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WordPress troubleshooting: Ansible Batch Writer Commits Partial Res

Fix Ansible batch processing playbooks that commit partial results to databases or APIs when validation fails, caused by missing transaction boundaries and early commits.

Published: Mar 7, 202611 min readBy FixWikiHub Editorial Team

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Introduction

In batch processing workflows with Ansible, a common pattern is to process records through multiple stages: read source data, transform records, validate results, and write to the destination. When validation fails at the final stage, the expectation is that no changes should persist. However, if each stage commits its work independently, partial results remain in the database, leaving the system in an inconsistent state.

This issue manifests when batch jobs fail validation but leave orphaned records, partial updates across related tables, or API calls that were executed but whose results were never acknowledged. The problem is particularly acute when processing financial transactions, inventory updates, or configuration changes where partial application causes data corruption.

Symptoms

The playbook processes a batch but fails at validation:

``` TASK [Process batch records] ************ ok: [localhost] => (item={'id': 1, 'amount': 100.00}) ok: [localhost] => (item={'id': 2, 'amount': 250.00}) ok: [localhost] => (item={'id': 3, 'amount': -50.00}) # Invalid negative amount ok: [localhost] => (item={'id': 4, 'amount': 175.00})

TASK [Validate all records] ************* fatal: [localhost]: FAILED! => {"msg": "Validation failed: Record 3 has invalid amount -50.00"} ```

But checking the database shows records 1, 2, and 4 were committed:

```sql SELECT * FROM transactions WHERE batch_id = 'batch-2026-04-12-001';

-- Record 3 is missing, but related records from 1, 2, 4 exist ```

Related tables show partial updates:

```sql SELECT * FROM transaction_audit WHERE batch_id = 'batch-2026-04-12-001';

id | transaction_id | action | created_at ----+---------------+-----------+-------------------- 1 | 1 | CREATED | 2026-04-12 08:25:01 2 | 2 | CREATED | 2026-04-12 08:25:02 3 | 4 | CREATED | 2026-04-12 08:25:04 ```

API calls were made but never marked complete:

bash

# API endpoint shows partial state
$ curl -s https://api.example.com/batches/batch-2026-04-12-001 | jq
{
  "id": "batch-2026-04-12-001",
  "status": "processing",
  "records": [
    {"id": 1, "status": "created"},
    {"id": 2, "status": "created"},
    {"id": 4, "status": "created"}
  ],
  "validation": "never_run"
}

Common Causes

1. Auto-Commit in Database Modules

Most Ansible database modules auto-commit each query, making multi-step operations non-atomic:

```yaml - name: Insert record postgresql_query: query: "INSERT INTO table VALUES (...)" # Commits immediately after this task

name: Insert related record
postgresql_query:
query: "INSERT INTO related_table VALUES (...)"
# If this fails, first insert is already committed
`

2. Validation After Write Operations

The playbook writes data before validation completes:

```yaml - name: Write all records postgresql_query: query: "INSERT INTO records VALUES (...)" loop: "{{ records }}"

name: Validate written records
postgresql_query:
query: "SELECT COUNT(*) FROM records WHERE valid = false"
# Too late - invalid records already written
`

3. API Calls Without Compensation

REST API calls execute immediately with no rollback mechanism:

yaml

- name: Create resources via API
  uri:
    url: "https://api.example.com/resources"
    method: POST
    body: "{{ item }}"
  loop: "{{ resources }}"
  # Each POST is immediately applied - no transaction

4. File-Based State Without Atomic Writes

Writing state files without atomic replace:

yaml

- name: Write partial results
  copy:
    content: "{{ partial_results }}"
    dest: /var/lib/batch/state.json
  # File written immediately, no rollback on failure

5. Missing Savepoint or Checkpoint Mechanism

Long-running batches have no checkpoints for partial rollback:

yaml

- name: Process 10000 records
  command: process-batch --input records.csv
  # No way to resume or rollback if fails at record 7500

Step-by-Step Fix

Step 1: Implement Transaction Boundaries

Wrap all write operations in explicit transactions:

