[HBASE-15210] Undo aggressive load balancer logging at tens of lines per millisecond

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.2.0
• Fix Version/s: 1.2.0, 1.3.0, 2.0.0
• Component/s: Balancer
• Hadoop Flags: Reviewed
• Assignee: Michael Stack
• Reporter: Michael Stack
• Created: 03/Feb/16 07:14
• Updated: 05/Feb/16 06:53
• Resolved: 04/Feb/16 22:25

Description

Sometimes the load balancer falls into a state of aggressive logging in 1.2.0 writing out ten lines a millisecond like this:

2016-02-02 17:15:01,382 DEBUG [ve0524.halxg.cloudera.com,16000,1454461776827_ChoreService_1] balancer.BaseLoadBalancer: Lowest locality region server with non zero regions is ve0540.halxg.cloudera.com with locality 0.22908874
2016-02-02 17:15:01,382 DEBUG [ve0524.halxg.cloudera.com,16000,1454461776827_ChoreService_1] balancer.BaseLoadBalancer:  Lowest locality region index is 3 and its region server contains 4 regions
2016-02-02 17:15:01,384 DEBUG [ve0524.halxg.cloudera.com,16000,1454461776827_ChoreService_1] balancer.BaseLoadBalancer: Lowest locality region server with non zero regions is ve0540.halxg.cloudera.com with locality 0.22908874
2016-02-02 17:15:01,384 DEBUG [ve0524.halxg.cloudera.com,16000,1454461776827_ChoreService_1] balancer.BaseLoadBalancer:  Lowest locality region index is 3 and its region server contains 4 regions
2016-02-02 17:15:01,386 DEBUG [ve0524.halxg.cloudera.com,16000,1454461776827_ChoreService_1] balancer.BaseLoadBalancer: Lowest locality region server with non zero regions is ve0540.halxg.cloudera.com with locality 0.22908874
2016-02-02 17:15:01,386 DEBUG [ve0524.halxg.cloudera.com,16000,1454461776827_ChoreService_1] balancer.BaseLoadBalancer:  Lowest locality region index is 2 and its region server contains 4 regions
2016-02-02 17:15:01,387 DEBUG [ve0524.halxg.cloudera.com,16000,1454461776827_ChoreService_1] balancer.BaseLoadBalancer: Lowest locality region server with non zero regions is ve0540.halxg.cloudera.com with locality 0.22908874
2016-02-02 17:15:01,387 DEBUG [ve0524.halxg.cloudera.com,16000,1454461776827_ChoreService_1] balancer.BaseLoadBalancer:  Lowest locality region index is 3 and its region server contains 4 regions
2016-02-02 17:15:01,388 DEBUG [ve0524.halxg.cloudera.com,16000,1454461776827_ChoreService_1] balancer.BaseLoadBalancer: Lowest locality region server with non zero regions is ve0540.halxg.cloudera.com with locality 0.22908874
2016-02-02 17:15:01,388 DEBUG [ve0524.halxg.cloudera.com,16000,1454461776827_ChoreService_1] balancer.BaseLoadBalancer:  Lowest locality region index is 3 and its region server contains 4 regions
2016-02-02 17:15:01,388 DEBUG [ve0524.halxg.cloudera.com,16000,1454461776827_ChoreService_1] balancer.BaseLoadBalancer: Lowest locality region server with non zero regions is ve0540.halxg.cloudera.com with locality 0.22908874

This issue is about less logging.

This log was added recently by this:

commit 54028140f4f19a6af81c8c8f29dda0c52491a0c9
Author: tedyu <[e-mail]>
Date: Thu Aug 13 09:11:59 2015 -0700
HBASE-13376 Improvements to Stochastic load balancer (Vandana Ayyalasomayajula)