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OVERVIEW.md

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In src/main/java/org/opensearch/performanceanalyzer/:

  • PerformanceAnalyzerPlugin's constructor does the following:

    1. Creates a scheduledMetricCollectorsExecutor.
    2. scheduledMetricCollectorsExecutor.addScheduledMetricCollector(new XYZMetricsCollector()) is called for all collectors.
    3. scheduledMetricCollectorsExecutor.start() is called and then EventLogQueueProcessor.scheduleExecutor().

  • Methods in PerformanceAnalyzerPlugin interface with the OpenSearch plugin architecture

    • onIndexModule, onDiscovery, etc. are all called by OpenSearch when their corresponding events occur and the plugin can act on them.
    • For example:
      • getActionFilters provides OpenSearch with a list of classes that implement ActionFilter.
      • action/PerformanceAnalyzerActionFilter is the only class currently returned to OpenSearch as an ActionFilter.
      • when a BulkRequest or SearchRequest is recieved by OpenSearch, action/PerformanceAnalyzerActionFilter logs a start event and creates a listener (action/PerformanceAnalyzerActionListener) which waits to record the corresponding end event.
    • PerformanceAnalyzerPlugin.getRestHandlers returns all the classes that can handle REST requests to OpenSearch.

  • The classes in http_action/config define all the public API routes for Performance Analyzer.

    • http_action/config/RestConfig defines PA_BASE_URI = "/_plugins/_performanceanalyzer"
    • PerformanceAnalyzerResourceProvider defines the metrics, rca, batch and actions routes.
    • PerformanceAnalyzerResourceProvider.SUPPORTED_REDIRECTIONS = ("rca", "metrics", "batch", "actions")

  • listener/PerformanceAnalyzerSearchListener hooks into OpenSearch core to emit search operation related metrics.

  • writer/EventLogQueueProcessor:

    • contains purgeQueueAndPersist which drains PerformanceAnalyzerMetrics.metricQueue into a file that contains all events for a certain time bucket. It also removes old events. Uses event_process.EventLogFileHandler in Performance Analyzer Commons for file writing logic.
    • scheduleExecutor periodically runs purgeQueueAndPersist.

  • Classes in collectors extend PerformanceAnalyzerMetricsCollector and implement MetricsProcessor.

    • PerformanceAnalyzerMetricsCollector implements Runnable and contains common variables like value where a collector stores serialized metrics.
    • A collector is triggered through PerformanceAnalyzerMetricsCollector.collectMetrics.
      1. The collector will store serialized data in the value variable and then call MetricsProcessor.saveMetricValues.
      2. saveMetricValues calls PerformanceAnalyzerMetrics.emitMetric that creates an Event from the serialized data and adds it to a static queue (PerformanceAnalyzerMetrics.metricQueue) shared across all collectors.