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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1714) zero-copy reads
Date Tue, 04 Jan 2011 17:04:47 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977346#action_12977346
] 

Jonathan Ellis commented on CASSANDRA-1714:
-------------------------------------------

ICS2 FileChannel will *only* help multinode clusters.  So if you're not seeing any speed difference
on a single node cluster, then that's going to be a waste of time.

Let's speed up local reads first, then worry about the filechannel serialization later.  And
if it turns out we can't do the first, then let's not bother with the second.

> zero-copy reads
> ---------------
>
>                 Key: CASSANDRA-1714
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1714
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Pavel Yaskevich
>             Fix For: 0.7.1
>
>         Attachments: CASSANDRA-1714.patch, zerocopy.txt
>
>   Original Estimate: 32h
>  Remaining Estimate: 32h
>
> Since we are already using mmap'd ByteBuffers in MappedFileDataInput we should be able
to do zero-copy reads (via buffer.slice()), which would give us better performance than CASSANDRA-1651
without having to worry about buffer management.

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