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imsdu merged 1 commit into from
Oct 30, 2024
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Add passivation documentation #5208

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165 changes: 165 additions & 0 deletions docs/src/main/draw.io/delta/views/passivation.drawio
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8 changes: 8 additions & 0 deletions docs/src/main/paradox/docs/delta/api/graph-analytics-api.md
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Expand Up @@ -17,6 +17,14 @@ Please visit @ref:[Authentication & authorization](authentication.md) section to

@@@

@@@ note

Graph analytics indexing routines are also subject to passivation.

Please visit @ref:[Passivation](views/index.md#passivation) section to learn more about it.

@@@

@@@ note { .warning }

The described endpoints are experimental and the responses structure might change in the future.
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48 changes: 48 additions & 0 deletions docs/src/main/paradox/docs/delta/api/views/index.md
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Expand Up @@ -159,6 +159,54 @@ Request
Response
: @@snip [view-list.json](../assets/views/list.json)

## Passivation

@@@ note

This feature remains experimental and is not enabled by default.

Its configuration and implementation is subject to change.

@@@

Before this feature, when an indexing routine linked to a view consumed every resource to index, it was
waiting for a fixed delay before attempting to pull eventual changes which may have happened during this interval.

As it was repeated for every indexing routine when a Nexus deployment has a multitude of projects and views, this ended up
with a overhead on the database.

Passivation allows to reduce an overhead by centralizing those calls with a process dedicated to look for eventual
changes in projects.

With passivation when a view is considered active and has indexed all available data, that is to say a change on one of its resources has been pushed
on a given interval (by default in the last `10 minutes` and configurable), it keeps the same approach and looks for eventual data at a given interval.

When there is no change in the last `10 minutes`, the view is marked as inactive and gets passivated, that is to say
it stops looking for eventual changes and relies on the dedicated process looking for eventual changes to wake it up when this one
detects a change.

![Passivation](../assets/views/passivation.png)

The process detecting project changes is divided in 2 parts:

* A writing part which is computing incrementally the maximum offset and modified date for every project in Nexus and saves it in
the primary store.
This part relies on @ref:[the state log](../../architecture.md#anatomy) and the incremental approach allows it to be a lot faster than a sql query or a materialized view
which can take seconds (or more) to execute.
* A reading part which reads back those values in the database and computes for the different projects if those are active or not.
This part is called by the different indexing routines so that they know if they have to get out of their passivation state.

The default configuration is defined @link:[here](https://github.com/BlueBrain/nexus/blob/master/delta/app/src/main/resources/app.conf#L54)
in the `elem-query` and `project-last-update` configuration keys.

The values defined there are quite conservative and when passivation is enabled, the different delays and intervals can be
reduced according to your needs (they should not be lower than `200ms` though):

* A shorter interval/delay will improve indexing speed but will increase the pressure on the primary store
* A longer one will on the other hand reduce the pressure on the primary store but will also reduce indexing speed



## Indexing failures

### Listing indexing failures
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6 changes: 6 additions & 0 deletions docs/src/main/paradox/docs/releases/index.md
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@@ -1,6 +1,7 @@
@@@ index

- @ref:[v1.11 Release Notes](v1.11-release-notes.md)
- @ref:[v1.10 To v1.11 Migration](v1.10-to-v1.11-migration.md)
- @ref:[v1.10 Release Notes](v1.10-release-notes.md)
- @ref:[v1.9 To v1.10 Migration](v1.9-to-v1.10-migration.md)
- @ref:[v1.9 Release Notes](v1.9-release-notes.md)
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### New features/enhancements

- @ref:[Conditional requests](../delta/api/conditional-requests.md)
- @ref:[Passivation](../delta/api/views/index.md#passivation)

## 1.10.0

### Breaking changes
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