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Ran 24 May 2019 12:23AM UTC

Files 266

Run time 12s

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Committed 24 May 2019 12:10AM UTC coverage: 86.908% (-0.004%) from 86.912%

Job # 14143.1

Build Type

push

travis-ci

Committed by

web-flow

Commit Message

core: fix a deterministic race between the old createSubchannel() and Subchannel.requestConnection(). (#5785)

The old createSubchannel() doesn't require being called from
sync-context, thus its implementation schedules start() on
sync-context because start() has such requirement.  However, if a
LoadBalancer call createSubchannel() in sync-context, start() is
queued and only called after the control exits the sync-context.  If
createSubchannel() is immediately followed by other Subchannel methods
that requires start(), such as requestConnection(), they will fail.
This will be a very common issue as most LoadBalancers call
createSubchannel() in the sync-context.

This fix splits out the real work of start() into internalStart() which
is called by the old createSubchannel().

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