[GSoC] Hawkular Android Client
by Artur Dryomov
Hi everyone,
This year I will be working on the Hawkular Android client application as
part of the Google Summer of Code 2015 program.
The application itself will use Hawkular API and AeroGear SDK. In coming
days I’ll research these areas, especially documentation, and will try to
create some sort of architecture and basic design.
Thank you all for this opportunity!
Artur.
2 weeks, 5 days
Hawkular Metrics Openshift Containers
by Matt Wringe
I have a new subproject in Hawkular Metrics which sets up creating
components for Openshift/Fabric8
(https://github.com/hawkular/hawkular-metrics/pull/200).
There are 3 main parts
Cassandra: creates a custom seed provider to support
ReplicationControllers in Kubernetes, creates a folder/zip archive which
can be used to generate a Docker image. It may make sense to move the
Cassandra parts out to a separate project.
Hawkular Metrics: creates a folder/zip archive which can be used to
generate a Docker image
Kubernetes: pulls everything together into a single kubernetes
application. Can be used to deploy an application zip into fabric8 (via
drag and drop in the web console or via the maven plugin) or deploy all
the components into Openshift via the kubernetes.json configuration file.
The docker images are not created and deployed to a docker registry as
part of the build, it will just create a folder where you can run the
docker build from. None of the maven docker plugins I looked at seemed
to really work properly, so its still a manual process to do the build
(and push to a registry). Its something which needs to be improved.
The Cassandra service currently only supports adding new nodes to a
cluster and not removing them via the ReplicationController. This is due
to the replication factor being set to be 1 by default (which means when
a node is removed, so is the data it contained).
I believe the docker subproject of hawkular metrics is obsolete and can
be removed
(https://github.com/hawkular/hawkular-metrics/tree/master/docker), but
someone please correct me if I am wrong. It's scripts are referring to
the console which no longer exists as part of the project.
- Matt
1 month
Maven swagger plugin
by Gary Brown
Hi
The current version of the maven-swagger-plugin used by hawkular doesn't include derived types in the generated docs.
I've tried updating to 2.3.4 and it still does not work. From some basic tests with 3.0.0, it seems to produce the correct content in the json schema - but has slightly different attributes to the plugin configuration, which when updated does not seem to run the template correctly.
The other issue is some API changes when updating the com.wordnik:swagger-* dependencies in line with this maven plugin, as there have been some GAV and API changes.
Its not an urgent issue, but it looks like we will be impacted by changes when we need to upgrade, so thought I would raise the issue.
Regards
Gary
1 month
Tenant Id - Not Part of URL
by Stefan Negrea
Hello Everybody,
I've been working on a PR for the upcoming Hawkular Metrics release that will remove the tenant id from the end-point URLs. The tenant id will be moved to either a header parameter or a query parameter. The query parameter is in place for cases (such as curl) where setting a header is not possible, difficult, or inconvenient.
Here is an example of the change:
Existing URL:
/{tenantId}/gauge/{metricId}/data
New URL:
/gauge/{metricId}/data
Tenant id set via:
1) header - tenantId
2) query parameter - tenantId
There are two exceptions to this rule, /tenants and /db/{tenantid}/series. The /tenants end-point will be changed into something different in the upcoming releases since it is mostly a management type API that does not belong in the same place with the regular metrics endpoint. And /db/{tenantid}/series end-point is needed in this exact format for compatibility with Influxdb compatible services.
Now, to the merits of this change. The tenant id is volatile, can change any time, and changes to it should be expected; but the rest of the URL is fixed. The second issue is that the tenant id is a security concern. So we were limited in design choices since a security concern was leaking as part of the URL.
So removing the tenant id from the URL will give us permanent & consistent addresses for resources (metrics and metric data points). And we will gain a lot of flexibility on the security side. In the future, users could authenticate with a user/pass combo and the backend would transform that into a tenant id to be used on the request. If the same user later decides to use a tenant id to pass along the request, the URL of the resources would not change. Another expectation is that tenant id is not sufficient, it is typically a combo of id + secret; so we would have resorted to a header or query param for the second piece of information (the secret).
