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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15207) Stuck balancer; logging ten lines a millisecond
Date Tue, 02 Feb 2016 19:37:39 GMT
stack created HBASE-15207:
-----------------------------

             Summary: Stuck balancer; logging ten lines a millisecond
                 Key: HBASE-15207
                 URL: https://issues.apache.org/jira/browse/HBASE-15207
             Project: HBase
          Issue Type: Bug
          Components: Balancer
    Affects Versions: 1.2.0
            Reporter: stack


Last night my logs filled with this (10x256MB log files):

....
2016-02-01 11:25:26,958 DEBUG [B.defaultRpcServer.handler=9,queue=0,port=16000] balancer.BaseLoadBalancer:
Lowest locality region server with non zero regions is ve0542.halxg.cloudera.com with locality
0.0
2016-02-01 11:25:26,958 DEBUG [B.defaultRpcServer.handler=9,queue=0,port=16000] balancer.BaseLoadBalancer:
 Lowest locality region index is 0 and its region server contains 1 regions
...


Added by this:

commit 54028140f4f19a6af81c8c8f29dda0c52491a0c9
Author: tedyu <yuzhihong@gmail.com>
Date:   Thu Aug 13 09:11:59 2015 -0700

    HBASE-13376 Improvements to Stochastic load balancer (Vandana Ayyalasomayajula)

Looks like balancer got stuck. Logging at ten lines a millisecond.

Here is lead up. Nothing in particular jumps out. Rerun doesn't show this.

{code}
2016-01-28 05:56:22,572 DEBUG [ve0524.halxg.cloudera.com,16000,1453988766013_ChoreService_1]
balancer.BaseLoadBalancer: Server ve0526.halxg.cloudera.com had 0 regions.
2016-01-28 05:56:22,572 DEBUG [ve0524.halxg.cloudera.com,16000,1453988766013_ChoreService_1]
balancer.BaseLoadBalancer: Server ve0532.halxg.cloudera.com had 0 regions.
2016-01-28 05:56:22,572 DEBUG [ve0524.halxg.cloudera.com,16000,1453988766013_ChoreService_1]
balancer.BaseLoadBalancer: Server ve0538.halxg.cloudera.com had 0 regions.
2016-01-28 05:56:22,572 DEBUG [ve0524.halxg.cloudera.com,16000,1453988766013_ChoreService_1]
balancer.BaseLoadBalancer: Lowest locality region server with non zero regions is ve0540.halxg.cloudera.com
with locality 0.0
2016-01-28 05:56:22,572 DEBUG [ve0524.halxg.cloudera.com,16000,1453988766013_ChoreService_1]
balancer.BaseLoadBalancer:  Lowest locality region index is 0 and its region server contains
1 regions
2016-01-28 05:56:22,573 DEBUG [ve0524.halxg.cloudera.com,16000,1453988766013_ChoreService_1]
balancer.BaseLoadBalancer: Server ve0526.halxg.cloudera.com had 0 regions.
2016-01-28 05:56:22,573 DEBUG [ve0524.halxg.cloudera.com,16000,1453988766013_ChoreService_1]
balancer.BaseLoadBalancer: Server ve0532.halxg.cloudera.com had 0 regions.
2016-01-28 05:56:22,573 DEBUG [ve0524.halxg.cloudera.com,16000,1453988766013_ChoreService_1]
balancer.BaseLoadBalancer: Server ve0538.halxg.cloudera.com had 0 regions.
2016-01-28 05:56:22,573 DEBUG [ve0524.halxg.cloudera.com,16000,1453988766013_ChoreService_1]
balancer.BaseLoadBalancer: Lowest locality region server with non zero regions is ve0540.halxg.cloudera.com
with locality 0.0
2016-01-28 05:56:22,573 DEBUG [ve0524.halxg.cloudera.com,16000,1453988766013_ChoreService_1]
balancer.BaseLoadBalancer:  Lowest locality region index is 0 and its region server contains
1 regions
2016-01-28 05:56:22,573 DEBUG [ve0524.halxg.cloudera.com,16000,1453988766013_ChoreService_1]
balancer.BaseLoadBalancer: Server ve0526.halxg.cloudera.com had 0 regions.
2016-01-28 05:56:22,573 DEBUG [ve0524.halxg.cloudera.com,16000,1453988766013_ChoreService_1]
balancer.BaseLoadBalancer: Server ve0532.halxg.cloudera.com had 0 regions.
2016-01-28 05:56:22,573 DEBUG [ve0524.halxg.cloudera.com,16000,1453988766013_ChoreService_1]
balancer.BaseLoadBalancer: Server ve0538.halxg.cloudera.com had 0 regions.
....
{code}

Nothing else is happening on this master

Happens just after a Master joins cluster after being killed by a monkey.



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