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From "Shyam Gavulla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4522) DBOutputFormat Times out on large batch inserts
Date Tue, 01 Mar 2016 03:18:18 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15173166#comment-15173166
] 

Shyam Gavulla commented on MAPREDUCE-4522:
------------------------------------------

[~ozawa] I made the configuration change. Added a property  in mapred-default.xml 
<property>
  <name>mapreduce.output.dboutputformat.batch-size</name>
  <value>1000</value>
  <description>The batch size of SQL statements that will be executed before reporting
progress. Default is 1000</description>
</property>

Added a constant in MRJobConfig.java - public static final String MR_DBOUTPUTFORMAT_BATCH_SIZE="mapreduce.output.dboutputformat.batch-size";

Let me know if this good and I will create a patch. 

> DBOutputFormat Times out on large batch inserts
> -----------------------------------------------
>
>                 Key: MAPREDUCE-4522
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4522
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: task-controller
>    Affects Versions: 0.20.205.0
>            Reporter: Nathan Jarus
>              Labels: newbie
>
> In DBRecordWriter#close(), progress is never updated. In large batch inserts, this can
cause the reduce task to time out due to the amount of time it takes the SQL engine to process
that insert. 
> Potential solutions I can see:
> Don't batch inserts; do the insert when DBRecordWriter#write() is called (awful)
> Spin up a thread in DBRecordWriter#close() and update progress in that. (gross)
> I can provide code for either if you're interested. 



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