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From "Stu Hood (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1434) ColumnFamilyOutputFormat performs blocking writes for large batches
Date Thu, 16 Sep 2010 14:51:33 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910175#action_12910175
] 

Stu Hood commented on CASSANDRA-1434:
-------------------------------------

Sent via e-mail while I was on vacation:
{quote}
I wanted to dodge object creation, but I guess I assumed that Multimap created Set and Collection
facades for every call. Also, there didn't appear to be a way to iterate over unique keys
without a facade.
{quote}

> ColumnFamilyOutputFormat performs blocking writes for large batches
> -------------------------------------------------------------------
>
>                 Key: CASSANDRA-1434
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1434
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Hadoop
>            Reporter: Stu Hood
>            Assignee: Stu Hood
>             Fix For: 0.7 beta 2
>
>         Attachments: 0001-Switch-away-from-Multimap-and-fix-regression-introdu.patch,
0002-Improve-concurrency-and-add-basic-retries-by-attempt.patch
>
>
> By default, ColumnFamilyOutputFormat batches {{mapreduce.output.columnfamilyoutputformat.batch.threshold}}
or {{Long.MAX_VALUE}} mutations, and then performs a blocking write.

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