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add preStop hook for autoscaling down #142

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ba767e3
add preStop hook for autoscaling down
prabhatsharma Jul 20, 2025
b9b3eca
Update charts/openobserve/templates/ingester-statefulset.yaml
prabhatsharma Jul 20, 2025
db4ecfe
Update charts/openobserve/values.yaml
prabhatsharma Jul 20, 2025
da26c66
typo fix
prabhatsharma Jul 21, 2025
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4 changes: 2 additions & 2 deletions charts/openobserve/README.md
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
# OpenObserve helm chart
# OpenObserve Helm Chart

## Amazon EKS

Expand All @@ -11,7 +11,7 @@ You must set a minimum of 2 values:
1. IAM role for the serviceAccount to gain AWS IAM credentials to access s3
- serviceAccount.annotations."eks.amazonaws.com/role-arn"

## Install
## Installation

Install the Cloud Native PostgreSQL Operator. This is a prerequisite for openobserve helm chart. This helm chart sets up a postgres database cluster (1 primary + 1 replica) and uses it as metadata store of OpenObserve.
```shell
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40 changes: 40 additions & 0 deletions charts/openobserve/templates/ingester-statefulset.yaml
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Expand Up @@ -121,6 +121,46 @@ spec:
successThreshold: {{ .Values.probes.ingester.config.readinessProbe.successThreshold | default 1 }}
failureThreshold: {{ .Values.probes.ingester.config.readinessProbe.failureThreshold | default 3 }}
{{- end }}
{{- if .Values.autoscaling.ingester.enabled }}
lifecycle:
preStop:
exec:
command:
- /bin/sh
- -c
- |
# Get credentials from environment variables
USER_EMAIL="$ZO_ROOT_USER_EMAIL"
USER_PASSWORD="$ZO_ROOT_USER_PASSWORD"

# Create base64 encoded credentials for Authorization header
AUTH_HEADER=$(echo -n "${USER_EMAIL}:${USER_PASSWORD}" | base64)

# Disable the node first
echo "Disabling ingester node..."
curl -X PUT "http://localhost:{{ .Values.config.ZO_HTTP_PORT }}/node/enable?value=false" \
-H "Authorization: Basic ${AUTH_HEADER}"

# returns 200 if successful and "true" if the node is disabled

# Flush all data from memory to WAL. This does not flush data from ingester to s3.
echo "Flushing data from ingester..."
curl -X PUT "http://localhost:{{ .Values.config.ZO_HTTP_PORT }}/node/flush" \
-H "Authorization: Basic ${AUTH_HEADER}"

# returns 200 if successful and "true" if the node is flushed
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Copilot AI Jul 20, 2025

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The curl commands lack error handling. If the API calls fail, the script continues without knowing if the operations succeeded, which could lead to data loss.

Suggested change
curl -X PUT "http://localhost:{{ .Values.config.ZO_HTTP_PORT }}/node/enable?value=false" \
-H "Authorization: Basic ${AUTH_HEADER}"
# returns 200 if successful and "true" if the node is disabled
# Flush all data from memory to WAL. This does not flush data from ingester to s3.
echo "Flushing data from ingester..."
curl -X PUT "http://localhost:{{ .Values.config.ZO_HTTP_PORT }}/node/flush" \
-H "Authorization: Basic ${AUTH_HEADER}"
# returns 200 if successful and "true" if the node is flushed
RESPONSE=$(curl -s -o /dev/null -w "%{http_code}" -X PUT "http://localhost:{{ .Values.config.ZO_HTTP_PORT }}/node/enable?value=false" \
-H "Authorization: Basic ${AUTH_HEADER}")
if [ "$RESPONSE" -ne 200 ]; then
echo "Error: Failed to disable ingester node. HTTP response code: $RESPONSE"
exit 1
fi
# Flush all data from memory to WAL. This does not flush data from ingester to s3.
echo "Flushing data from ingester..."
RESPONSE=$(curl -s -o /dev/null -w "%{http_code}" -X PUT "http://localhost:{{ .Values.config.ZO_HTTP_PORT }}/node/flush" \
-H "Authorization: Basic ${AUTH_HEADER}")
if [ "$RESPONSE" -ne 200 ]; then
echo "Error: Failed to flush data from ingester. HTTP response code: $RESPONSE"
exit 1
fi

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# We need another API to check if all the data has been moved to s3 or /flush should become async and move files to s3 as well
# e.g /node/wal_status
# Need to build this API. Until then, we will wait for 900 seconds.

# Wait for 900 seconds after flush to ensure data is moved to s3
# 15 minutes for now, since file movement to s3 may take up to 10 minutes
echo "Waiting 900 seconds to flush data..."
sleep 900
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Copilot AI Jul 20, 2025

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The sleep duration of 900 seconds is a magic number that should be made configurable through values.yaml to allow for environment-specific tuning.

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echo "Pre-stop hook completed"
{{- end }}
resources:
{{- toYaml .Values.resources.ingester | nindent 12 }}
envFrom:
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4 changes: 2 additions & 2 deletions charts/openobserve/values.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -1015,14 +1015,14 @@ probes:
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 3
terminationGracePeriodSeconds: 30
terminationGracePeriodSeconds: 1200 # 20 minutes for now, since we are using pre-stop hook to flush data andit takes up to 10 minutes to flush data to s3
livenessProbe:
initialDelaySeconds: 10
periodSeconds: 10
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 3
terminationGracePeriodSeconds: 30
terminationGracePeriodSeconds: 1200 # 20 minutes for now, since we are using pre-stop hook to flush data andit takes up to 10 minutes to flush data to s3
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Copilot AI Jul 20, 2025

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There is a spelling error in the comment: 'andit' should be 'and it'.

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querier:
enabled: false
config:
Expand Down