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KETTLE -- Kubernetes Extract Tests/Transform/Load Engine

This collects test results scattered across a variety of GCS buckets, stores them in a local SQLite database, and outputs newline-delimited JSON files for import into BigQuery.

Results are stored in the k8s-gubernator:build BigQuery dataset, which is publicly accessible.

Deploying

Kettle runs as a pod in the k8s-gubernator/g8r cluster. To drop into it's context, run <root>$ make -C kettle get-cluster-credentials

If you change:

  • buckets.yaml: do nothing, it's automatically fetched from GitHub
  • deployment.yaml: deploy with make push deploy
  • any code: Run from root deploy with make -C kettle push update, revert with make -C kettle rollback if it fails
    • push builds the continer image and pushes it to the image registry
    • update sets the image of the existing kettle Pod which triggers a restart cycle
    • this will build the image to Pantheon Container Registry
    • See Makefile for details

Note:

  • If you make local changes in the branch prior to make push/update the image will be uploaded with -dirty in the tag. Keep this in mind when seeting the image. If you see a Pod in a ImagePullBackOff loop, there is likely an issue when kubectl image set was run, where the image does not exist in the specified location.

Restarting

Find out when the build started failing

eg: by looking at the logs

make get-cluster-credentials
kubectl logs -l app=kettle

# ...

==== 2018-07-06 08:19:05 PDT ========================================
PULLED 174
ACK irrelevant 172
EXTEND-ACK  2
gs://kubernetes-jenkins/pr-logs/pull/kubeflow_kubeflow/1136/kubeflow-presubmit/2385 True True 2018-07-06 07:51:49 PDT FAILED
gs://kubernetes-jenkins/logs/ci-cri-containerd-e2e-ubuntu-gce/5742 True True 2018-07-06 07:44:17 PDT FAILURE
ACK "finished.json" 2
Downloading JUnit artifacts.

Alternatively, navigate to Gubernator BigQuery page (click on “all” on the left and “Details”) and you can see a table showing last date/time the metrics were collected.

Replace pods

kubectl delete pod -l app=kettle
kubectl rollout status deployment/kettle # monitor pod restart status
kubectl get pod -l app=kettle # should show a new pod name

Verify functionality

You can watch the pod startup and collect data from various GCS buckets by looking at its logs

kubectl logs -f $(kubectl get pod -l app=kettle -oname)

It might take a couple of hours to be fully functional and start updating BigQuery. You can always go back to the Gubernator BigQuery page and check to see if data collection has resumed. Backfill should happen automatically.

Adding Fields

To add fields to the BQ table, Visit the k8s-gubernator:build BigQuery dataset and Select the table (Ex. Build > All). Schema -> Edit Schema -> Add field. As well as update schema.json

Adding Buckets

To add a new GCS bucket to Kettle, simply update buckets.yaml in master, it will be auto pulled by Kettle on the next cycle.

gs://<bucket path>: #bucket url
  contact: "username" #Git Hub Username
  prefix: "abc:" #the identifier prefixed to jobs from this bucket (ends in :).
  sequential: (bool) #an optional boolean that indicates whether test runs in this
  #                  bucket are numbered sequentially
  exclude_jobs: # list of jobs to explicitly exclude from kettle data collection
    - job_name1
    - job_name2

CI

A postsubmit job runs that pushes Kettle on changes.

Known Issues

  • Occasionally data from Kettle stops updating, we suspect this is due to a transient hang when contacting GCS (#8800). If this happens, restart kettle