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ctdb-scripts: Run a single instance of debug_locks.sh at a give time

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This prevents spamming of logs if multiple lock requests are waiting
and keep timing out.

Also, improve the logging format with separators.

Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Michael Adam <obnox@samba.org>
This commit is contained in:
Amitay Isaacs 2013-11-15 18:59:04 +11:00 committed by Michael Adam
parent 0eeb73c187
commit 86802b05f6
1 changed files with 32 additions and 22 deletions
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30
ctdb/config/debug_locks.sh
View File

@ -14,15 +14,20 @@
loadconfig ctdb
# Create sed expression to convert inodes to names
sed_cmd=$( ls -li "$CTDB_DBDIR"/*.tdb.* "$CTDB_DBDIR_PERSISTENT"/*.tdb.* |
(
flock -n 9 || exit 1
echo "===== Start of debug locks PID=$$ ====="
# Create sed expression to convert inodes to names
sed_cmd=$( ls -li "$CTDB_DBDIR"/*.tdb.* "$CTDB_DBDIR_PERSISTENT"/*.tdb.* |
sed -e "s#${CTDB_DBDIR}/\(.*\)#\1#" \
-e "s#${CTDB_DBDIR_PERSISTENT}/\(.*\)#\1#" |
awk '{printf "s#[0-9]*:[0-9]*:%s #%s #\n", $1, $10}' )
# Parse /proc/locks and extract following information
# pid process_name tdb_name offsets [W]
out=$( cat /proc/locks |
# Parse /proc/locks and extract following information
# pid process_name tdb_name offsets [W]
out=$( cat /proc/locks |
grep -F "POSIX ADVISORY WRITE" |
awk '{ if($2 == "->") { print $6, $7, $8, $9, "W" } else { print $5, $6, $7, $8 } }' |
while read pid rest ; do
@ -30,9 +35,9 @@ out=$( cat /proc/locks |
echo $pid $pname $rest
done | sed -e "$sed_cmd" | grep "\.tdb" )
if [ -n "$out" ]; then
if [ -n "$out" ]; then
# Log information about locks
echo "$out" | logger -t "ctdbd-lock"
echo "$out"
# Find processes that are waiting for locks
dbs=$(echo "$out" | grep "W$" | awk '{print $3}')
@ -45,9 +50,14 @@ if [ -n "$out" ]; then
# For each process waiting, log stack trace
for pid in $pids ; do
gstack $pid | logger -t "ctdbd-lock $pid"
# gcore -o /var/log/core-deadlock-ctdb $pid
echo "----- Stack trace for PID=$pid -----"
gstack $pid
# gcore -o /var/log/core-deadlock-ctdb $pid
done
fi
fi
echo "===== End of debug locks PID=$$ ====="
) 9>"${CTDB_VARDIR}/debug_locks.lock" | script_log "ctdbd-lock"
exit 0