[MAPREDUCE-841] Protect Job Tracker against memory exhaustion due to very large InputSplit or JobConf objects

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.20.1
• Component/s: jobtracker
• Assignee: Unassigned
• Reporter: Hong Tang
• Created: 08/Aug/09 02:45
• Updated: 23/Jul/14 20:24
• Resolved: 23/Jul/14 20:24

Description

JobTracker only needs to examine a subset of information contained by InputSplit or JobConf objects. But currently JobTracker loads the complete user-defined InputSplit and JobConf objects in memory. This design would leave JobTracker susceptible to memory exhaustion particularly in cases when some bugs in user code which could result in very large input splits or job conf objects (e.g. PIG-901).