```yaml - name: Process batch with transaction hosts: localhost vars: batch_id: "batch-{{ ansible_date_time.iso8601_basic_short }}"

tasks: - name: Begin transaction community.postgresql.postgresql_query: db: appdb query: "BEGIN" register: txn

name: Process records
block:
- name: Insert records
community.postgresql.postgresql_query:
db: appdb
query: >
INSERT INTO transactions (id, amount, batch_id, status)
VALUES (%s, %s, %s, 'pending')
positional_args:
- "{{ item.id }}"
- "{{ item.amount }}"
- "{{ batch_id }}"
loop: "{{ records }}"
register: insert_results

name: Validate all records
community.postgresql.postgresql_query:
db: appdb
query: >
SELECT id FROM transactions
WHERE batch_id = %s AND amount < 0
positional_args:
- "{{ batch_id }}"
register: invalid_records

name: Fail if validation errors
fail:
msg: "Validation failed: Found {{ invalid_records.query_result | length }} records with negative amounts"
when: invalid_records.query_result | length > 0

name: Commit transaction
community.postgresql.postgresql_query:
db: appdb
query: "COMMIT"

rescue: - name: Rollback transaction community.postgresql.postgresql_query: db: appdb query: "ROLLBACK"

name: Report failure
debug:
msg: "Batch {{ batch_id }} failed validation, all changes rolled back"
`

Step 2: Implement Two-Phase Commit Pattern

Separate preparation from commitment for better control:

```yaml - name: Two-phase batch processing hosts: localhost vars: batch_id: "{{ lookup('uuid') }}" staging_table: "transactions_staging"

tasks: - name: Phase 1 - Prepare all records in staging block: - name: Create staging table community.postgresql.postgresql_query: db: appdb query: > CREATE TEMP TABLE {{ staging_table }} AS SELECT * FROM transactions WITH NO DATA

name: Load records to staging
community.postgresql.postgresql_query:
db: appdb
query: >
INSERT INTO {{ staging_table }} (id, amount, batch_id)
VALUES (%s, %s, %s)
positional_args:
- "{{ item.id }}"
- "{{ item.amount }}"
- "{{ batch_id }}"
loop: "{{ records }}"

name: Validate staged records
community.postgresql.postgresql_query:
db: appdb
query: >
SELECT COUNT(*) as invalid_count
FROM {{ staging_table }}
WHERE amount < 0 OR amount > 1000000
register: validation

name: Check validation result
set_fact:
validation_passed: "{{ validation.query_result[0].invalid_count == 0 }}"

name: Phase 2 - Commit if validation passed
when: validation_passed
block:
- name: Move staged records to production
community.postgresql.postgresql_query:
db: appdb
query: >
INSERT INTO transactions (id, amount, batch_id, status)
SELECT id, amount, batch_id, 'committed'
FROM {{ staging_table }}

name: Record batch completion
community.postgresql.postgresql_query:
db: appdb
query: >
INSERT INTO batch_history (id, record_count, status, completed_at)
VALUES (%s, %s, 'success', NOW())
positional_args:
- "{{ batch_id }}"
- "{{ records | length }}"

name: Phase 2 - Abort if validation failed
when: not validation_passed
block:
- name: Record batch failure
community.postgresql.postgresql_query:
db: appdb
query: >
INSERT INTO batch_history (id, record_count, status, error_message, completed_at)
VALUES (%s, %s, 'failed', 'Validation failed', NOW())
positional_args:
- "{{ batch_id }}"
- "{{ records | length }}"

name: Fail the batch
fail:
msg: "Batch {{ batch_id }} failed validation - no records committed"
`

Step 3: Implement Compensating Transactions for APIs

For API-based operations, implement undo/compensation logic:

