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From "Pavel Yaskevich (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-1714) zero-copy reads
Date Fri, 07 Jan 2011 14:51:46 GMT


Pavel Yaskevich commented on CASSANDRA-1714:

I think we can do the following thing - I or you can create a task "clean all ByteBuffer.array()/arrayOffset()
usages except in ByteBufferUtil" and I will provide a separate patch for that and then I will
submit a patch for this task, because all those modifications I made in Columns/Serializers
are needed to work with updated model aka readBytes. WDYT?

> zero-copy reads
> ---------------
>                 Key: CASSANDRA-1714
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Pavel Yaskevich
>             Fix For: 0.7.1
>         Attachments: CASSANDRA-1714-v2.patch, CASSANDRA-1714-v3.patch, CASSANDRA-1714-v4-trunk.patch,
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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