[YARN-2755] NM fails to clean up usercache_DEL_<timestamp> dirs after YARN-661

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 2.6.0
• Hadoop Flags: Reviewed
• Assignee: Siqi Li
• Reporter: Siqi Li
• Created: 27/Oct/14 22:36
• Updated: 01/Dec/14 03:10
• Resolved: 30/Oct/14 15:17

Description

When NM restarts frequently due to some reason, a large number of directories like these left in /data/disk$num/yarn/local/:
/data/disk1/yarn/local/usercache_DEL_1414372756105
/data/disk1/yarn/local/usercache_DEL_1413557901696
/data/disk1/yarn/local/usercache_DEL_1413657004894
/data/disk1/yarn/local/usercache_DEL_1413675321860
/data/disk1/yarn/local/usercache_DEL_1414093167936
/data/disk1/yarn/local/usercache_DEL_1413565841271
These directories are empty, but take up 100M+ due to the number of them. There were 38714 on the machine I looked at per data disk.

It appears to be a regression introduced by YARN-661

Issue Links

• relates to: YARN-661 NM fails to cleanup local directories for users