This change will give us the flexibility to adjust the security model (the meaning of tenant ids and ways to validate them) without compromising the URL structure. This will help Hawkular Metrics as it gets integrated into more and more projects and products.
Here are the links to the JIRA and the PR for this change:
https://github.com/hawkular/hawkular-metrics/pull/202
https://issues.jboss.org/browse/HWKMETRICS-68
Thank you,
Stefan Negrea
Software Engineer
1 month
hawkular wildfly agent - feed ID
by John Mazzitelli
There was some concern that the feed ID autogenerated by the agent might not be what a person always wants (e.g. feed ID for WF10 agents will be the unique UUID of the wildfly server).
So, if you want to define your own feed ID, you can configure it now. In the agent's standalone.xml <storage-adapter> you can specify a feedId attribute if you want. By default, it isn't specified, so the agent will autogenerate a unique feed ID for itself (this should really be the normal mode of operation, but some people like to complain, so I made it easy to shut them up :-)
This is in master. Will be in the next release.
1 month
New and noteworthy in hawkular-parent 25
by Peter Palaga
Hi *,
hawkular-parent 25 brings the following:
* srcdeps-maven-plugin 0.0.5
* meets the promisses falsely done for 0.0.4:
* less console output
* built without tests
* wildfly-maven-plugin 1.1.0.Alpha4
I have sent PRs to all components repos.
Thanks,
Peter
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1 month
[Inventory] Performance of Tinkerpop3 backends
by Lukas Krejci
Hi all,
to move inventory forward, we need to port it to Tinkerpop3 - a new(ish) and
actively maintained version of the Tinkerpop graph API.
Apart from the huge improvement in the API expressiveness and capabilities,
the important thing is that it comes with a variety of backends, 2 of which
are of particular interest to us ATM. The Titan backend (with Titan in version
1.0) and SQL backend (using the sqlg library).
The SQL backend is a much improved (yet still unfinished in terms of
optimizations and some corner case features) version of the toy SQL backend
for Tinkerpop2.
Back in March I ran performance comparisons for SQL/postgres and Titan (0.5.4)
on Tinkerpop2 and concluded that Titan was the best choice then.
After completing a simplistic port of inventory to Tinkerpop3 (not taking
advantage of any new features or opportunities to simplify inventory
codebase), I've run the performance tests again for the 2 new backends - Titan
1.0 and Sqlg (on postgres).
This time the results are not so clear as the last time.
>From the charts [1] you can see that Postgres is actually quite a bit faster
on reads and can better handle concurrent read access while Titan shines in
writes (arguably thanks to Cassandra as its storage).
Of course, I can imagine that the read performance advantage of Postgres would
decrease with the growing amount of data stored (the tests ran with the
inventory size of ~10k entities) but I am quite positive we'd get competitive
read performance from both solutions up to the sizes of inventory we
anticipate (100k-1M entities).
Now the question is whether the insert performance is something we should be
worried about in Postgres too much. IMHO, there should be some room for
improvement in Sqlg and also our move to /sync for agent synchronization would
make this less of a problem (because there would be not that many initial
imports that would create vast amounts of entities).
Nevertheless I currently cannot say who is the "winner" here. Each backend has
its pros and cons:
Titan:
Pros:
- high write throughput
- backed by cassandra
Cons:
- slower reads
- project virtually dead
- complex codebase (self-made fixes unlikely)
Sqlg:
Pros:
- small codebase
- everybody knows SQL
- faster reads
- faster concurrent reads
Cons:
- slow writes
- another backend needed (Postgres)
Therefore my intention here is to go forward with a "proper" port to
Tinkerpop3 with Titan still enabled but focus primarily on Sqlg to see if we
can do anything with the write performance.
IMHO, any choice we make is "workable" as it is even today but we need to
weigh in the productization requirements. For those Sqlg with its small dep
footprint and postgres backend seems preferable to the huge dependency mess of
Titan.
[1] https://dashboards.ly/ua-TtqrpCXcQ3fnjezP5phKhc
--
Lukas Krejci
8 years, 3 months
