Token coefficient is used only when nodelist is specified and contains
at least 3 nodes. If so, real token timeout is then computed as
token + (number_of_nodes - 2) * token_coef. This allows cluster to
scale without manually changing token timeout every time new
node is added. This value can be set to 0 resulting in effective
removal of this feature.
Signed-off-by: Jan Friesse <jfriesse@xxxxxxxxxx>
---
exec/coroparse.c | 1 +
exec/totemconfig.c | 8 ++++++++
man/corosync.conf.5 | 12 ++++++++++++
3 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/exec/coroparse.c b/exec/coroparse.c
index 425e5d6..2b61d94 100644
--- a/exec/coroparse.c
+++ b/exec/coroparse.c
@@ -541,6 +541,7 @@ static int main_config_parser_cb(const char *path,
(strcmp(path, "totem.nodeid") == 0) ||
(strcmp(path, "totem.threads") == 0) ||
(strcmp(path, "totem.token") == 0) ||
+ (strcmp(path, "totem.token_coef") == 0) ||
(strcmp(path, "totem.token_retransmit") == 0) ||
(strcmp(path, "totem.hold") == 0) ||
(strcmp(path, "totem.token_retransmits_before_loss_const") == 0) ||
diff --git a/exec/totemconfig.c b/exec/totemconfig.c
index 228f162..ed3d6bd 100644
--- a/exec/totemconfig.c
+++ b/exec/totemconfig.c
@@ -62,6 +62,7 @@
#define TOKEN_RETRANSMITS_BEFORE_LOSS_CONST 4
#define TOKEN_TIMEOUT 1000
+#define TOKEN_COEFFICIENT 650
#define JOIN_TIMEOUT 50
#define MERGE_TIMEOUT 200
#define DOWNCHECK_TIMEOUT 1000
@@ -157,12 +158,19 @@ static void totem_volatile_config_set_value (struct totem_config *totem_config,
*/
static void totem_volatile_config_read (struct totem_config *totem_config, const char *deleted_key)
{
+ uint32_t u32;
totem_volatile_config_set_value(totem_config, "totem.token_retransmits_before_loss_const", deleted_key,
TOKEN_RETRANSMITS_BEFORE_LOSS_CONST, 0);
totem_volatile_config_set_value(totem_config, "totem.token", deleted_key, TOKEN_TIMEOUT, 0);
+ if (totem_config->interface_count > 0 && totem_config->interfaces[0].member_count > 2) {
+ u32 = TOKEN_COEFFICIENT;
+ icmap_get_uint32("totem.token_coef", &u32);
+ totem_config->token_timeout += (totem_config->interfaces[0].member_count - 2) * u32;
+ }
+
totem_volatile_config_set_value(totem_config, "totem.max_network_delay", deleted_key, MAX_NETWORK_DELAY, 0);
totem_volatile_config_set_value(totem_config, "totem.window_size", deleted_key, WINDOW_SIZE, 0);
diff --git a/man/corosync.conf.5 b/man/corosync.conf.5
index 5d16152..55d1a82 100644
--- a/man/corosync.conf.5
+++ b/man/corosync.conf.5
@@ -300,6 +300,18 @@ milliseconds in addition to this timeout.
The default is 1000 milliseconds.
.TP
+token_coef
+This value is used only when
+.B nodelist
+section is specified and contains at least 3 nodes. If so, real token timeout
+is then computed as token + (number_of_nodes - 2) * token_coef. This allows
+cluster to scale without manually changing token timeout every time new
+node is added. This value can be set to 0 resulting in effective removal of
+this feature.
+
+The default is 650 milliseconds.
+
+.TP
token_retransmit
This timeout specifies in milliseconds after how long before receiving a token
the token is retransmitted. This will be automatically calculated if token
--
1.7.1
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