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From "Guanghao Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-16910) Avoid NPE when start StochasticLoadBalancer
Date Fri, 21 Oct 2016 08:19:58 GMT
Guanghao Zhang created HBASE-16910:
--------------------------------------

             Summary: Avoid NPE when start StochasticLoadBalancer
                 Key: HBASE-16910
                 URL: https://issues.apache.org/jira/browse/HBASE-16910
             Project: HBase
          Issue Type: Bug
          Components: Balancer
    Affects Versions: 2.0.0
            Reporter: Guanghao Zhang
            Priority: Minor


When master start, it initialize StochasticLoadBalancer.
{code}
this.balancer.setClusterStatus(getClusterStatus());
this.balancer.setMasterServices(this);
{code}

It first setClusterStatus(), then setMasterService(). But in setClusterStatus method, it use
master service which is not initialized. So it will throw NPE.
```
int tablesCount = isByTable ? services.getTableDescriptors().getAll().size() : 1;
```
It happens when set isByTable is ture.



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