[YARN-2251] Avoid negative elapsed time in JHS/MRAM web UI and services

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.6.0
• Hadoop Flags: Reviewed
• Assignee: Zhijie Shen
• Reporter: Zhijie Shen
• Created: 25/Jun/14 05:30
• Updated: 01/Dec/14 03:09
• Resolved: 04/Jul/14 11:22

Description

Recently we observed a rare bug that an elapsed time of a reducer is going to be negative on JHS web UI and via REST APIs. While the real reason for this bug seems to be clock asynchronization on different hosts, the web frontend should have masked the negative values. However, in the current code, org.apache.hadoop.mapreduce.v2.app.webapp.dao.* only check whether the elapsed time is -1 or not.

Issue Links

• is related to: YARN-2327 YARN should warn about nodes with poor clock synchronization