ramkrishna.s.vasudevan created HBASE-18002:
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             Summary: Investigate why bucket cache filling up in file mode in 
an exisitng file  is slower
                 Key: HBASE-18002
                 URL: https://issues.apache.org/jira/browse/HBASE-18002
             Project: HBase
          Issue Type: Sub-task
          Components: BucketCache
    Affects Versions: 2.0.0
            Reporter: ramkrishna.s.vasudevan
             Fix For: 2.0.0


This issue was observed when we recently did some tests with SSD based bucket 
cache. Similar thing was also reported by @stack and [~danielpol] while doing 
some of these bucket cache related testing.
When we try to preload a bucket cache (in file mode) with a new file the bucket 
cache fills up quite faster and there not much 'failedBlockAdditions'. But when 
the same bucket cache is filled up with a preexisitng file ( that had already 
some entries filled up) this time it has more 'failedBlockAdditions' and the 
cache does not fill up faster. Investigate why this happens. 



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