[Hawkular-dev] Hawkular Metrics 0.3.4 - Release & Beyond

[Gary Brown]

Congratulations on the release.

Is the task queue mechanism going to be moved into Hawkular Commons repo, so it can be reused by other hawkular components?

Regards
Gary

----- Original Message -----
> Hello Everybody,
> 
> I am happy to announce release 0.3.4 of Hawkular Metrics. The release is
> anchored by stability improvements and Docker + Kubernetes work.
> 
> Here are the release highlights:
> 
> 1) InfluxDB Compatibility Layer
>  - pretty printing of query results with the 'pretty' query parameter
>  - absolute moment operands in queries (ex: select * from test where time >
>  1501560s and time < 4560546h)
>  - various fixes which allow to integrate nicely with Grafana (declaring
>  Hawkular Metrics as an InfluxDB 0.8 datasource)
> 
> 2) RxJavaMigration
>  - big refactoring to use RxJava instead of Guava's ListenableFuture
>  - RxJava provides a much richer API for building asynchronous programs
> 
> 3) Server Start-up
>  - the server no longer requires Cassandra to be started first
>  - any client requests will get back a 503 response code if the server has
>  not fully initialized due to Cassandra being down at start up time
> 
> 4) Docker and Kubernetes
>  - all project docker images are now available in Docker Hub! Get them here:
>     https://registry.hub.docker.com/u/hawkular/hawkular-metrics/
>     https://registry.hub.docker.com/u/hawkular/hawkular-cassandra/
>  - improved replication controller support now means that both the
>  Hawkular-Metrics and Cassandra images can be scaled up or down
>  - various other smaller improvements, including better support for when
>  containers startup
> 
> 5) REST API (IMPORTANT!)
>  - tenantId header was renamed to Hawkular-Tenant
>  - tenantId header fallback was removed
>  - GET {id}/tags only returns the tags, not the whole definition anymore
>  - GET {id} returns the metric definition (see HWKMETRICS-110 [1] for known
>  issue)
> 
> 6) UI Explorer
>  - was removed from the project
>  - discussions are underway to find a new home for the functionality and code
>  (probably hawkular-ui-components)
>  - npm is no longer required to compile the project
> 
> 7) Task Queue
>  - a generic task queue was designed and developed as part of this release
>  - provides functionality for scheduling and executing background tasks or
>  jobs
>  - task execution is
>     scalable - automatically distributed among Hawkular Metrics servers
>     durable - Tasks are persisted
>     fault tolerant - Tasks are rescheduled for future execution when there is
>     a failure
>  - it will serve as the foundation for
>     computing/storing aggregated metrics (i.e., rollups)
>     deleting metrics
>     changing data retention
>  - this functionality will be basis for any background task based design for
>  the project
> 
> 
> Github Release:
> https://github.com/hawkular/hawkular-metrics/releases/tag/0.3.4
> 
> JBoss Nexus Maven artifacts:
> http://origin-repository.jboss.org/nexus/content/repositories/public/org/hawkular/metrics/
> 
> Jira release tracker:
> https://issues.jboss.org/browse/HWKMETRICS/fixforversion/12327259/
> 
> 
> Hawkular Metrics 0.3.5 and Beyond
> 1) Gauge Aggregates - Long-term storage of numeric metrics at the expense of
> losing some fidelity. With task queue released in 0.3.4, the expectation is
> to start the actual implementation 0.3.5.
> 2) Update REST testing - while the current set of tests is a good gauge for
> regressions, the overall coverage is still low. The plan for 0.3.5 is to
> increase coverage.
> 3) Improved Docker and Kubernetes support - this is a long term goal for the
> project
> 4) RXJava - the initial transition from Guava was done in 0.3.4. Future
> releases will build upon this foundation.
>  
> 
> A big "Thank  you" goes to John Sanda, Thomas Segismont, Mike Thompson, Matt
> Wringe, Michael Burman, and Heiko Rupp for their project contributions.
> Special mentions go to Jeeva Kandasamy and Jirka  Kremser for their project
> help.
> 
> 
> [1] https://issues.jboss.org/browse/HWKMETRICS-110
> 
> Thank you,
> Stefan Negrea
> 
> Software Engineer
> 
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