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Fix flaky pubsub tests with retry mechanism for PUBLISH/SPUBLISH commands #4384

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Fix flaky pubsub tests with retry mechanism for PUBLISH/SPUBLISH commands #4384

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Problem

The tests test_async_cluster_restore_resp3_pubsub_state_after_scale_out and test_async_cluster_restore_resp3_pubsub_state_passive_disconnect were failing intermittently due to a race condition during cluster topology changes.

The issue occurred when:

  1. A cluster scales out from 3 to 6 nodes or experiences connection disruptions
  2. PUBLISH/SPUBLISH commands are executed before all subscribers have fully reconnected and resubscribed
  3. The commands return Ok(Value::Int(1)) instead of the expected Ok(Value::Int(2)), indicating only 1 of 2 expected subscribers received the message

Solution

Added robust retry logic with exponential backoff for PUBLISH and SPUBLISH operations during cluster topology changes:

  • New helper functions: retry_publish_until_expected_subscribers and retry_spublish_until_expected_subscribers
  • Exponential backoff: Starts with 100ms delay, doubles each retry up to 10 attempts (max ~51.2s total)
  • Graceful degradation: Returns the last result if expected subscriber count isn't reached after all retries

Changes

  • Added retry helper functions to test_cluster_async.rs
  • Updated all PUBLISH and SPUBLISH commands in both failing tests to use the retry mechanism
  • Fixed type compatibility issues (using ClusterConnection instead of MultiplexedConnection)
  • Fixed duration multiplication for exponential backoff

Testing

  • Both previously failing tests now pass consistently across multiple runs
  • All 96 tests in test_cluster_async.rs continue to pass
  • No regressions introduced to existing functionality

The fix ensures tests are resilient to timing variations during cluster topology changes while maintaining the same test coverage and expectations.

Fixes #3827.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

  • ask_with_extra_nodes
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • esm.ubuntu.com
    • Triggering command: /usr/lib/apt/methods/https (dns block)
  • foo
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • node
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • rebuild_with_extra_nodes
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • refresh_topology_client_init
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • refresh_topology_moved
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_can_be_created_with_partial_slot_coverage
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_do_not_retry_when_receiver_was_dropped
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_dont_route_to_a_random_on_non_key_based_cmd
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_fan_out_and_aggregate_logical_array_response
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_fan_out_and_aggregate_numeric_response
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_fan_out_and_return_all_succeeded_response
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_fan_out_and_return_one_succeeded_response
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_non_retryable_io_error_should_not_retry
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_pass_errors_from_split_multi_shard_command
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_read_from_primary_when_primary_loading
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_reconnect_even_with_zero_retries
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_reroute_from_replica_if_in_loading_state
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_reset_routing_if_redirect_fails
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_retry_safe_io_error_should_be_retried
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_route_according_to_passed_argument
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_route_to_random_on_key_based_cmd
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_saves_reconnected_connection
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • test_async_cluster_update_slots_based_on_moved_error_no_change
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • tryagain
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)
  • tryagain_exhaust_retries
    • Triggering command: /home/REDACTED/work/valkey-glide/valkey-glide/glide-core/redis-rs/target/debug/deps/test_cluster_async-5f1c548054fb4f2b --nocapture (dns block)

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@Copilot @avifenesh
Fix flaky pubsub tests with retry mechanism for PUBLISH/SPUBLISH comm…
474713a 
…ands

Co-authored-by: avifenesh <55848801+avifenesh@users.noreply.github.com>
@barshaul barshaul mentioned this pull request Jul 15, 2025
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@Copilot Copilot AI changed the title [WIP] [Flaky Test] redis-rs cluster_async Fix flaky pubsub tests with retry mechanism for PUBLISH/SPUBLISH commands Jul 15, 2025
@Copilot Copilot AI requested a review from avifenesh July 15, 2025 12:04
Copilot finished work on behalf of avifenesh July 15, 2025 12:04
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@Copilot @avifenesh
Fix linting issues by removing trailing whitespace from test functions
cffb8e0 
Co-authored-by: avifenesh <55848801+avifenesh@users.noreply.github.com>
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Copilot AI commented Jul 15, 2025

lints failures

Fixed the linting failures by removing trailing whitespace from the test functions in commit cffb8e0.

Copilot finished work on behalf of avifenesh July 15, 2025 12:48
@avifenesh avifenesh marked this pull request as ready for review July 15, 2025 15:28
@avifenesh avifenesh requested a review from a team as a code owner July 15, 2025 15:28
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[Flaky Test] redis-rs cluster_async
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