[jira] Resolved: (HBASE-2974) LoadBalancer ArithmeticException: / by zero

["stack (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-2974?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack resolved HBASE-2974.
--------------------------

    Fix Version/s: 0.90.0
       Resolution: Fixed

Committed small fix to TRUNK

> LoadBalancer ArithmeticException: / by zero
> -------------------------------------------
>
>                 Key: HBASE-2974
>                 URL: https://issues.apache.org/jira/browse/HBASE-2974
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>            Assignee: stack
>             Fix For: 0.90.0
>
>
> Having an issue so regionservers are not checking in.  Balancer meantime went to run and threw ArithmeticException: / by zero
> Committing this:
> {code}
> Index: src/main/java/org/apache/hadoop/hbase/master/LoadBalancer.java
> ===================================================================
> --- src/main/java/org/apache/hadoop/hbase/master/LoadBalancer.java      (revision 995307)
> +++ src/main/java/org/apache/hadoop/hbase/master/LoadBalancer.java      (working copy)
> @@ -140,6 +140,10 @@
>        new TreeMap<HServerInfo,List<HRegionInfo>>(
>            new HServerInfo.LoadComparator());
>      int numServers = clusterState.size();
> +    if (numServers == 0) {
> +      LOG.debug("numServers=0 so nothing to balance");
> +      return null;
> +    }
>      int numRegions = 0;
>      // Iterate so we can count regions as we build the map
>      for(Map.Entry<HServerInfo, List<HRegionInfo>> server :
> {code}

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