[SAMZA-958] Make store/cache thread safe

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Assignee: Xinyu Liu
• Reporter: Xinyu Liu
• Created: 02/Jun/16 18:24
• Updated: 20/Jul/16 20:24
• Resolved: 20/Jul/16 20:24

Description

All the existing stores/cache need to be thread safe in order to be used by multithreaded tasks. The following changes are made to ensure the thread safety of the stores:

• For CachedStore, use sychronized lock for each public function;
• For current InMemoryKeyValueStore, use ConcurrentSkipListMap as underlying map for thread safety.
• For store Iterator, do not support remove functionality (throw UnsupportedOperationException like RocksDb does today).