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DOCSP-9967 correct causal consistency scenario 1 text vs image #4076

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Apr 22, 2020
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DOCSP-9967 correct causal consistency scenario 1 text vs image #4076

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32 changes: 22 additions & 10 deletions source/core/causal-consistency-read-write-concerns.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -155,11 +155,13 @@ the following causal consistency guarantees:
* - | 1. Write\ :sub:`1` with write concern :writeconcern:`"majority"` to ``P``\ :sub:`new`
| 2. Read\ :sub:`1` with read concern :readconcern:`"majority"` to ``S``\ :sub:`2`
| 3. Write\ :sub:`2` with write concern :writeconcern:`"majority"` to ``P``\ :sub:`new`
|
| 4. Read\ :sub:`2` with read concern :readconcern:`"majority"` to ``S``\ :sub:`3`

- | For item ``A``, update ``qty`` to ``50``.
| Read item ``A``.
| For items with ``qty`` less than ``50``, update ``reorder`` to ``true``.
| For items with ``qty`` less than or equal to ``50``,
| update ``restock`` to ``true``.
| Read item ``A``.

.. figure:: /images/causal-rc-majority-wc-majority.svg
Expand Down Expand Up @@ -210,11 +212,13 @@ the following causal consistency guarantees:
* - | 1. Write\ :sub:`1` with write concern :writeconcern:`"majority"` to ``P``\ :sub:`new`
| 2. Read\ :sub:`1` with read concern :readconcern:`"majority"` to ``S``\ :sub:`1`
| 3. Write\ :sub:`2` with write concern :writeconcern:`"majority"` to ``P``\ :sub:`new`
|
| 4. Read\ :sub:`2` with with read concern :readconcern:`"majority"` to ``S``\ :sub:`3`

- | For item ``A``, update ``qty`` to ``50``.
| Read item ``A``.
| For items with ``qty`` less than ``50``, update ``reorder`` to ``true``.
| For items with ``qty`` less than or equal to ``50``,
| update ``restock`` to ``true``.
| Read item ``A``.

In this sequence, Read\ :sub:`1` cannot return until the
Expand Down Expand Up @@ -292,11 +296,13 @@ provides the following causal consistency guarantees *if causal consistency impl
* - | 1. Write\ :sub:`1` with write concern :writeconcern:`{ w: 1 } <\<number\>>` to ``P``\ :sub:`old`
| 2. Read\ :sub:`1` with read concern :readconcern:`"majority"` to ``S``\ :sub:`2`
| 3. Write\ :sub:`2` with write concern :writeconcern:`{ w: 1 } <\<number\>>` to ``P``\ :sub:`new`
|
| 4. Read\ :sub:`2` with with read concern :readconcern:`"majority"` to ``S``\ :sub:`3`

- | For item ``A``, update ``qty`` to ``50``.
| Read item ``A``.
| For items with ``qty`` less than ``50``, update ``reorder`` to ``true``.
| For items with ``qty`` less than or equal to ``50``,
| update ``restock`` to ``true``.
| Read item ``A``.

.. figure:: /images/causal-rc-majority-wc-1.svg
Expand Down Expand Up @@ -385,14 +391,16 @@ provides the following causal consistency guarantees *if causal consistency impl

- Example

* - | Write\ :sub:`1` with write concern :writeconcern:`{ w: 1 } <\<number\>>` to ``P``\ :sub:`old`
| Read\ :sub:`1` with read concern :readconcern:`"majority"` to ``S``\ :sub:`1`
| Write\ :sub:`2` with write concern :writeconcern:`{ w: 1 } <\<number\>>` to ``P``\ :sub:`new`
| Read\ :sub:`2` with with read concern :readconcern:`"majority"` to ``S``\ :sub:`3`
* - | 1. Write\ :sub:`1` with write concern :writeconcern:`{ w: 1 } <\<number\>>` to ``P``\ :sub:`old`
| 2. Read\ :sub:`1` with read concern :readconcern:`"majority"` to ``S``\ :sub:`1`
| 3. Write\ :sub:`2` with write concern :writeconcern:`{ w: 1 } <\<number\>>` to ``P``\ :sub:`new`
|
| 4. Read\ :sub:`2` with with read concern :readconcern:`"majority"` to ``S``\ :sub:`3`

- | For item ``A``, update ``qty`` to ``50``.
| Read item ``A``.
| For items with ``qty`` less than ``50``, update ``reorder`` to ``true``.
| For items with ``qty`` less than or equal to ``50``,
| update ``restock`` to ``true``.
| Read item ``A``.

In this sequence:
Expand Down Expand Up @@ -495,11 +503,13 @@ some situations, but not necessarily in all situations.
* - | 1. Write\ :sub:`1` with write concern :writeconcern:`{ w: 1 } <\<number\>>` to ``P``\ :sub:`old`
| 2. Read\ :sub:`1` with read concern :readconcern:`"local"` to ``S``\ :sub:`1`
| 3. Write\ :sub:`2` with write concern :writeconcern:`{ w: 1 } <\<number\>>` to ``P``\ :sub:`new`
|
| 4. Read\ :sub:`2` with read concern :readconcern:`"local"` to ``S``\ :sub:`3`

- | For item ``A``, update ``qty`` to ``50``.
| Read item ``A``.
| For items with ``qty`` less than ``50``, update ``reorder`` to ``true``.
| For items with ``qty`` less than or equal to ``50``,
| update ``restock`` to ``true``.
| Read item ``A``.

.. figure:: /images/causal-rc-local-wc-1.svg
Expand Down Expand Up @@ -564,11 +574,13 @@ some situations, but not necessarily in all situations.
* - | 1. Write\ :sub:`1` with write concern :writeconcern:`"majority"` to ``P``\ :sub:`new`
| 2. Read\ :sub:`1` with read concern :readconcern:`"local"` to ``S``\ :sub:`1`
| 3. Write\ :sub:`2` with write concern :writeconcern:`"majority"` to ``P``\ :sub:`new`
|
| 4. Read\ :sub:`2` with read concern :readconcern:`"local"` to ``S``\ :sub:`3`

- | For item ``A``, update ``qty`` to ``50``.
| Read item ``A``.
| For items with ``qty`` less than ``50``, update ``reorder`` to ``true``.
| For items with ``qty`` less than or equal to ``50``,
| update ``restock`` to ``true``.
| Read item ``A``.

.. figure:: /images/causal-rc-local-wc-majority.svg
Expand Down