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bg worker: patch 6 of 6 - ooo messages

From: Markus Wanner <markus(at)bluegap(dot)ch>
To: PostgreSQL-development Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: bg worker: patch 6 of 6 - ooo messages
Date: 2010-07-13 14:31:44
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Lists: pgsql-hackers
Finally, this patch adds the capability to cache out-of-order messages 
for workers within the coordinator process. Unlike the cache of jobs, 
which basically are messages as well, these messages don't trigger a 
job, but might provide additional information or data payload to a 
worker that's already processing a job.

In case of Postgres-R, the very first change set received starts an 
applicator job, while every subsequent change set as well as the final 
commit decision are such ooo-messages, which are forwarded to the same 

A parallel querying feature might want to use similar ooo messages for 
data payload, forth and back. However, simpler jobs like vacuum don't 
necessarily need this.

Attachment: step6-ooo.diff
Description: text/x-diff (7.5 KB)

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Subject: Re: explain.c: why trace PlanState and Plan trees separately?
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Subject: bg worker: patch 5 of 6 - splitting

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