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
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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