[jira] [Issue Comment Deleted] (CASSANDRA-15396) RandomAccessReader does not override skip or skipBytes so will do a lot of disk io when n is large

["David Capwell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-15396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Capwell updated CASSANDRA-15396:
--------------------------------------
    Comment: was deleted

(was: I rebased to trunk and started perf testing this against a k/v workflow where the value ranges between 100-102400 bytes, in this test I see a noticeable difference between trunk and this patch (p99 of 64ms on trunk vs 25ms with the patch).   I plan to test this more with different value lengths and with other profiles to make sure there isn't a regression under different access patterns.)

> RandomAccessReader does not override skip or skipBytes so will do a lot of disk io when n is large
> --------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-15396
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15396
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local/SSTable
>            Reporter: David Capwell
>            Assignee: David Capwell
>            Priority: Normal
>
> RandomAccessReader does not override skip or skipBytes which becomes a problem when the size of n (the bytes to skip) is larger than a single buffer; in these cases we can rely on seek to avoid the extra disk io.



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