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https://issues.apache.org/jira/browse/HADOOP-6039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12719638#action_12719638
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Owen O'Malley commented on HADOOP-6039:
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This patch should reintroduce checkInputSplits into
org.apache.hadoop.mapreduce.InputFormat. This method should be documented as
*optional*. It will only be invoked if Java code is doing the submission to
detect errors in the user's job configuration, such as missing or
read-protected input directory, before the job is submitted to the cluster.
> Computing Input Splits on the MR Cluster
> ----------------------------------------
>
> Key: HADOOP-6039
> URL: https://issues.apache.org/jira/browse/HADOOP-6039
> Project: Hadoop Core
> Issue Type: New Feature
> Components: mapred
> Reporter: Philip Zeyliger
>
> Instead of computing the input splits as part of job submission, Hadoop could
> have a separate "job task type" that computes the input splits, therefore
> allowing that computation to happen on the cluster.
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