Flushing Caches

Squirro uses caches to speed up common actions, such as queries. This section shows how to flush these caches when necessary.

Table of Contents

Introduction

In rare circumstances, the Squirro caches may become stale. If and when this happens, please involve Squirro Support, as this is considered a bug.

Caches

There are two different caches managed in Redis. They are stored in different databases (see Accessing Redis Server for background):

• db7: the query cache, which stores the full query responses. Updating this cache can be disabled by using the update_cache option in the item query API call.
• db9: the generic HTTP cache which is used to cache internal calls to the various internal web services.

Flush Cache (Squirro 2.4.6 and newer)

To flush the caches, restart redis-server-cache:

# In the case of CentOS 6 / RHEL 6, run:
monit restart redis-server-cache


# In the case of CentOS 7, run:
systemctl restart redis-server-cache

Flush Cache (Squirro 2.4.5 and older)

To flush a cache, connect to Redis and specify a password, then select the right database, and then flush the cache.

Below is an example session to flush the query cache (database 7).

[squirro@localhost ~]$ redis-cli
127.0.0.1:6379> auth REDIS_PASSWORD
OK
127.0.0.1:6379> select 7
OK
127.0.0.1:6379[7]> dbsize
(integer) 114
127.0.0.1:6379[7]> flushdb
OK
127.0.0.1:6379[7]> dbsize
(integer) 0