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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1434) ColumnFamilyOutputFormat performs blocking writes for large batches
Date Sun, 19 Sep 2010 18:34:33 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12912273#action_12912273
] 

Jonathan Ellis commented on CASSANDRA-1434:
-------------------------------------------

> Does it need an UncaughtExceptionHandler that alerts the parent thread?

Probably.  What should the parent thread do?

> In Cassandra, or in general?

In Cassandra.  Flip spent several days in the user IRC channel trying to deal with the load
spikes.

> 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
>
>
> By default, ColumnFamilyOutputFormat batches {{mapreduce.output.columnfamilyoutputformat.batch.threshold}}
or {{Long.MAX_VALUE}} mutations, and then performs a blocking write.

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