Zhangshunyu commented on pull request #2655:
URL: https://github.com/apache/hadoop/pull/2655#issuecomment-815380601


   it seems the 'cacheUsed' in SimpleReadCacheManager will be 0 when namenode 
restart, this value in stored only in memory. So the 'evictBlocks' would not 
get correct used value to evict the blocks


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