[MAPREDUCE-2185] Infinite loop at creating splits using CombineFileInputFormat

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.23.0
• Component/s: job submission
• Hadoop Flags: Reviewed
• Assignee: Ramkumar Vadali
• Reporter: Hairong Kuang
• Created: 12/Nov/10 20:12
• Updated: 15/Nov/11 00:48
• Resolved: 06/Jun/11 22:25

Description

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

          // 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++) {
             ..
          }