Re: Replication options?

On 8/12/2004 12:02 PM, Joshua D. Drake wrote:

>> To make a transaction durable, the changes first have to be recorded in
>> PostgreSQL's crash recovery WAL. Only after that data is flushed to the
>> disk it can be assumed that the transaction will be redone in the case
>> of an immediately following crash. If a replication system now logs the
>> commit event before the WAL operation happens, it is possible that the
>> transaction does not commit on the master due to a crash, but it will be
>> replayed and committed on the slaves. On the other side if the
>> replication logging of the commit is done after the WAL operation, it
>> must be assured that WAL replay during crash recovery also causes
>> replication log journal to be recovered or repeated. In short, the
>> replication log must be covered by the same redo mechanism the crash
>> recovery system uses.
>
> This I will have to verify with our programmers as to exactly "when" the
> replication occurs.

Joshua,

you never followed up to this one.


Jan

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