dpgaspar commented on a change in pull request #8947: [thumbnails] thumbnails
for dashboards and charts
URL:
https://github.com/apache/incubator-superset/pull/8947#discussion_r396446865
##########
File path: docs/installation.rst
##########
@@ -647,6 +647,74 @@ section in `config.py`:
This will cache all the charts in the top 5 most popular dashboards every hour.
For other strategies, check the `superset/tasks/cache.py` file.
+Caching Thumbnails
+------------------
+
+This is an optional feature that can be turned on by activating it's feature
flag on config:
+
+.. code-block:: python
+
+ FEATURE_FLAGS = {
+ "THUMBNAILS": True,
+ "THUMBNAILS_SQLA_LISTENERS": True,
+ }
+
+
+For this feature you will need a cache system and celery workers. All
thumbnails are store on cache and are processed
+asynchronously by the workers.
+
+An example config could be:
+
+.. code-block:: python
+
+ from flask import Flask
+ from werkzeug.contrib.cache import RedisCache
+
+ ...
+
+ class CeleryConfig(object):
+ BROKER_URL = "redis://localhost:6379/0"
+ CELERY_IMPORTS = ("superset.sql_lab", "superset.tasks",
"superset.tasks.thumbnails")
+ CELERY_RESULT_BACKEND = "redis://localhost:6379/0"
+ CELERYD_PREFETCH_MULTIPLIER = 10
+ CELERY_ACKS_LATE = True
+
+
+ CELERY_CONFIG = CeleryConfig
+
+ def init_thumbnail_cache(app: Flask) -> RedisCache:
Review comment:
updated
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