| From: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
|---|---|
| To: | Boszormenyi Zoltan <zb(at)cybertec(dot)at> |
| Cc: | Dimitri Fontaine <dfontaine(at)hi-media(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Robert Haas <robertmhaas(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Synchronization levels in SR |
| Date: | 2010-09-03 11:30:04 |
| Message-ID: | AANLkTi=+F3dmiov3aomvPTX77dkCCqsX54OcDemwWjfs@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Sep 3, 2010 at 6:43 PM, Boszormenyi Zoltan <zb(at)cybertec(dot)at> wrote:
> In my patch, when the transactions were waiting for ack from
> the standby, they have already released all their locks, the wait
> happened at the latest possible point in CommitTransaction().
>
> In Fujii's patch (I am looking at synch_rep_0722.patch, is there
> a newer one?)
No ;)
We'll have to create the patch based on the result of the recent
discussion held on other thread.
> the wait happens in RecordTransactionCommit()
> so other transactions still see the sync transaction and most
> importantly, the locks held by the sync transaction will make
> the async transactions waiting for the same lock wait too.
The transaction should be invisible to other transactions until
its replication has been completed. So I put the wait before
CommitTransaction() calls ProcArrayEndTransaction(). Is this unsafe?
Regards,
--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center
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