The coordinator IMMND on PL-3 was crashed, the active IMMD then elected the new
coordinator on the standby node, SC-2, but failed because IMMND on the SC-2 was
restarted also. As the result, the active IMMD exited and failure-over
happened. After that, SC-2 took active role and found no candidate for new IMMND
coordinator, so cluster was rebooted.
We can prevent this happen if the active IMMD prioritizes to elect the
coordinator which is located on the same site with himself if the IMMND database
is up-to-date.
---
src/imm/immd/immd_proc.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/src/imm/immd/immd_proc.c b/src/imm/immd/immd_proc.c
index 1882eef..34c1415 100644
--- a/src/imm/immd/immd_proc.c
+++ b/src/imm/immd/immd_proc.c
@@ -331,24 +331,34 @@ bool immd_proc_elect_coord(IMMD_CB *cb, bool new_active)
*/
} else {
/* Try to elect a new coord. */
+ IMMD_IMMND_INFO_NODE *candidate_coord_node = NULL;
cb->payload_coord_dest = 0LL;
memset(&key, 0, sizeof(MDS_DEST));
immd_immnd_info_node_getnext(&cb->immnd_tree, &key,
&immnd_info_node);
+
+ // Election priority:
+ // 1) Coordinator on active node
+ // 2) Coordinator on standby node
+ // 3) Coordinator on PL node if SC absence is allowed.
while (immnd_info_node) {
key = immnd_info_node->immnd_dest;
if ((immnd_info_node->isOnController) &&
(immnd_info_node->epoch == cb->mRulingEpoch)) {
- /*We found a new candidate for cordinator */
+ candidate_coord_node = immnd_info_node;
immnd_info_node->isCoord = true;
- break;
+ if (immnd_info_node->immnd_key == cb->node_id) {
+ /* Found a new candidate on active SC */
+ break;
+ }
}
immd_immnd_info_node_getnext(&cb->immnd_tree, &key,
&immnd_info_node);
}
- if (!immnd_info_node && cb->mScAbsenceAllowed) {
+ immnd_info_node = candidate_coord_node;
+ if (!immnd_info_node && cb->mScAbsenceAllowed) {
/* If SC absence is allowed and no SC based IMMND is
available then elect an IMMND coord at a payload.
Note this means that an IMMND at a payload may be
--
1.9.1
------------------------------------------------------------------------------
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