Features

• Support set check recommend period (#384).
• Support replacement in the recommendation (#385).
• Support DNS SRV record lookup for MongoDB (#386, authorized by @pranav377).
• Support set clock error in the cluster (#397).

Fix

• Import and export items with hidden flags and categories (#383).
• Hide hidden items in the latest items, popular items, and item neighbors (#393).
• Fix inaccurate representation of timestamps in float32 (#394).
• Fix potential Redis memory leak (#395).

Upgrade Guide

• Configuration: Replacement has been supported in the configuration, as well as check_recommend_period and epsilon_time.

[server]
# ...
epsilon_time = 5                # clock error in the cluster in seconds

[recommend]
# ...
# The time period to check recommendation for users (minutes). The default values is 1.
check_recommend_period = 1

# Replace historical items back to recommendations.
enable_replacement = false

# Decay the weights of replaced items from positive feedbacks.
positive_replacement_decay = 0.8

# Decay the weights of replaced items from read feedbacks.
read_replacement_decay = 0.6

• Redis: Remove incompatible stale cache.

redis-cli KEYS "offline_recommend*" | xargs redis-cli DEL