[jira] [Commented] (CASSANDRA-3264) Add wide row paging for ColumnFamilyInputFormat and ColumnFamilyOutputFormat

["T Jake Luciani (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-3264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13141194#comment-13141194 ] 

T Jake Luciani commented on CASSANDRA-3264:
-------------------------------------------

This isn't a transpose!

This is paging....  Maybe an example will help...

if you set column.paging.size = 3

RowA => [col1, col2, col3,..., colN]

Would become:

RowA => [col1, col2, col3]
RowA => [col4, col5, col6]
RowA => [col7, col8, col9]



                
> Add wide row paging for ColumnFamilyInputFormat and ColumnFamilyOutputFormat
> ----------------------------------------------------------------------------
>
>                 Key: CASSANDRA-3264
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3264
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Hadoop
>            Reporter: T Jake Luciani
>              Labels: lhf
>             Fix For: 1.0.2
>
>
> Hadoop input/output formats currently can OOM on wide rows.
> We can add a new option to the ConfigHelper like columnPagingSize with a default of Integer.MAX_VALUE.
> The input format would page the row internally rather than pull it over at once.
> The output format could also use this to avoid sending huge rows over at once.

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