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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10322) skipBytes is used extensively, but is slow
Date Wed, 16 Sep 2015 19:00:48 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14790946#comment-14790946
] 

Benedict commented on CASSANDRA-10322:
--------------------------------------

I've pushed [here|https://github.com/belliottsmith/cassandra/tree/10322-2.2] a backport to
2.2, however it looks like 2.2 isn't as badly affected as 3.0. It looks like prior to CASSANDRA-8630
most of our disk access used {{seek}} for {{skipBytes}}

> skipBytes is used extensively, but is slow
> ------------------------------------------
>
>                 Key: CASSANDRA-10322
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10322
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Benedict
>            Assignee: Benedict
>            Priority: Trivial
>             Fix For: 3.0.x
>
>
> We skip a great deal to avoid materializing data. Ironically, however, skipping is just
as (perhaps more) expensive, as it allocates a temporary array of the size of the number of
bytes we want to skip.
> This trivial patch implements {{skipBytes}} more efficiently, and simplifies {{FileUtils.skipBytesFully}}



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