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fix: don't cpipe_push into a closed pipe in tx_status_update

Dmitry Ivanov requested to merge funbringer/2.11.2-fix-tx-status-update into 2.11.2-picodata

Summary

  • fix: don't cpipe_push into a closed pipe in tx_status_update

The bug was discovered during the development of the quorum promote feature -- basically, it causes qpromote_several_outstanding_promotes_test.lua to fail spontaneously. Furthermore, we suspect that this is the underlying cause of lost heartbeats and subsequent severe replication lags.

Close #... Docs follow-up: not necessary / new issue

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