Arcus Java Client 1.16.0

2026-02-09 [version 1.16.0]

🐣 New Features

• Support JsonSerializingTranscoder, GenericJsonSerializingTranscoder
• Support SASL Authentication for ASCII/Binary protocol
• Support get and touch (GAT) command
• Support shard key for ketama hashing
• Add set/get replica methods to distribute read traffic for hot items
• Removed some deprecated methods. (old smget, asyncSetBulk, ...)
• Remove timeoutRatioThreshold option.
• Deprecate SMGetMode enum type and setMaxSMGetKeyChunkSize method.

🔧 Enhancements

• Enhance version operation logic after connection established
• Enhance handling InputQ and WriteQ after connection lost when MemcachedNode needs auth process
• Allow queuing operations on nodes going to immediately reconnect
• Enhance ConnectionObserver logic

⚙️ Internal Changes

• Add @Nullable annotation to CollectionDelete#getAdditionalArgs()
• Use more proper key separator for multi-keyed collection operations
• Move checkDupKey method into KeyValidator
• Increase default value of timeoutDurationThreshold from 1000ms to 1600ms
• Call offer() instead of add() for addedQueue

🐛 Bug Fixes

• Reset the use of mget, mgets, " " separator, version info when connection is lost
• Check if writeQ is empty before move its operations to reconnectBlocked
• Remove infinite loop in attemptReconnects()
• Fix bug for ConnectionObserver
• Split piped operations into single-key and multi-key to resolve bug during migration
• Call correct method for overloaded asyncBopUpsert method

📝 Documentation

• Fix docs link references

✅ Testing

• Add printing docker logs on docker compose up -d failure
• Fix example for some APIs

⬆️ Dependency Upgrades

• Upgrade log4j version to 2.25.3.