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Refactor and generalize the ParallelSlot machinery.

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Create a wrapper object, ParallelSlotArray, to encapsulate the
number of slots and the slot array itself, plus some other relevant
bits of information. This reduces the number of parameters we have
to pass around all over the place.

Allow for a ParallelSlotArray to contain slots connected to
different databases within a single cluster. The current clients
of this mechanism don't need this, but it is expected to be used
by future patches.

Defer connecting to databases until we actually need the connection
for something. This is a slight behavior change for vacuumdb and
reindexdb. If you specify a number of jobs that is larger than the
number of objects, the extra connections will now not be used.
But, on the other hand, if you specify a number of jobs that is
so large that it's going to fail, the failure would previously have
happened before any operations were actually started, and now it
won't.

Mark Dilger, reviewed by me.

Discussion: http://postgr.es/m/12ED3DA8-25F0-4B68-937D-D907CFBF08E7@enterprisedb.com
Discussion: http://postgr.es/m/BA592F2D-F928-46FF-9516-2B827F067F57@enterprisedb.com
This commit is contained in:
Robert Haas
2021-03-11 13:17:46 -05:00
parent 2c0cefcd18
commit f71519e545
5 changed files with 351 additions and 174 deletions
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2
src/tools/pgindent/typedefs.list
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@ -404,6 +404,7 @@ ConfigData
ConfigVariable
ConnCacheEntry
ConnCacheKey
ConnParams
ConnStatusType
ConnType
ConnectionStateEnum
@ -1730,6 +1731,7 @@ ParallelHashJoinState
ParallelIndexScanDesc
ParallelReadyList
ParallelSlot
ParallelSlotArray
ParallelState
ParallelTableScanDesc
ParallelTableScanDescData