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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-1434) ColumnFamilyOutputFormat performs blocking writes for large batches
Date Wed, 22 Sep 2010 20:51:34 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-1434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-1434:
--------------------------------------

    Attachment: 1434-v5.txt

v5 uses a small batch size and eagerly sends out "incomplete" batches if the reducer falls
behind

> 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, 0003-Switch-RingCache-back-to-multimap.patch,
0004-Replace-Executor-with-map-of-threads.patch, 1434-v3.txt, 1434-v4.txt, 1434-v5.txt
>
>
> By default, ColumnFamilyOutputFormat batches {{mapreduce.output.columnfamilyoutputformat.batch.threshold}}
or {{Long.MAX_VALUE}} mutations, and then performs a blocking write.

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