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docs: add background info for session pool #2498

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merged 4 commits into from Jun 28, 2023
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docs: add background info for session pool #2498

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5a6e13d
docs: add background info for session pool
olavloite Jun 14, 2023
d4032d5
🦉 Updates from OwlBot post-processor
gcf-owl-bot[bot] Jun 14, 2023
15828d4
chore: add code formatting
olavloite Jun 14, 2023
d30cfab
Merge branch 'session-pool-background-info' of github.com:googleapis/…
olavloite Jun 14, 2023
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9 changes: 9 additions & 0 deletions .readme-partials.yaml
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Expand Up @@ -41,6 +41,15 @@ custom_content: |

In [DatabaseSelect.java](https://github.com/googleapis/google-cloud-java/tree/master/google-cloud-examples/src/main/java/com/google/cloud/examples/spanner/snippets/DatabaseSelect.java) we put together all the code shown above in a single program.

## Session Pool

The Cloud Spanner client maintains a session pool, as sessions are expensive to create and are
intended to be long-lived. The client automatically takes a session from the pool and uses this
executing queries and transactions.
See [Session Pool and Channel Pool Configuration](session-and-channel-pool-configuration.md)
for in-depth background information about sessions and gRPC channels and how these are handled in
the Cloud Spanner Java client.

## OpenCensus Metrics

Cloud Spanner client supports [Opencensus Metrics](https://opencensus.io/stats/),
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17 changes: 13 additions & 4 deletions README.md
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Expand Up @@ -50,20 +50,20 @@ If you are using Maven without the BOM, add this to your dependencies:
If you are using Gradle 5.x or later, add this to your dependencies:

```Groovy
implementation platform('com.google.cloud:libraries-bom:26.16.0')
implementation platform('com.google.cloud:libraries-bom:26.17.0')

implementation 'com.google.cloud:google-cloud-spanner'
```
If you are using Gradle without BOM, add this to your dependencies:

```Groovy
implementation 'com.google.cloud:google-cloud-spanner:6.42.3'
implementation 'com.google.cloud:google-cloud-spanner:6.43.0'
```

If you are using SBT, add this to your dependencies:

```Scala
libraryDependencies += "com.google.cloud" % "google-cloud-spanner" % "6.42.3"
libraryDependencies += "com.google.cloud" % "google-cloud-spanner" % "6.43.0"
```
<!-- {x-version-update-end} -->

Expand Down Expand Up @@ -147,6 +147,15 @@ try {

In [DatabaseSelect.java](https://github.com/googleapis/google-cloud-java/tree/master/google-cloud-examples/src/main/java/com/google/cloud/examples/spanner/snippets/DatabaseSelect.java) we put together all the code shown above in a single program.

## Session Pool

The Cloud Spanner client maintains a session pool, as sessions are expensive to create and are
intended to be long-lived. The client automatically takes a session from the pool and uses this
executing queries and transactions.
See [Session Pool and Channel Pool Configuration](session-and-channel-pool-configuration.md)
for in-depth background information about sessions and gRPC channels and how these are handled in
the Cloud Spanner Java client.

## OpenCensus Metrics

Cloud Spanner client supports [Opencensus Metrics](https://opencensus.io/stats/),
Expand Down Expand Up @@ -412,7 +421,7 @@ Java is a registered trademark of Oracle and/or its affiliates.
[kokoro-badge-link-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java11.html
[stability-image]: https://img.shields.io/badge/stability-stable-green
[maven-version-image]: https://img.shields.io/maven-central/v/com.google.cloud/google-cloud-spanner.svg
[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-spanner/6.42.3
[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-spanner/6.43.0
[authentication]: https://github.com/googleapis/google-cloud-java#authentication
[auth-scopes]: https://developers.google.com/identity/protocols/oauth2/scopes
[predefined-iam-roles]: https://cloud.google.com/iam/docs/understanding-roles#predefined_roles
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