d="M244.12 168.42 L230.83 167.63 L236.09 155.49 L244.24 170.35" stroke="none" stroke-width="0" fill="#2f9e44" fill-rule="evenodd"></path><path d="M244.8 169.27 C241.97 169.53, 237.14 169.1, 230.01 166.76 M244.8 169.27 C240.67 169.04, 237.95 167.74, 230.01 166.76 M230.01 166.76 C231.46 164.9, 234.19 160.62, 237.22 156.33 M230.01 166.76 C231.5 163.66, 234.31 160.71, 237.22 156.33 M237.22 156.33 C239.64 160.44, 244.29 166.03, 244.8 169.27 M237.22 156.33 C239.74 160.67, 242.49 164.72, 244.8 169.27 M244.8 169.27 C244.8 169.27, 244.8 169.27, 244.8 169.27 M244.8 169.27 C244.8 169.27, 244.8 169.27, 244.8 169.27" stroke="#2f9e44" stroke-width="2" fill="none"></path></g></g><mask></mask><g stroke-linecap="round"><g transform="translate(722.956045468045 262.0029760570542) rotate(0 17.479419599143057 -82.45046309840404)"><path d="M1.09 0.5 C6.75 -27.12, 28.69 -137.86, 34.15 -165.57 M0.2 -0.28 C6.23 -27.77, 30.44 -136.95, 36.44 -164.38" stroke="#2f9e44" stroke-width="2" fill="none"></path></g><g transform="translate(722.956045468045 262.0029760570542) rotate(0 17.479419599143057 -82.45046309840404)"><path d="M38.07 -165.17 L38.16 -149.04 L27.07 -153.51 L36.08 -166.31" stroke="none" stroke-width="0" fill="#2f9e44" fill-rule="evenodd"></path><path d="M36.44 -164.38 C38.12 -160.79, 37.69 -156.53, 39.7 -149.74 M36.44 -164.38 C36.72 -160.69, 38.36 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diff --git a/content/sd/assets/0005-operation-sorting-example.svg b/content/sd/assets/0005-operation-sorting-example.svg
new file mode 100755
index 00000000..f9d8ffcf
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diff --git a/content/sd/assets/0005-safe-register-example.svg b/content/sd/assets/0005-safe-register-example.svg
new file mode 100755
index 00000000..664d459b
--- /dev/null
+++ b/content/sd/assets/0005-safe-register-example.svg
@@ -0,0 +1,21 @@
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new file mode 100755
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diff --git a/content/sd/assets/0005-serialization-example-1.svg b/content/sd/assets/0005-serialization-example-1.svg
new file mode 100755
index 00000000..adc1b38b
--- /dev/null
+++ b/content/sd/assets/0005-serialization-example-1.svg
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+        src: url("https://excalidraw.com/Cascadia.woff2");
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diff --git a/content/sd/assets/0005-serialization-example-2.svg b/content/sd/assets/0005-serialization-example-2.svg
new file mode 100755
index 00000000..4d93cc0c
--- /dev/null
+++ b/content/sd/assets/0005-serialization-example-2.svg
@@ -0,0 +1,21 @@
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+  <!-- svg-source:excalidraw -->
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+        font-family: "Virgil";
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+        font-family: "Cascadia";
+        src: url("https://excalidraw.com/Cascadia.woff2");
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diff --git a/content/sd/assets/0005-serialization-example-3.svg b/content/sd/assets/0005-serialization-example-3.svg
new file mode 100755
index 00000000..1a3b781b
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diff --git a/content/sd/assets/0005-xu-liskov-put-example.svg b/content/sd/assets/0005-xu-liskov-put-example.svg
new file mode 100755
index 00000000..ca6ab32c
--- /dev/null
+++ b/content/sd/assets/0005-xu-liskov-put-example.svg
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new file mode 100755
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