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https://issues.apache.org/jira/browse/HDDS-1381?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Elek, Marton updated HDDS-1381:
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Description: See the original HDDS-829 issue for the description why is it
useful to (was: I tested Ozone on kubernetes cluster, because:
* It makes easy to do tests which are scaled up and down (for example test 500
nodes cluster)
* It makes very fast to deploy/undeploy newer versions
* It makes very easy to run the same cluster in multiple cloud environment.
* Long term it also could provide persistence store for any container/pod in
the k8s cluster
Kubernetes also very popular and could be useful to provide an official
guidance how ozone could be started and started on k8s.
As of now we use base image from the flokkr project (chats:
http://github.com/flokkr/charts, base image:
http://github.com/flokkr/docker-hadoop)
In this issue I would like to collect the required steps to provide a simple
way to start Ozone cluster on kubernetes.
What we need:
1. official apache/ozone:0.2.1, apache/ozone:0.3.0 docker images. (This is not
a big task as we have same for the apache/hadoop images. There is an existing
pattern which could be followed)
2. Create helm chart. (I have an example helm chart. It easier with the latest
scm/om initialization improvement, where the 'om --init' call could be executed
even if we have the files. We can make the chart be part of the official
helm/stable repository sooner or later)
3. The biggest difference between the flokkr and apache base images that flokkr
contains logic to instrument the java processes for prometheus.
This part downloads a jar file (based on https://github.com/elek/jmx_exporter)
and uses it as a java agent. This is a fork of the original jmx_exporter which
doesn't support dynamic jmx attachment.
I believe that we need a simple monitoring solution to show the key numbers of
a default install but this approach may be to complex to adopt in the apache
base image.
As prometheus use a very simple text format to publish the metrics I propose to
create a new simple servlet to publish all hadoop metrics. It should be similar
to this one:
https://github.com/prometheus/client_java/blob/master/simpleclient_common/src/main/java/io/prometheus/client/exporter/common/TextFormat.java
But based on Hadoop metrics.
Small independent change, could be done without any additional dependencies.
4. Other minor feature of the flokkr base image is the WAITFOR environment
variable which could be used to wait for a dependant service. (Could be used as
a workaround -- for example -- until HDDS-776 is implemented). Can be handled
with 8 lines of bash code
After 1-4.) we can add documentation how ozone could be started in any k8s
cluster.
)
> Support cloud native Ozone deployment (Phase II)
> ------------------------------------------------
>
> Key: HDDS-1381
> URL: https://issues.apache.org/jira/browse/HDDS-1381
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Reporter: Elek, Marton
> Assignee: Elek, Marton
> Priority: Major
>
> See the original HDDS-829 issue for the description why is it useful to
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