diff options
| author | dgaudet <dgaudet@unknown> | 1997-04-27 09:45:00 +0200 |
|---|---|---|
| committer | dgaudet <dgaudet@unknown> | 1997-04-27 09:45:00 +0200 |
| commit | 8c4d270fd08fcd57c863658ec05502fc9f78459e (patch) | |
| tree | 19a4130696ffa113296f78412c7320f548534be3 /docs/manual/stopping.html.en | |
| parent | Fix bogus URLs. (diff) | |
| download | apache2-8c4d270fd08fcd57c863658ec05502fc9f78459e.tar.xz apache2-8c4d270fd08fcd57c863658ec05502fc9f78459e.zip | |
Deal with EINTR while processing scoreboard file. Fix graceful restart
for scoreboard files.
Reviewed by: Randy, Roy
Submitted by:
Obtained from:
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@78035 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'docs/manual/stopping.html.en')
| -rw-r--r-- | docs/manual/stopping.html.en | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/docs/manual/stopping.html.en b/docs/manual/stopping.html.en index 0cb67f515d..e333deb851 100644 --- a/docs/manual/stopping.html.en +++ b/docs/manual/stopping.html.en @@ -57,11 +57,6 @@ set to zero when a <code>HUP</code> is sent. <p><b>Note:</b> prior to release 1.2b9 this code is quite unstable and shouldn't be used at all. -<p><b>Note:</b> Architectures that use an on disk <a -href="mod/core.html#scoreboardfile">ScoreBoardFile</a> are not supported -on graceful restarts. See the ScoreBoardFile documentation for a method -to determine if your architecture uses a file. - <p>The <code>USR1</code> signal causes the parent process to <i>advise</i> the children to exit after their current request (or to exit immediately if they're not serving anything). The parent re-reads its configuration @@ -112,11 +107,15 @@ have the "right" feature set we have eliminated as many as we can. But it should be noted that there still do exist race conditions on certain architectures. -<p>Architectures that use an on disk <a -href="mod/core.html#scoreboardfile">ScoreBoardFile</a> have the potential -to corrupt their scoreboards whenever a signal is received (by the -parent or children). It is -possible for the server to forget about some children when this happens. +<p>Architectures that use an on disk +<a href="mod/core.html#scoreboardfile">ScoreBoardFile</a> +have the potential to corrupt their scoreboards. This can result in +the "bind: Address already in use" (after <code>HUP</code>) or +"long lost child came home!" (after <code>USR1</code>). The former is +a fatal error, while the latter just causes the server to lose a scoreboard +slot. So it might be advisable to use graceful restarts, with +an occasional hard restart. These problems are very difficult to work +around, but fortunately most architectures do not require a scoreboard file. See the ScoreBoardFile documentation for a method to determine if your architecture uses it. |