| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: streaming replication breaks horribly if master crashes |
| Date: | 2010-06-17 16:43:13 |
| Message-ID: | 16250.1276792993@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Fujii Masao <masao(dot)fujii(at)gmail(dot)com> writes:
> On Thu, Jun 17, 2010 at 5:26 AM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>> The real problem here is that we're sending records to the slave which
>> might cease to exist on the master if it unexpectedly reboots. I
>> believe that what we need to do is make sure that the master only
>> sends WAL it has already fsync'd (Tom suggested on another thread that
>> this might be necessary, and I think it's now clear that it is 100%
>> necessary).
> The attached patch changes walsender so that it always sends WAL up to
> LogwrtResult.Flush instead of LogwrtResult.Write.
Applied, along with some minor comment improvements of my own.
regards, tom lane
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