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Define "idle" connections that are safe to close (no transactions, no held locks)
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Authored by epriestley on Nov 20 2018, 6:47 PM.

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Summary

Ref T13216. See PHI916. When workers are spending 20 minutes in ssh ... ./run-huge-build.sh, we'd like to drop database connections to reduce the cost of having a large fleet of build agents.

To prepare for this, define what it means for a connection to be "idle": no held locks and no open transactions. These connections are safe to close without loss of state.

Test Plan

See next revision for use.

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rPHU libphutil
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