caleb-brown/redict
1
0
Fork 0
mirror of https://codeberg.org/redict/redict.git synced 2025-01-22 16:18:28 -05:00
Code Issues Actions Packages Projects Releases Wiki Activity

Cluster: refactor ping/data delay handling.

Browse Source
This commit is contained in:
antirez 2020-05-08 18:10:16 +02:00
parent 00a3bc4359
commit 79de9d6c78
1 changed files with 13 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
src/cluster.c
View File

@ -3564,15 +3564,17 @@ void clusterCron(void) {
/* If we are not receiving any data for more than half the cluster
* timeout, reconnect the link: maybe there is a connection
* issue even if the node is alive. */
mstime_t ping_delay = now - node->ping_sent;
mstime_t data_delay = now - node->data_received;
if (node->link && /* is connected */
now - node->link->ctime >
server.cluster_node_timeout && /* was not already reconnected */
node->ping_sent && /* we already sent a ping */
node->pong_received < node->ping_sent && /* still waiting pong */
/* and we are waiting for the pong more than timeout/2 */
now - node->ping_sent > server.cluster_node_timeout/2 &&
ping_delay > server.cluster_node_timeout/2 &&
/* and in such interval we are not seeing any traffic at all. */
now - node->data_received > server.cluster_node_timeout/2)
data_delay > server.cluster_node_timeout/2)
{
/* Disconnect the link, it will be reconnected automatically. */
freeClusterLink(node->link);
@ -3604,18 +3606,18 @@ void clusterCron(void) {
/* Check only if we have an active ping for this instance. */
if (node->ping_sent == 0) continue;
/* Compute the delay of the PONG. Note that if we already received
* the PONG, then node->ping_sent is zero, so can't reach this
* code at all. */
mstime_t delay = now - node->ping_sent;
/* We consider every incoming data as proof of liveness, since
/* Check if this node looks unreachable.
* Note that if we already received the PONG, then node->ping_sent
* is zero, so can't reach this code at all, so we don't risk of
* checking for a PONG delay if we didn't sent the PING.
*
* We also consider every incoming data as proof of liveness, since
* our cluster bus link is also used for data: under heavy data
* load pong delays are possible. */
mstime_t data_delay = now - node->data_received;
if (data_delay < delay) delay = data_delay;
mstime_t node_delay = (ping_delay < data_delay) ? ping_delay :
data_delay;
if (delay > server.cluster_node_timeout) {
if (node_delay > server.cluster_node_timeout) {
/* Timeout reached. Set the node as possibly failing if it is
* not already in this state. */
if (!(node->flags & (CLUSTER_NODE_PFAIL|CLUSTER_NODE_FAIL))) {