```yaml - name: API batch with compensation hosts: localhost vars: created_resources: []

tasks: - name: Create resources via API block: - name: Create each resource uri: url: "https://api.example.com/resources" method: POST body_format: json body: "{{ item }}" status_code: 201 loop: "{{ resources }}" register: create_results

name: Track created resource IDs
set_fact:
created_resources: "{{ create_results.results | map(attribute='json.id') | list }}"

name: Validate created resources
uri:
url: "https://api.example.com/batches/{{ batch_id }}/validate"
method: POST
status_code: 200
register: validation

name: Fail if validation error
fail:
msg: "Validation failed: {{ validation.json.errors }}"
when: validation.json.valid == false

rescue: - name: Compensating transaction - delete created resources uri: url: "https://api.example.com/resources/{{ item }}" method: DELETE status_code: 204 loop: "{{ created_resources }}" when: created_resources | length > 0

name: Log compensation
debug:
msg: "Rolled back {{ created_resources | length }} resources after validation failure"

name: Rethrow original error
fail:
msg: "{{ ansible_failed_result.msg }}"
`

Step 4: Use Atomic File Operations

Write files atomically using temporary files:

```yaml - name: Atomic file-based batch state hosts: localhost vars: state_dir: /var/lib/batch state_file: "{{ state_dir }}/current_state.json" temp_file: "{{ state_dir }}/.tmp_state.json"

tasks: - name: Ensure state directory exists file: path: "{{ state_dir }}" state: directory mode: '0755'

name: Process records and collect results
set_fact:
processed_results: "{{ processed_results | default([]) + [processed_item] }}"
vars:
processed_item:
id: "{{ item.id }}"
status: "processed"
timestamp: "{{ ansible_date_time.iso8601 }}"
loop: "{{ records }}"

name: Validate all results
fail:
msg: "Validation failed: Found invalid results"
when: processed_results | selectattr('status', 'equalto', 'error') | list | length > 0

name: Write to temporary file first
copy:
content: "{{ {'batch_id': batch_id, 'records': processed_results, 'updated': ansible_date_time.iso8601} | to_nice_json }}"
dest: "{{ temp_file }}"
mode: '0644'

name: Atomically replace state file
command: mv {{ temp_file }} {{ state_file }}
args:
creates: "{{ state_file }}"
changed_when: true
`

Step 5: Implement Batch Processing with Checkpoints

Add checkpoint-based processing for large batches:

```yaml - name: Checkpoint-based batch processing hosts: localhost vars: checkpoint_file: /var/lib/batch/checkpoint.json batch_size: 100

tasks: - name: Load checkpoint if exists slurp: src: "{{ checkpoint_file }}" register: checkpoint_data ignore_errors: yes

name: Set start position from checkpoint
set_fact:
start_position: "{{ (checkpoint_data.content | b64decode | from_json).position | default(0) }}"
batch_id: "{{ (checkpoint_data.content | b64decode | from_json).batch_id | default(lookup('uuid')) }}"
when: checkpoint_data is succeeded

name: Initialize checkpoint for new batch
set_fact:
start_position: 0
batch_id: "{{ lookup('uuid') }}"
when: checkpoint_data is failed

name: Process records from checkpoint
community.postgresql.postgresql_query:
db: appdb
query: >
BEGIN;
INSERT INTO transactions (id, amount, batch_id)
SELECT id, amount, %s
FROM source_records
WHERE id > %s
ORDER BY id
LIMIT %s;
SELECT MAX(id) as last_id FROM transactions WHERE batch_id = %s;
COMMIT;
positional_args:
- "{{ batch_id }}"
- "{{ start_position }}"
- "{{ batch_size }}"
- "{{ batch_id }}"
register: batch_result

name: Update checkpoint
copy:
content: "{{ {'batch_id': batch_id, 'position': batch_result.query_result[0].last_id, 'updated': ansible_date_time.iso8601} | to_nice_json }}"
dest: "{{ checkpoint_file }}"

name: Validate batch before final commit
community.postgresql.postgresql_query:
db: appdb
query: >
SELECT COUNT(*) as invalid_count
FROM transactions
WHERE batch_id = %s AND amount < 0
positional_args:
- "{{ batch_id }}"
register: validation

name: Rollback invalid batch
when: validation.query_result[0].invalid_count > 0
block:
- name: Delete invalid batch records
community.postgresql.postgresql_query:
db: appdb
query: "DELETE FROM transactions WHERE batch_id = %s"
positional_args:
- "{{ batch_id }}"

name: Clear checkpoint
file:
path: "{{ checkpoint_file }}"
state: absent

name: Fail the batch
fail:
msg: "Batch rolled back due to validation failure"

name: Clear checkpoint on success
file:
path: "{{ checkpoint_file }}"
state: absent
when: validation.query_result[0].invalid_count == 0
`

