Fix flaky test_short_disconnection backup/restore tests#96838
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alexey-milovidov merged 1 commit intomasterfrom Feb 14, 2026
Merged
Fix flaky test_short_disconnection backup/restore tests#96838alexey-milovidov merged 1 commit intomasterfrom
alexey-milovidov merged 1 commit intomasterfrom
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…rt_disconnection_doesnt_stop_restore` When `faster_zk_disconnect_detect.xml` is randomly chosen (which sets `session_timeout_ms=5000`), the ZK connection drop via iptables must be short enough to avoid session expiry. Previously, the drop duration was up to 3-4 seconds via `random_sleep`. Combined with the time since the last heartbeat (~1.7s for a 5s session timeout) and reconnection overhead, the total silence could exceed 5 seconds, causing the ZK session to expire and the backup/restore to fail regardless of the 30-second `failure_after_host_disconnected_for_seconds` threshold. The fix limits the drop duration to 1 second when using the faster ZK disconnect detection config, while keeping the original duration when using default ZK settings. CI report: https://s3.amazonaws.com/clickhouse-test-reports/json.html?PR=96758&sha=d29b41fbe684f8c90ace4fd71828ce0d4ac8b88f&name_0=PR&name_1=Integration%20tests%20%28arm_binary%2C%20distributed%20plan%2C%204%2F4%29 Closes: #80359 Co-Authored-By: Claude Sonnet 4.5 (1M context) <[email protected]>
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Summary
test_short_disconnection_doesnt_stop_backupandtest_short_disconnection_doesnt_stop_restoreby limiting ZK connection drop duration whenfaster_zk_disconnect_detect.xmlis usedsession_timeout_ms=5000), the iptables drop lasting up to 3-4 seconds can cause ZK session expiry due to total heartbeat silence exceeding 5 seconds (drop duration + time since last heartbeat + reconnection overhead)CI report: https://s3.amazonaws.com/clickhouse-test-reports/json.html?PR=96758&sha=d29b41fbe684f8c90ace4fd71828ce0d4ac8b88f&name_0=PR&name_1=Integration%20tests%20%28arm_binary%2C%20distributed%20plan%2C%204%2F4%29
Closes #80359
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