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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-18002) Investigate why bucket cache filling up in file mode in an exisitng file is slower
Date Fri, 05 May 2017 12:21:04 GMT
ramkrishna.s.vasudevan created HBASE-18002:
----------------------------------------------

             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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