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Commit28e0415

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Update obsolete sentence in README.parallel.
Since 9.6, heavyweight locking is not an abstract and unhandledconcern of the parallel machinery, but rather something to whichwe have a specific approach.
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‎src/backend/access/transam/README.parallel

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@@ -125,9 +125,9 @@ worker. This includes:
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- State related to pending REINDEX operations, which prevents access to
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an index that is currently being rebuilt.
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To preventundetected orunprincipled deadlocks when running in parallel mode,
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this could should eventually handle heavyweight locks in some way. This is
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not implemented yet.
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To prevent unprincipled deadlocks when running in parallel mode, this code
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also arranges for the leader and all workers to participate in group
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locking. See src/backend/storage/lmgr/README for more details.
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Transaction Integration
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=======================

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