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Greptile Overview

Greptile Summary

Fixes cache inconsistency issue when queries with different histogram intervals run against the same streaming aggregation. The PR changes the cache refresh strategy from "delete-then-write" to "overwrite-then-cleanup-mismatched", ensuring cache files with the target interval are preserved while removing incompatible intervals.

Key changes:

• Adds RBAC control requiring stream edit (PUT) permission for cache refresh operations
• Disables cache discovery when overwrite_cache=true to force fresh computation
• Deletes mismatched-interval cache files post-execution rather than pre-execution
• Propagates overwrite_cache/clear_cache flags through the distributed execution pipeline
• Deprecates the old clear_streaming_agg_cache function

Note: The implementation includes a documented race condition where concurrent queries with different intervals during cache refresh may see partial results. This is an accepted trade-off for simplicity.

Confidence Score: 4/5

• Safe to merge with minor style improvements possible
• The core logic correctly addresses the cache inconsistency problem by overwriting then cleaning up mismatched intervals. RBAC implementation properly restricts cache refresh to authorized users. The documented race condition is acknowledged and appears acceptable for this use case. Minor inefficiency with duplicate function call can be optimized.
• Pay attention to src/service/search/streaming/execution.rs for the cache cleanup logic and race condition behavior in production

Important Files Changed

File Analysis

Sequence Diagram

sequenceDiagram
    participant User
    participant HTTP Handler
    participant RBAC
    participant Search Service
    participant Streaming Exec
    participant Cache System
    participant GLOBAL_CACHE

    User->>HTTP Handler: POST /search?clear_cache=true
    HTTP Handler->>RBAC: check_resource_permissions(PUT)
    alt No edit permission
        RBAC-->>User: 403 Unauthorized
    end
    RBAC-->>HTTP Handler: Permission granted
    HTTP Handler->>HTTP Handler: Set req.clear_cache=true, req.use_cache=false
    HTTP Handler->>Search Service: search(req)
    Search Service->>Search Service: Create Request with overwrite_cache=true
    Search Service->>Search Service: search_partition(use_aggs_cache=false)
    Note over Search Service: Skip cache discovery since<br/>use_aggs_cache=false
    Search Service->>Streaming Exec: do_partitioned_search(clear_cache=true)
    Streaming Exec->>Streaming Exec: Execute query WITHOUT using cache
    Streaming Exec->>Cache System: Write new cache files (60min interval)
    Note over Streaming Exec,GLOBAL_CACHE: After query completes
    Streaming Exec->>GLOBAL_CACHE: Get cache_file_path & target_interval
    Streaming Exec->>Cache System: delete_mismatched_interval_cache_files()
    Note over Cache System: Delete 30min & 4hr interval files<br/>Keep only 60min files
    Cache System-->>Streaming Exec: deleted_count
    Streaming Exec->>GLOBAL_CACHE: remove_cache(streaming_id)
    Streaming Exec-->>User: Query results with fresh cache