[jira] [Updated] (MAPREDUCE-2185) Infinite loop at creating splits using CombineFileInputFormat

["Scott Chen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Scott Chen updated MAPREDUCE-2185:
----------------------------------

       Resolution: Fixed
    Fix Version/s: 0.23.0
     Hadoop Flags: [Reviewed]
           Status: Resolved  (was: Patch Available)

I have committed this. Thanks Ram for the fix and dhruba for the review.

> 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
>             Fix For: 0.23.0
>
>         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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