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Add KVSTORE_FREE_EMPTY_DICTS to cluster mode keys / expires kvstore (#13072)

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Currently (following #11695, and #12822), keys kvstore and expires
kvstore both flag with ON_DEMAND, it means that a cluster node will
only allocate a dict when the slot is assigned to it and populated,
but on the other hand, when the slot is unassigned, the dict will
remain allocated.

We considered releasing the dict when the slot is unassigned, but it
causes complications on replicas. On the other hand, from benchmarks
we conducted, it looks like the performance impact of releasing the
dict when it becomes empty and re-allocate it when a key is added
again, isn't huge.

This PR add KVSTORE_FREE_EMPTY_DICTS to cluster mode keys / expires
kvstore.

The impact is about about 2% performance drop, for this hopefully
uncommon scenario.

---------

Co-authored-by: Oran Agra <oran@redislabs.com>
This commit is contained in:
Binbin 2024-03-13 14:30:20 +08:00 committed by GitHub
parent ad28d222ed
commit 3b3d16f748
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1 changed files with 8 additions and 3 deletions
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src/server.c
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@ -2657,10 +2657,15 @@ void initServer(void) {
server.db = zmalloc(sizeof(redisDb)*server.dbnum);
/* Create the Redis databases, and initialize other internal state. */
int slot_count_bits = (server.cluster_enabled) ? CLUSTER_SLOT_MASK_BITS : 0;
int slot_count_bits = 0;
int flags = KVSTORE_ALLOCATE_DICTS_ON_DEMAND;
if (server.cluster_enabled) {
slot_count_bits = CLUSTER_SLOT_MASK_BITS;
flags |= KVSTORE_FREE_EMPTY_DICTS;
}
for (j = 0; j < server.dbnum; j++) {
server.db[j].keys = kvstoreCreate(&dbDictType, slot_count_bits, KVSTORE_ALLOCATE_DICTS_ON_DEMAND);
server.db[j].expires = kvstoreCreate(&dbExpiresDictType, slot_count_bits, KVSTORE_ALLOCATE_DICTS_ON_DEMAND);
server.db[j].keys = kvstoreCreate(&dbDictType, slot_count_bits, flags);
server.db[j].expires = kvstoreCreate(&dbExpiresDictType, slot_count_bits, flags);
server.db[j].expires_cursor = 0;
server.db[j].blocking_keys = dictCreate(&keylistDictType);
server.db[j].blocking_keys_unblock_on_nokey = dictCreate(&objectKeyPointerValueDictType);