diff options
| -rw-r--r-- | ctdb/common/ctdb_ltdb.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/ctdb/common/ctdb_ltdb.c b/ctdb/common/ctdb_ltdb.c index b18f267480..132108e69b 100644 --- a/ctdb/common/ctdb_ltdb.c +++ b/ctdb/common/ctdb_ltdb.c @@ -229,6 +229,21 @@ static void lock_fetch_callback(void *p) /* do a non-blocking ltdb_fetch with a locked record, deferring this ctdb request until we have the chainlock + + It does the following: + + 1) tries to get the chainlock. If it succeeds, then it fetches the record, and + returns 0 + + 2) if it fails to get a chainlock immediately then it sets up a + non-blocking chainlock via ctdb_lockwait, and when it gets the + chainlock it re-submits this ctdb request to the main packet + receive function + + This effectively queues all ctdb requests that cannot be + immediately satisfied until it can get the lock. This means that + the main ctdb daemon will not block waiting for a chainlock held by + a client */ int ctdb_ltdb_lock_fetch_requeue(struct ctdb_db_context *ctdb_db, TDB_DATA key, struct ctdb_ltdb_header *header, |