[HBASE-16460] Can't rebuild the BucketAllocator's data structures when BucketCache uses FileIOEngine

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.1.6, 1.3.1, 1.2.3, 0.98.22, 2.0.0
• Fix Version/s: 1.3.0, 1.1.7, 1.2.4, 2.0.0
• Component/s: BucketCache
• Hadoop Flags: Reviewed
• Assignee: Guanghao Zhang
• Reporter: Guanghao Zhang
• Created: 20/Aug/16 02:59
• Updated: 09/Nov/17 01:32
• Resolved: 06/Sep/16 00:30

Description

When bucket cache use FileIOEngine, it will rebuild the bucket allocator's data structures from a persisted map. So it should first read the map from persistence file then use the map to new a BucketAllocator. But now the code has wrong sequence in retrieveFromFile() method of BucketCache.java.

      BucketAllocator allocator = new BucketAllocator(cacheCapacity, bucketSizes, backingMap, realCacheSize);
      backingMap = (ConcurrentHashMap<BlockCacheKey, BucketEntry>) ois.readObject();