[jira] [Created] (HBASE-16460) Can't rebuild the BucketAllocator's data structures when BucketCache use FileIOEngine

["Guanghao Zhang (JIRA)" <ji...@apache.org>]

Guanghao Zhang created HBASE-16460:
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             Summary: Can't rebuild the BucketAllocator's data structures when BucketCache use FileIOEngine
                 Key: HBASE-16460
                 URL: https://issues.apache.org/jira/browse/HBASE-16460
             Project: HBase
          Issue Type: Bug
          Components: BucketCache
    Affects Versions: 2.0.0
            Reporter: Guanghao Zhang
            Assignee: Guanghao Zhang


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.

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



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