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Table of Contents

Status

Current state: "Under Discussion"

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JIRA:

Jira
serverASF JIRA
columnIdsissuekey,summary,issuetype,created,updated,duedate,assignee,reporter,customfield_12311032,customfield_12311037,customfield_12311022,customfield_12311027,priority,status,resolution
columnskey,summary,type,created,updated,due,assignee,reporter,Priority,Priority,Priority,Priority,priority,status,resolution
serverId5aa69414-a9e9-3523-82ec-879b028fb15b
keyKAFKA-17876
Jira
serverASF JIRA
columnIdsissuekey,summary,issuetype,created,updated,duedate,assignee,reporter,customfield_12311032,customfield_12311037,customfield_12311022,customfield_12311027,priority,status,resolution
columnskey,summary,type,created,updated,due,assignee,reporter,Priority,Priority,Priority,Priority,priority,status,resolution
serverId5aa69414-a9e9-3523-82ec-879b028fb15b
keyKAFKA-19150

Motivation

Kafka metrics have traditionally followed a consistent naming convention using the kafka.<COMPONENT> format. However, some inconsistencies were unintentionally introduced during recent refactorings:

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This change will align these metrics with the broader Kafka metrics ecosystem and avoid confusion for users and tooling that rely on consistent naming.

Public Interface

  • org.apache.kafka.storage.internals.log.RemoteStorageThreadPool 
  • org.apache.kafka.server.log.remote.storage.RemoteStorageMetrics 
  • org.apache.kafka.server.AssignmentsManager

Proposed Changes

Introduce new metrics, consistent with other Kafka metrics.

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This change will impact external monitoring systems that rely on the old metric name; corresponding updates will be required.

Compatibility, Deprecation, and Migration Plan

  1. We will add a deprecated annotation on following constant
    1. `RemoteStorageMetrics#REMOTE_LOG_READER_TASK_QUEUE_SIZE_METRIC`
    2. `RemoteStorageMetrics#REMOTE_LOG_READER_AVG_IDLE_PERCENT_METRIC`
    3. `AssignmentsManager#QUEUED_REPLICA_TO_DIR_ASSIGNMENTS_METRIC`
  2. Update the Kafka documentation to note MBean will be replaced
    1. `org.apache.kafka.storage.internals.log:type=RemoteStorageThreadPool.RemoteLogReaderTaskQueueSize`
    2. `org.apache.kafka.storage.internals.log:type=RemoteStorageThreadPool.RemoteLogReaderAvgIdlePercent`
    3. `org.apache.kafka.server:type=AssignmentsManager.QueuedReplicaToDirAssignments`
  3. Register folowing new metrics
    1. `kafka.log.remote:type=RemoteStorageThreadPool.RemoteLogReaderTaskQueueSize`
    2. `kafka.log.remote:type=RemoteStorageThreadPool.RemoteLogReaderAvgIdlePercent`
    3. `kafka.server:type=AssignmentsManager.QueuedReplicaToDirAssignments`
  4. Delete following all usage in code base at the Kafka 5.0
    1. `RemoteStorageMetrics#REMOTE_LOG_READER_TASK_QUEUE_SIZE_METRIC`
    2. `RemoteStorageMetrics#REMOTE_LOG_READER_AVG_IDLE_PERCENT_METRIC`
    3. `AssignmentsManager#QUEUED_REPLICA_TO_DIR_ASSIGNMENTS_METRIC`

Test Plan

  • Add new tests to verify the new metric is correctly registered and behaves as expected.
  • Ensure backward compatibility by verifying deprecated metric behavior until removal.

Rejected Alternatives

n/a