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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18002) Investigate why bucket cache filling up in file mode in an exisitng file is slower
Date Wed, 05 Jul 2017 07:33:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16074347#comment-16074347
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Anoop Sam John commented on HBASE-18002:
----------------------------------------

I was thinking there will be some default persistent path  when we use FileIOEngine.  But
ya checking the code, there is none.  

> 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
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 2.0.0
>
>         Attachments: HBASE-18002_1.patch, HBASE-18002_1.patch, HBASE-18002.patch
>
>
> 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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