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From "Radim Kolar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5473) Use mmaped buffered write for ldb segments
Date Mon, 15 Apr 2013 19:06:16 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13632044#comment-13632044
] 

Radim Kolar commented on CASSANDRA-5473:
----------------------------------------

i have not checked other patch code but you have to create file part, mmap it, write to memory,
unmap, enlarge file, mmap next segment, write, unmap and truncate file to desired size.
                
> Use mmaped buffered write for ldb segments
> ------------------------------------------
>
>                 Key: CASSANDRA-5473
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5473
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Radim Kolar
>              Labels: performance
>         Attachments: leveldb.ods
>
>
> it increases throughput, especially in compations.

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