Group flush not working on AWS Elasticache Serverless

@julieadrienne it just returns false. Here are our cache settings in wp-config.php:

define('WP_REDIS_SCHEME',          'tls');
define('WP_REDIS_HOST',            'AWS_ENDPOINT_REDACTED');
define('WP_REDIS_PORT',            6379);
define('WP_REDIS_DISABLE_BANNERS', true);
define('WP_REDIS_IGNORED_GROUPS', ['groups']); // this is the group that we're looking to flush separately

Let me know if I need to enable any debugging option to get more verbose output.

That’s all the constants we’re setting, everything else is as is.

Elasticache Serverless is cluster mode enabled by default I believe. There is no option in the admin panel. From the announcement the client has to support cluster mode but they don’t provide a configuration endpoint.

Here you go, with a couple extra commands. Let me know if you need anything else.

INFO:

# Server
redis_version:7.1
redis_mode:cluster
arch_bits:64
run_id:0

# Replication
role:master
connected_slaves:1
slave0:ip=REDACTED,port=6380,state=online,offset=0,lag=0

# Cluster
cluster_enabled:1

INFO CLUSTER:

# Cluster
cluster_enabled:1

CLUSTER INFO:

cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:2
cluster_size:1
cluster_current_epoch:0
cluster_my_epoch:0
cluster_stats_messages_sent:0
cluster_stats_messages_received:0
total_cluster_links_buffer_limit_exceeded:0

Hi @julieadrienne,

I did give that a try but I’m getting this error: Couldn't map cluster keyspace using any provided seed

CLUSTER SHARDS returns the following:

1) 1) slots
   2) 1) (integer) 0
      2) (integer) 16383
   3) nodes
   4) 1)  1) id
          2) 391fe7f8456c55dd9da927432439baa600000000
          3) ip
          4) 127.0.0.1
          5) endpoint
          6) REDACTED
          7) hostname
          8) REDACTED
          9) role
         10) master
         11) replication-offset
         12) 0
         13) health
         14) online
         15) tls-port
         16) 6379
      2)  1) id
          2) a3745ba00b485da78396197c0cf99a5400000000
          3) ip
          4) 127.0.0.1
          5) endpoint
          6) REDACTED
          7) hostname
          8) REDACTED
          9) role
         10) replica
         11) replication-offset
         12) 0
         13) health
         14) online
         15) tls-port
         16) 6380

I tried both endpoints in both TLS and TCP mode and get the same error every time.

Appreciate your help!

I tried the following configs, all preceded with the phpredis line, unsuccessfully:

define( 'WP_REDIS_CLUSTER', [
    'tcp://FIRST_ENDPOINT:6379?alias=node-01',
    'tcp://SECOND_ENDPOINT:6380?alias=node-02',
] );

define( 'WP_REDIS_CLUSTER', [
    'tls://FIRST_ENDPOINT:6379?alias=node-01',
    'tls://SECOND_ENDPOINT:6380?alias=node-02',
] );

define( 'WP_REDIS_CLUSTER', [
    'tcp://FIRST_ENDPOINT:6379?alias=node-01',
] );

define( 'WP_REDIS_CLUSTER', [
    'tls://FIRST_ENDPOINT:6379?alias=node-01',
] );

define( 'WP_REDIS_CLUSTER', [
    'tcp://SECOND_ENDPOINT:6380?alias=node-01',
] );

define( 'WP_REDIS_CLUSTER', [
    'tls://SECOND_ENDPOINT:6380?alias=node-01',
] );

I’ll note that we’ve been running the non-cluster config (I added it a couple comments above) with no issues apart from the group flush specifically.

• This reply was modified 1 year, 5 months ago by alexl75.

With this configuration, everything works except group flush:

define('WP_REDIS_CLIENT', 'phpredis');
define('WP_REDIS_SCHEME', 'tls');
define('WP_REDIS_HOST', 'AWS_ENDPOINT_REDACTED');
define('WP_REDIS_PORT', 6379);
define('WP_REDIS_DISABLE_BANNERS', true);
define('WP_REDIS_IGNORED_GROUPS', ['groups']); // this is the group that we're looking to flush separately

With this configuration, I get the following error on every page load: Couldn't map cluster keyspace using any provided seed

define('WP_REDIS_CLIENT', 'phpredis');
define('WP_REDIS_CLUSTER', [
    'tls://AWS_ENDPOINT_REDACTED:6379?alias=node-01',
]);
define('WP_REDIS_DISABLE_BANNERS', true);

I did try the 2 configurations I indicated as their own, separately with no other variables.

With WP_REDIS_HOST everything works fine except group flush.

With WP_REDIS_CLUSTER I get this error Couldn't map cluster keyspace using any provided seed on every page load.