[MAPREDUCE-5076] CombineFileInputFormat can create splits that exceed maxSplitSize

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Assignee: Sandy Ryza
• Reporter: Sandy Ryza
• Created: 16/Mar/13 00:45
• Updated: 18/Mar/13 21:21

Description

I ran a local job with CombineFileInputFormat using an 80 MB file and a max split size of 32 MB (the default local FS block size). The job ran with two splits of 32 MB, and the last 16 MB were just omitted.

This appears to be caused by a subtle bug in getMoreSplits, in which the code that generates the splits from the blocks expects the 16 MB block to be at the end of the block list. But the code that generates the blocks does not respect this.