#518 dse.ldif is 0 length after server kill or machine kill
Closed: Fixed None Opened 6 years ago by rmeggins.

Doing a kill -9 of ns-slapd, or doing a hard shutdown of a machine while ns-slapd is running, will cause a 0 length dse.ldif to be written


This is easy to reproduce in a VM: disable acpid, then do a force off

Reproduced the problem, now investigating.
There are two issues here:
1] that a dse.ldif has 0 bytes
2] that at restart not the dse.ldif.bak is used, even if 1] could not comletely avoided when server is killed or machine powered off then fallback to dse.ldif.bak would allow to restart

I could reproduce the issue only when powering off a VM, by just killing the slapd process I couldn't.
When reproducing I also always noticed the existence of a 0 byte dse.ldif.tmp file.
From the code path writing updates to dse.ldif this cannot happen.
We have a dse.ldif and a dse.ldif.bak while the server is running. If dse.ldif is to be modified we do:
-create a dse.ldif.tmp (this is the only time a 0 byte dse.ldif* file exists
-write the config to dse.ldif.tmp
-rename dse.ldif to dse.ldif.bak
-rename dse.ldif.tmp to dse.ldif
So I assume the problem occurs in case of a machine crash when recovering the file system, but have no further insight.

But in the above scenario always a useful dse.ldif.bak does exist (maybe without the latest change). At startup the server should not only handle the case of a missing dse.ldif, but also if it exists and is empty as well as if the dse.ldif.tmp is missing or empty.
The provided fix will handle this.

git merge ticket518
Updating 8799a86..b3ca9ee
Fast-forward
ldap/servers/slapd/config.c | 32 +++++++-------------------------
ldap/servers/slapd/dse.c | 60 +++++++++++++++++++++++++++++++++++++++---------------------
ldap/servers/slapd/proto-slap.h | 1 +
3 files changed, 47 insertions(+), 46 deletions(-)

git push origin master
Counting objects: 15, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (8/8), done.
Writing objects: 100% (8/8), 1.52 KiB, done.
Total 8 (delta 6), reused 0 (delta 0)
To ssh://git.fedorahosted.org/git/389/ds.git
8799a86..b3ca9ee master -> master

Pushed to 389-ds-base-1.2.11: commit 8254669

Metadata Update from @lkrispen:
- Issue assigned to lkrispen
- Issue set to the milestone: 1.2.11.19

2 years ago

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