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Cluster: configurable replicas migration barrier.

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It is possible to configure the min number of additional working slaves
a master should be left with, for a slave to migrate to an orphaned
master.
This commit is contained in:
antirez
2014-01-31 11:12:34 +01:00
parent 3ff1bb4b2e
commit a7d30681c9
6 changed files with 39 additions and 2 deletions
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5
src/cluster.c
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@ -2141,12 +2141,13 @@ void clusterHandleSlaveMigration(int max_slaves) {
/* Step 1: Don't migrate if the cluster state is not ok. */
if (server.cluster->state != REDIS_CLUSTER_OK) return;
/* Step 2: Don't migrate if my master has just me as working slave. */
/* Step 2: Don't migrate if my master will not be left with at least
* 'migration-barrier' slaves after my migration. */
if (mymaster == NULL) return;
for (j = 0; j < mymaster->numslaves; j++)
if (!nodeFailed(mymaster->slaves[j]) &&
!nodeTimedOut(mymaster->slaves[j])) okslaves++;
if (okslaves == 1) return;
if (okslaves <= server.cluster_migration_barrier) return;
/* Step 3: Idenitfy a candidate for migration, and check if among the
* masters with the greatest number of ok slaves, I'm the one with the