On 27/07/10 13:29, Fujii Masao wrote:
On Tue, Jul 27, 2010 at 7:39 PM, Yeb Havinga<yebhavi...@gmail.com> wrote:
Fujii Masao wrote:
I noted the changes in XlogSend where instead of *caughtup = true/false it
now returns !MyWalSnd->sndrqst. That value is initialized to false in that
procedure and it cannot be changed to true during execution of that
procedure, or can it?
That value is set to true in WalSndWakeup(). If WalSndWakeup() is called
after initialization of that value in XLogSend(), *caughtup is set to false.
There's some race conditions with the signaling. If another process
finishes XLOG flush and sends the signal when a walsender has just
finished one iteration of its main loop, walsender will reset
xlogsend_requested and go to sleep. It should not sleep but send the
pending WAL immediately.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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