Nicolas Liochon created HBASE-8374:
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Summary: NPE when launching the balance
Key: HBASE-8374
URL: https://issues.apache.org/jira/browse/HBASE-8374
Project: HBase
Issue Type: Bug
Components: Balancer
Affects Versions: 0.95.0
Environment: AWS / real cluster with 3 nodes + master
Reporter: Nicolas Liochon
I don't reproduce this all the time, but I had it on a fairly clean env.
It occurs every 5 minutes (i.e. the balancer period). Impact is severe: the
balancer does not run. When it starts to occurs, it occurs all the time. I
haven't tried to restart the master, but I think it should be enough.
Now, looking at the code, the NPE is strange.
{noformat}
2013-04-18 08:09:52,079 ERROR [box,60000,1366281581983-BalancerChore]
org.apache.hadoop.hbase.master.balancer.BalancerChore: Caught exception
java.lang.NullPointerException
at
org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer$Cluster.<init>(BaseLoadBalancer.java:145)
at
org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.balanceCluster(StochasticLoadBalancer.java:194)
at org.apache.hadoop.hbase.master.HMaster.balance(HMaster.java:1295)
at
org.apache.hadoop.hbase.master.balancer.BalancerChore.chore(BalancerChore.java:48)
at org.apache.hadoop.hbase.Chore.run(Chore.java:81)
at java.lang.Thread.run(Thread.java:662)
2013-04-18 08:09:52,103 DEBUG [box,60000,1366281581983-CatalogJanitor]
org.apache.hadoop.hbase.client.ClientScanner: Creating scanner over .META.
starting at key ''
{noformat}
{code}
if (regionFinder != null) {
//region location
List<ServerName> loc = regionFinder.getTopBlockLocations(region);
regionLocations[regionIndex] = new int[loc.size()];
for (int i=0; i < loc.size(); i++) {
regionLocations[regionIndex][i] = serversToIndex.get(loc.get(i));
// <========= NPE here
}
}
{code}
pinging [~enis], just in case.
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