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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4141) RFile metadata not loading from cache
Date Thu, 11 Feb 2016 17:40:18 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15143125#comment-15143125
] 

Keith Turner commented on ACCUMULO-4141:
----------------------------------------

bq. I assume by Major you don't think this would be a big performance impact?

I am uncertain of impact.   This is somewhat mitigated by the fact that open RFiles are cached
on the tserver.  These open rfiles will not reread the metadata.  However a file that gets
popular with scans and needs to open a lot of new RFiles at once will not benefit from the
cache of open rfiles or the file data cache.

> RFile metadata not loading from cache 
> --------------------------------------
>
>                 Key: ACCUMULO-4141
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4141
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 1.6.4, 1.7.0
>            Reporter: Keith Turner
>            Assignee: Keith Turner
>             Fix For: 1.6.6, 1.7.2
>
>
> In [BCFile line 818|https://github.com/apache/accumulo/blob/1.6.4/core/src/main/java/org/apache/accumulo/core/file/rfile/bcfile/BCFile.java#L818]
an attempt to read crypto metadata from cache is made.  Then at [BCFile line 820|https://github.com/apache/accumulo/blob/1.6.4/core/src/main/java/org/apache/accumulo/core/file/rfile/bcfile/BCFile.java#L820]
if that crypto metadata does not exist, some BC file metadata is read from the file.  For
unencrypted files this data will never exist in cache.  Therefore for unencrypted files metadata
will always be read from the file, even when its cached.



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