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https://issues.apache.org/jira/browse/HBASE-9931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13818049#comment-13818049
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Dave Latham commented on HBASE-9931:
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Yeah - it's in the scans. CopyTable doesn't use reducers at all.
> Optional setBatch for CopyTable to copy large rows in batches
> -------------------------------------------------------------
>
> Key: HBASE-9931
> URL: https://issues.apache.org/jira/browse/HBASE-9931
> Project: HBase
> Issue Type: Improvement
> Components: mapreduce
> Reporter: Dave Latham
>
> We've had CopyTable jobs fail because a small number of rows are wide enough
> to not fit into memory. If we could specify the batch size for CopyTable
> scans that shoud be able to break those large rows up into multiple
> iterations to save the heap.
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