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https://issues.apache.org/jira/browse/MAPREDUCE-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13039357#comment-13039357
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dhruba borthakur commented on MAPREDUCE-2185:
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+1 code looks good to me.
> Infinite loop at creating splits using CombineFileInputFormat
> -------------------------------------------------------------
>
> Key: MAPREDUCE-2185
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2185
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: job submission
> Reporter: Hairong Kuang
> Assignee: Ramkumar Vadali
> Attachments: MAPREDUCE-2185.patch
>
>
> This is caused by a missing block in HDFS. So the block's locations are
> empty. The following code adds the block to blockToNodes map but not to
> rackToBlocks map. Later on when generating splits, only blocks in
> rackToBlocks are removed from blockToNodes map. So blockToNodes map can never
> become empty therefore causing infinite loop
> {code}
> // add this block to the block --> node locations map
> blockToNodes.put(oneblock, oneblock.hosts);
> // add this block to the rack --> block map
> for (int j = 0; j < oneblock.racks.length; j++) {
> ..
> }
> {code}
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