The producers and consumers compete for the memory assigned. This single memoryLimit setting specifies a maximum amount of memory on a given Pulsar client. In 2.8, we introduced a new API to set the memory limit. The same is true for topics that have many partitions. If an application has a large (or unknown) number of producers or consumers, it’s very difficult to select an appropriate value for queue sizes. However, there are few issues with this approach that make it complicated to select an overall configuration that controls the total usage of memory.įor example, the settings are based on the “number of messages”, so the expected message size must be adjusted per producer or consumer. These settings ultimately control the amount of memory the Pulsar client uses. Prior to 2.8, there are multiple settings in producers and consumers that allow controlling the sizes of the internal message queues. Read “ Package Management API” for more details.
#Pulsa 2 upgrade#
The newly introduced package management API provides an easier way to manage the packages for Functions and IO connectors and significantly simplifies the upgrade and rollback processes. Also, there is no version management in Pulsar for Functions and IO connectors. For example, today, if a function is deployed multiple times, the function package ends up being uploaded multiple times. While it offers many benefits, there are a number of ways to improve the user experience. Since its introduction in version 2.0, the Functions API has become hugely popular among Pulsar users. See “ PIP-68: Exclusive Producer” for more details. By leveraging the exclusive producer feature, Pulsar guarantees that the metadata topic contains different segments of updates, one per each successive leader, and there is no interleaving across different leaders. In order to write a single linear history of all the functions metadata updates, the metadata controller requires to elect one leader and that all the “decisions” made by this leader be written on the metadata topic. One use case for this feature is the metadata controller in Pulsar Functions. If the producer loses its exclusive access, no more messages from it can be published on the topic. It guarantees that there should be 1 single writer in any combination of errors. This new feature allows applications to require exclusive producer access in order to achieve a “single-writer” situation. However, there are several use cases that require exclusive access for a single writer, such as ensuring a linear non-interleaved history of messages or providing a mechanism for leader election. Simplified Client Memory Limit Settingsīy default, the Pulsar producer API provides a “multi-writer” semantic to append messages to a topic.The key features and updates in this release are: We spent more time on 2.8.0 in order to make the transaction API generally available to the Pulsar community. Note: The Pulsar community typically releases a major release every 3 months, but it has been 6 months since the release of 2.7.0. This blog provides a deep dive into the updates from the 2.8.0 release as well as a detailed look at the major Pulsar developments that have helped it evolve into the unified messaging and streaming platform it is today. We are very glad to see the Apache Pulsar community has successfully released the 2.8.0 version, which includes a number of exciting upgrades and enhancements.
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