Verification

Test that partial results are properly rolled back:

```bash # Run batch with intentionally invalid data ansible-playbook batch_process.yml -e '{"records": [{"id": 1, "amount": 100}, {"id": 2, "amount": -50}]}'

# Verify no records were committed psql -d appdb -c "SELECT COUNT(*) FROM transactions WHERE batch_id = 'last_batch';" # Should return 0

# Check batch history shows failure psql -d appdb -c "SELECT * FROM batch_history ORDER BY created_at DESC LIMIT 1;" # Should show status = 'failed' ```

Test API compensation:

```bash # Run API batch that fails validation ansible-playbook api_batch.yml -e '{"resources": [{"name": "valid"}, {"name": "invalid"}]}'

# Verify no resources were left behind curl -s https://api.example.com/resources | jq 'length' # Should show no new resources ```

Test atomic file writes:

```bash # Simulate failure during file write ansible-playbook atomic_file_batch.yml

# Check that state file is either complete or absent test -f /var/lib/batch/current_state.json && echo "File exists and is valid" || echo "File does not exist (rolled back)" ```

[ansible-batch-importer-duplicates-rows-after-a-retry](/articles/ansible-batch-importer-duplicates-rows-after-a-retry) - Duplicate record issues
[ansible-lock-contention-grows-after-an-index-change](/articles/ansible-lock-contention-grows-after-an-index-change) - Transaction lock issues
[ansible-migration-holds-the-main-table-longer-than-the-deployment-window](/articles/ansible-migration-holds-the-main-table-longer-than-the-deployment-window) - Database migration issues

[WordPress troubleshooting: Ansible Artifact Download Uses an Old Mi](ansible-artifact-download-uses-an-old-mirror-after-proxy-change)
[WordPress troubleshooting: Ansible Audit Trail Misses Events Under ](ansible-audit-trail-misses-events-under-burst-load)
[WordPress troubleshooting: Ansible Background Worker Gets Stuck in ](ansible-background-worker-stuck-in-a-retry-loop)
[WordPress troubleshooting: Ansible Backup Completes but Restore Fai](ansible-backup-completes-but-restore-fails-checksum-validation)
[WordPress troubleshooting: Ansible Batch Importer Duplicates Rows A](ansible-batch-importer-duplicates-rows-after-a-retry)

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Last updated: Mar 7, 2026

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WordPress troubleshooting: Ansible Batch Writer Commits Partial Res

Introduction

Symptoms

Common Causes

Step-by-Step Fix

Step 1: Implement Transaction Boundaries

Step 2: Implement Two-Phase Commit Pattern

Step 3: Implement Compensating Transactions for APIs

Step 4: Use Atomic File Operations

Step 5: Implement Batch Processing with Checkpoints

Verification

People also search for

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Ansible Troubleshooting FAQs

FixWikiHub Editorial Team

Disclaimer & Safety Guidelines

Official Documentation & Further Reading

WordPress troubleshooting: Ansible Batch Writer Commits Partial Res

Introduction

Symptoms

Common Causes

Step-by-Step Fix

Step 1: Implement Transaction Boundaries

Step 2: Implement Two-Phase Commit Pattern

Step 3: Implement Compensating Transactions for APIs

Step 4: Use Atomic File Operations

Step 5: Implement Batch Processing with Checkpoints

Verification

Related Issues

Related Articles

People also search for

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FixWikiHub Editorial Team

Disclaimer & Safety Guidelines

Official Documentation & Further Reading