branch-4.0: [fix](streaming-job) start counting task max interval after the first record is received #63141#63162
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… record is received (#63141) ### What problem does this PR solve? Problem Summary: For PG CDC streaming jobs, when a task creates a fresh logical replication connection, the walsender must re-decode the WAL region from `slot.restart_lsn` up to the client-supplied `startLsn` before any event can be emitted. On high RTT networks (e.g. cross-region Aurora) this catch-up alone can take several seconds. Under the previous behavior the task's `maxInterval` window started the moment the task entered `writeRecords`, so the time spent on WAL position lookup + walsender catch-up was charged against the interval. With `max_interval=10s` this consistently caused tasks to finish with `0 records, 0 heartbeats`, the slot's `confirmed_flush_lsn` never advanced, and every following task repeated the same catch-up — the slot was effectively stuck and replication lag grew indefinitely. This PR delays the start of the `maxInterval` countdown until the first record (or heartbeat) is actually received from the source reader, so the per-task interval governs the real streaming window rather than being consumed by setup. The FE-side `streaming_task_timeout_multiplier * maxIntervalSec` still acts as the hard ceiling.
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Thank you for your contribution to Apache Doris. Please clearly describe your PR:
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run buildall |
yiguolei
approved these changes
May 13, 2026
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Cherry-picked from #63141