Class: Karafka::Web::Pro::Ui::Controllers::Topics::ReplicationsController

Inherits:
BaseController
  • Object
show all
Defined in:
lib/karafka/web/pro/ui/controllers/topics/replications_controller.rb

Overview

Controller responsible for viewing and managing topics replication details

Instance Method Summary collapse

Instance Method Details

#show(topic_name) ⇒ Object

Displays requested topic replication details

Parameters:

  • topic_name (String) —

    topic we're interested in



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# File 'lib/karafka/web/pro/ui/controllers/topics/replications_controller.rb', line 49

def show(topic_name)
  @topic = Models::Topic.find(topic_name)

  @partitions = refine(@topic[:partitions])

  # Extract replication factor from the first partition (same for all partitions)
  # The partitions data is an array of hashes with :replica_count key
  first_partition = @topic[:partitions]&.first
  @replication_factor = first_partition&.fetch(:replica_count, 0) || 0

  # Fetch min.insync.replicas from topic config
  min_isr_config = @topic.configs.find { |c| c.name == "min.insync.replicas" }
  @min_isr = min_isr_config&.value&.to_i || 1

  # Determine resilience issues (checked in priority order):
  # 1. No redundancy: RF = 1 (single point of failure, most severe)
  # 2. Zero write fault tolerance: RF > 1 but RF <= minISR (can't lose any broker)
  # 3. Low durability: RF > 1 and minISR = 1 (data loss risk if leader fails)
  @has_no_redundancy = @replication_factor == 1
  @has_zero_fault_tolerance = @replication_factor > 1 &&
    @replication_factor <= @min_isr
  @has_low_durability = @replication_factor > 1 && @min_isr == 1

  @has_resilience_issue = @has_zero_fault_tolerance ||
    @has_low_durability ||
    @has_no_redundancy

  render
end