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[camel-website] 01/01: Blog - Whats new in Camel 3.9

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commit e8ebe791b9a7424607e15ac73afc576a0c860bb2
Author: Claus Ibsen <cl...@gmail.com>
AuthorDate: Fri Mar 26 11:27:30 2021 +0100

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+---
+title: "Apache Camel 3.9 What's New"
+date: 2021-03-29
+authors: [davsclaus]
+categories: ["Releases"]
+preview: Details of what we have done in the Camel 3.9 release.
+---
+
+Apache Camel 3.9 has just been released.
+
+This is a non-LTS release which means we will not provide patch releases.
+The next planned LTS release is 3.11 scheduled for June 2021.
+
+## So what's in this release
+
+This release introduces a set of new features and noticeable improvements that we will cover in this blog post.
+
+### Reduced object allocations
+
+We have optimized the core by dramatically reducing object allocations - in fact
+the routing engine will produce ZERO or little objects during routing.
+
+If you have seen Java monitoring tools then they will show memory usage charts
+that has _saw tooth's_ where objects are allocated and later reclaimed by the JVM garabage collector.
+
+The diagrams below illustrate the same example of using Camel 3.8 vs 3.9
+
+{{< image "memory-camel38.png" "Camel 3.8" >}}
+
+In Camel 3.8 597mb of objects is allocated by Camel in total (running 10 minute).
+
+{{< image "memory-camel39.png" "Camel 3.9" >}}
+
+And in Camel 3.9 that is **ZERO**
+
+For more details read [Claus blog post](http://www.davsclaus.com/2021/03/apache-camel-39-no-more-saw-tooth-jvm.html)
+which explains how this was done.
+
+### Optimized core
+
+We continue to optimize the Camel core. For this release we have continued
+to optimize the startup phase of Camel. Camel now prepare and wireup Camel routes
+at an earlier phase, which helps us in the near future, to be able to do build time
+optimizations (with GraalVM, Quarkus, etc.) of the Camel routes, which makes Camel
+startup even faster and quicker.
+
+We also began optimizing for loading classes earlier. We identified that when Camel routes
+is executing the first message, then the JVM classloader may load some Camel classes that
+are needed for routing. For this release we optimize some of the most common classes being loaded,
+but we want to implement a more automated solution for Camel 3.10, ensuring new classes are also eager loaded in the future.
+
+The Camel components that uses __header filtering__ has been optimized to
+filtering that are faster and much reduced object allocations.
+
+### Optimized HTTP component
+
+The `camel-http` component has been optimized to reduce object allocations, and be a little bit faster.
+We also introduce more options which can be used to turn off various functionality
+from the underlying HTTP client that are not needed (such as cookie management), which
+optimizes for better performance.
+
+### Multi language DSLs
+
+In Camel 3.8 we started porting over Camel K's support for DSLs in alternative languages.
+For this release we added support for:
+
+- JavaScript
+- Groovy
+- Kotlin
+
+This means you can implement Camel routes in different languages and run them together.
+
+This little [example](https://github.com/apache/camel-examples/tree/master/examples/camel-example-routeloader)
+shows using Java and XML routes together. But you can drop a .ktn file in the [myroutes](https://github.com/apache/camel-examples/tree/master/examples/routeloader/src/main/resources/myroutes)
+directory and Camel will during startup compile the Kotlin route and add its routes to the running Camel.
+
+Notice that this approach is based on the principe of runtime compiling small route DSL snippets.
+
+### Optional Property Placeholders
+
+Camel's elaborate property placeholder feature now supports optional placeholders,
+which is defined by a `?` (question mark) as prefix for the key name, eg
+
+    {{?myBufferSize}}
+
+And Camel understands when you use optional parameters when defining Camel endpoints, eg:
+
+    file:foo?bufferSize={{?myBufferSize}}
+
+Then the `bufferSize` option will only be configured if a placeholder exists.
+Otherwise the option will not be set on the endpoint, which allows to use any default value instead.
+
+
+### Kafka
+
+The `camel-kafka` component has been made more fault tolerant and is now better able to recover from various errors
+with connectivity to Kafka Brokers, or payload serialization errors, etc. You can for example configure what Camel should do
+based on the kind of caused `Exception`; whether to retry, or disconnect/reconnect, or something else.
+And for more control you can plugin your own custom strategy when the out of the box settings are not sufficient.
+
+The `camel-vertx-kafka` now has support for using manual offset commits.
+
+The `camel-kafka` has fixed some issues when using manual commit which would cause camel-kafka
+to automatic commit anyway (such as on shutdown).
+
+The components are upgraded to Kafka 2.7.
+
+### Spring Boot
+
+We have upgraded to latest Spring Boot 2.4.4 release.
+
+### New components
+
+This release has a number of new components, data formats and languages:
+
+- `camel-aws-secrets-manager` - Manage AWS Secrets Manager services
+- `camel-google-storage` - Store and retrieve objects from Google Cloud Storage Service
+- `camel-google-functions` - Manage and invoke Google Cloud Functions
+
+## Upgrading
+
+Make sure to read the [upgrade guide](/manual/latest/camel-3x-upgrade-guide-3_9.html) if you are upgrading from a previous Camel version.
+
+## Release Notes
+
+You can find more information about this release in the [release notes](/releases/release-3.9.0/), with a list of JIRA tickets resolved in the release.
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