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libceph: monc hunt rate is 3s with backoff up to 30s

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Unless we are in the process of setting up a client (i.e. connecting to
the monitor cluster for the first time), apply a backoff: every time we
want to reopen a session, increase our timeout by a multiple (currently
2); when we complete the connection, reduce that multipler by 50%.

Mirrors ceph.git commit 794c86fd289bd62a35ed14368fa096c46736e9a2.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov 2016-01-21 16:33:19 +01:00
parent 58d81b1294
commit 168b9090c7
3 changed files with 22 additions and 9 deletions
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3
include/linux/ceph/libceph.h
View File

@ -68,8 +68,11 @@ struct ceph_options {
#define CEPH_OSD_KEEPALIVE_DEFAULT msecs_to_jiffies(5 * 1000)
#define CEPH_OSD_IDLE_TTL_DEFAULT msecs_to_jiffies(60 * 1000)
#define CEPH_MONC_HUNT_INTERVAL msecs_to_jiffies(3 * 1000)
#define CEPH_MONC_PING_INTERVAL msecs_to_jiffies(10 * 1000)
#define CEPH_MONC_PING_TIMEOUT msecs_to_jiffies(30 * 1000)
#define CEPH_MONC_HUNT_BACKOFF 2
#define CEPH_MONC_HUNT_MAX_MULT 10
#define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
#define CEPH_MSG_MAX_MIDDLE_LEN (16*1024*1024)

3
include/linux/ceph/mon_client.h
View File

@ -72,6 +72,9 @@ struct ceph_mon_client {
unsigned long sub_renew_sent;
struct ceph_connection con;
bool had_a_connection;
int hunt_mult; /* [1..CEPH_MONC_HUNT_MAX_MULT] */
/* pending generic requests */
struct rb_root generic_request_tree;
int num_generic_requests;

25
net/ceph/mon_client.c
View File

@ -171,6 +171,12 @@ static void __open_session(struct ceph_mon_client *monc)
pick_new_mon(monc);
if (monc->had_a_connection) {
monc->hunt_mult *= CEPH_MONC_HUNT_BACKOFF;
if (monc->hunt_mult > CEPH_MONC_HUNT_MAX_MULT)
monc->hunt_mult = CEPH_MONC_HUNT_MAX_MULT;
}
monc->sub_renew_after = jiffies; /* i.e., expired */
monc->sub_renew_sent = 0;
@ -192,11 +198,6 @@ static void __open_session(struct ceph_mon_client *monc)
__send_prepared_auth_request(monc, ret);
}
static bool __sub_expired(struct ceph_mon_client *monc)
{
return time_after_eq(jiffies, monc->sub_renew_after);
}
/*
* Reschedule delayed work timer.
*/
@ -204,11 +205,11 @@ static void __schedule_delayed(struct ceph_mon_client *monc)
{
unsigned long delay;
if (monc->cur_mon < 0 || __sub_expired(monc)) {
delay = 10 * HZ;
} else {
if (monc->hunting)
delay = CEPH_MONC_HUNT_INTERVAL * monc->hunt_mult;
else
delay = CEPH_MONC_PING_INTERVAL;
}
dout("__schedule_delayed after %lu\n", delay);
schedule_delayed_work(&monc->delayed_work,
round_jiffies_relative(delay));
@ -902,6 +903,8 @@ int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
monc->hunting = true;
monc->sub_renew_after = jiffies;
monc->sub_renew_sent = 0;
monc->had_a_connection = false;
monc->hunt_mult = 1;
INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
monc->generic_request_tree = RB_ROOT;
@ -959,6 +962,10 @@ static void finish_hunting(struct ceph_mon_client *monc)
if (monc->hunting) {
dout("%s found mon%d\n", __func__, monc->cur_mon);
monc->hunting = false;
monc->had_a_connection = true;
monc->hunt_mult /= 2; /* reduce by 50% */
if (monc->hunt_mult < 1)
monc->hunt_mult = 1;
}
}