Ramachandran Krishnan created RANGER-5655:
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Summary: Implement dynamic unified ingestor registry for
audit-ingestor: runtime Kafka partition routing and per-repo service allowlists
via compacted topic + REST, without ingestor restarts. Feature flag default off.
Key: RANGER-5655
URL: https://issues.apache.org/jira/browse/RANGER-5655
Project: Ranger
Issue Type: Task
Components: Ranger
Reporter: Ramachandran Krishnan
Assignee: Ramachandran Krishnan
Fix For: 3.0.0
Implement a *dynamic unified ingestor registry* for Ranger audit-ingestor so
operators can change Kafka partition routing and per-repo service allowlists at
runtime — without restarting ingestor pods.
The registry is stored in a Kafka compacted topic
({{{}ranger_audit_partition_plan{}}}) and managed via REST
({{{}/api/audit/partition-plan{}}}). All ingestor replicas converge on the same
versioned plan through a background watcher; {{AuditPartitioner}} routes audit
records on the hot path from in-memory state only.
Feature flag (default off):
{{ranger.audit.ingestor.kafka.partition.plan.dynamic.enabled=false}}
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h2. *Problem*
Today (static mode), audit-ingestor loads two kinds of configuration from XML
at startup only:
||Job||Question||Static behavior||
|Service allowlist|May this Kerberos principal POST audits for repo
{*}R{*}?|{{ranger.audit.ingestor.service.<repo>.allowed.users}} in site XML|
|Partition routing|After accept, which {{ranger_audits}}
partition?|{{kafka.configured.plugins}} + per-plugin overrides in site XML|
Changing either requires editing XML and {*}restarting every ingestor
replica{*}. Contiguous-range static allocation can also reshuffle later plugins
when an early plugin's partition count changes.
*Goals:*
* Onboard new plugins/repos and scale hot plugins without ingestor restart
* Append-only partition growth (no reshuffle of existing plugin assignments)
* One shared source of truth across all ingestor pods
* No new infra (no Postgres / ZooKeeper for the registry)
----
h2. Solution
Introduce a *unified partition plan document* (versioned JSON) in Kafka topic
{{ranger_audit_partition_plan}} (1 partition, compacted). One document holds:
* {{plugins}} — dedicated partition IDs per plugin id (Kafka record key /
agent id)
* {{buffer}} — partition pool for not-yet-promoted plugins (sticky hash)
* {{services}} — per-repo {{allowedUsers}} for {{POST /api/audit/access}}
* {{topicPartitionCount}} — must match live {{ranger_audits}} partition count
* {{version}} — optimistic locking for REST mutations
*Control plane:* REST + registry topic + {{PartitionPlanWatcher}}
*Data plane:* plugins POST {{/api/audit/access}} → allowlist check →
{{AuditPartitioner}} → {{ranger_audits}}
Solr/HDFS dispatchers are unchanged; they consume all partitions of
{{{}ranger_audits{}}}.
----
h2. Key deliverables
* *Kafka registry* — {{{}KafkaPartitionPlanRegistry{}}}, bootstrap from XML on
greenfield, brownfield pre-seed support
* *REST API* — {{{}GET/PATCH /partition-plan{}}}, {{{}POST
/partition-plan/plugins{}}}, {{{}POST /partition-plan/services{}}}, {{{}PATCH
/partition-plan/plugins/{pluginId{}}}} with {{expectedVersion}} (409 on stale)
* *Dynamic partitioner* — {{AuditPartitioner}} reads
{{{}PartitionPlanHolder{}}}; round-robin for promoted plugins; buffer sticky
hash for unknown plugins; post-scale routing uses {{max(cluster, plan)}} when
metadata lags
* *Unified allowlist* — {{services}} map in same registry; {{auth_to_local}}
rules recomposed from allowlists in dynamic mode
* *Topic grow* — grow {{ranger_audits}} before registry write when
promoting/scaling
* *E2E harness* — Docker Tier 3 scripts for partition-plan REST, plugin
onboard/routing, auth_to_local, full plugin→Solr pipelines (HDFS, Ozone, Hive,
etc.)
* *Documentation* — implementation guide, ops runbook, brownfield migration,
E2E test plan
----
h2. Configuration
{code:xml}
<property>
<name>ranger.audit.ingestor.kafka.partition.plan.dynamic.enabled</name>
<value>true</value>
</property>
<property>
<name>ranger.audit.ingestor.kafka.partition.plan.topic</name>
<value>ranger_audit_partition_plan</value>
</property>
{code}
When dynamic mode is on and registry is empty, the first ingestor pod
bootstraps an initial plan from existing XML properties
({{{}kafka.configured.plugins{}}}, buffer/per-plugin counts, service
allowlists).
----
h2. Example plan JSON
{code:json}
{
"topic": "ranger_audits",
"version": 12,
"topicPartitionCount": 48,
"plugins": {
"hdfs": { "partitions": [0, 1, 2, 3, 4, 5] },
"hiveServer2": { "partitions": [6, 7, 8, 9, 10, 11] }
},
"buffer": { "partitions": [12, 13, "..."] },
"services": {
"dev_hive": { "allowedUsers": ["hive"] },
"dev_ozone": { "allowedUsers": ["om", "ozone"] },
"dev_hdfs": { "allowedUsers": ["hdfs", "nn"] }
}
}
{code}
----
h2. Testing
*Unit tests:*
{code:bash}
mvn verify -pl audit-server/audit-common,audit-server/audit-ingestor
-Drat.skip=true
{code}
Key classes: {{{}AuditPartitionerDynamicTest{}}},
{{{}PartitionPlanAllocatorTest{}}}, {{{}PartitionPlanValidatorTest{}}},
{{{}PartitionPlanServiceMutationTest{}}}, {{PartitionPlanBootstrapTest}}
Validated scenarios include: static vs dynamic mode, greenfield bootstrap, REST
promote/scale (200/409/400), multi-pod convergence, brownfield pre-seed, plugin
onboard + Kafka partition routing, auth_to_local recomposition, HDFS/Ozone/Hive
full audit pipelines.
----
h2. Acceptance criteria
# With {{{}dynamic.enabled=false{}}}, behavior matches existing static XML
partitioning; {{GET /partition-plan}} returns 503
# With {{{}dynamic.enabled=true{}}}, registry topic created (1 partition,
compacted); bootstrap plan published on greenfield
# REST promote/scale updates plan version; stale {{expectedVersion}} returns
409
# All ingestor replicas converge to same plan within watcher refresh interval
# Audits for promoted plugin land only on assigned {{ranger_audits}} partitions
# {{POST /partition-plan/services}} updates allowlist; unauthorized principal
returns 403
# Post-scale routing works when Kafka metadata lags plan
({{{}AuditPartitioner{}}} bound logic)
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