Simon Riggs <si...@2ndquadrant.com> writes:
> On 7 September 2016 at 13:47, Fujii Masao <masao.fu...@gmail.com> wrote:
>> On Tue, Sep 6, 2016 at 11:41 PM, Simon Riggs <si...@2ndquadrant.com> wrote:
>>> lazy_truncate_heap() was waiting for
>>> VACUUM_TRUNCATE_LOCK_WAIT_INTERVAL, but in microseconds
>>> not milliseconds as originally intended.

>> Don't we need to back-patch this?

> If we do then a database-wide VACUUM on a busy database will take
> substantially longer than it does now.

On the other hand, it's also more likely to successfully perform desired
truncations.

> That may not be perceived as a "fix" by everybody, so we should not do
> it without an explicit agreement by many.

Agreed, but I vote with Fujii-san for back-patching.

                        regards, tom lane


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