[HBASE-5283] Request counters may become negative for heavily loaded regions

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.92.0
• Fix Version/s: 0.94.0
• Hadoop Flags: Reviewed
• Assignee: Mubarak Seyed
• Reporter: Ted Yu
• Created: 26/Jan/12 17:31
• Updated: 12/Oct/12 05:35
• Resolved: 21/Mar/12 17:32

Description

Requests counter showing negative count, example under 'Requests' column: -645470239

Name	Region Server	Start Key	End Key	Requests
usertable,user2037516127892189021,1326756873774.16833e4566d1daef109b8fdcd1f4b5a6. 	xxx.com:60030 	user2037516127892189021 	user2296868939942738705 	-645470239

RegionLoad.readRequestsCount and RegionLoad.writeRequestsCount are of int type. Our Ops has been running lots of heavy load operation. RegionLoad.getRequestsCount() overflows int.MAX_VALUE. It is set to D986E7E1. In table.jsp, RegionLoad.getRequestsCount() is assigned to long type. D986E7E1 is converted to long FFFFFFFFD986E7E1 which is -645470239 in decimal.

Suggested fix is to make readRequestsCount and writeRequestsCount long type.