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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3122) SSTableSimpleUnsortedWriter take long time when inserting big rows
Date Fri, 02 Sep 2011 17:25:09 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13096148#comment-13096148
] 

Jonathan Ellis commented on CASSANDRA-3122:
-------------------------------------------

+1

I also note that newSuperColumn in abstract writer is unused.

> SSTableSimpleUnsortedWriter take long time when inserting big rows
> ------------------------------------------------------------------
>
>                 Key: CASSANDRA-3122
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3122
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.8.3
>            Reporter: Benoit Perroud
>            Priority: Minor
>             Fix For: 0.8.5
>
>         Attachments: 3122.patch, SSTableSimpleUnsortedWriter-v2.patch, SSTableSimpleUnsortedWriter.patch
>
>
> In SSTableSimpleUnsortedWriter, when dealing with rows having a lot of columns, if we
call newRow several times (to flush data as soon as possible), the time taken by the newRow()
call is increasing non linearly. This is because when newRow is called, we merge the size
increasing existing CF with the new one.

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