[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
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I believe the docker subproject of hawkular metrics is obsolete and can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
3 weeks, 6 days
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
3 weeks, 6 days
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
3 weeks, 6 days
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.
3 weeks, 6 days
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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3 weeks, 6 days
[Metrics] How to react on low disk?
by Heiko W.Rupp
Hey,
<captain_obvious>
so for Hawkular-metrics (and Hawkular) we store the data in a Cassandra
database that puts files on a disk,
which can get full earlier than expected (and usually on week-ends). And
when the disk is full, Metrics does not like it.
</captain_obvious>
What can we do in this case?
I could imagine that on the C* nodes we run a script that uses df to
figure out the available space and tries
to run some compaction if space gets tight.
Of course that does not solve the issue per se, but should give some air
to breathe.
Right now I fear we are not able to reduce the ttl of a metric/tenant on
the fly and have metrics do the right thing - at least if I understood
yak correctly.
That script should possibly also send an email to an admin.
In case that we run Hawkular-full, we can determine the disk space and
feed that into Hawkular for Alerts to pick it up and then have the
machinery trigger the compaction and send the email.
8 years, 8 months
using hawkular wildfly agent as a custom java agent
by John Mazzitelli
This is for Matt, but figured post here for public consumption.
The question was asked yesterday, "Can we use the Hawkular WildFly Agent to monitor other things other than WildFly?"
I gave one answer, but forgot there is a second alternative.
====
The first answer that I gave is that you can use the Hawkular Wildfly Agent to collect JMX data via Jolokia interface. There is an integration in the agent that lets you define your resource and metric metadata and your JMX/Jolokia servers. As an example, see here: https://github.com/hawkular/hawkular-agent/blob/b52529823ca3c54d0b8b4aa56...
You define where your JMX servers are via the <remote-jmx> managed server like this:
<remote-jmx name="Remote JMX" enabled="false" resourceTypeSets="MainJMX,MemoryPoolJMX" url="http://localhost:8080/jolokia-war"/>
OK, that's the JMX integration. Maybe useful, maybe not. But I mention it just in case.
====
The second alternative I forgot to mention was the ability for any component running in WildFly to obtain a Hawkular Agent proxy via JNDI and use that proxy that store inventory and metrics into the Hawkular Server.
There is an example WAR module in the agent git repo that demonstrates how to obtain the proxy via JNDI and how to store inventory and metrics - see here: https://github.com/hawkular/hawkular-agent/tree/master/hawkular-wildfly-a...
This is just a simple WAR with a servlet. But it shows how a component can get the agent proxy via JNDI here:
https://github.com/hawkular/hawkular-agent/blob/master/hawkular-wildfly-a...
Here's code that shows the servlet doing things like sending metrics, avail, and creating resources:
https://github.com/hawkular/hawkular-agent/blob/master/hawkular-wildfly-a...
No one is using this yet. So there may be issues I am not aware of, but we have integration tests that show this working.
This was put together with the anticipation of someone asking for this capability - that is, "can the agent be used to collect metrics for other things other than WildFly". Essentially, this just gives you a skeleton Java agent that you can extend to collect your own metrics and inventory. So you can write a WAR or EAR, deploy it in any WildFly that has an agent subsystem, and your EAR/WAR can be used as an "agent" for your custom stuff.
Again, maybe useful, maybe not. But I mention it just in case.
8 years, 8 months
