[jira] [Created] (HBASE-12554) TestBaseLoadBalancer may timeout due to long hostname lookup

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

Ted Yu created HBASE-12554:
------------------------------

             Summary: TestBaseLoadBalancer may timeout due to long hostname lookup
                 Key: HBASE-12554
                 URL: https://issues.apache.org/jira/browse/HBASE-12554
             Project: HBase
          Issue Type: Test
            Reporter: Ted Yu


Here is one of the recent occurrences (https://builds.apache.org/job/PreCommit-HBASE-Build/11778/console):
{code}
testImmediateAssignment(org.apache.hadoop.hbase.master.balancer.TestBaseLoadBalancer)  Time elapsed: 30.019 sec  <<< ERROR!
java.lang.Exception: test timed out after 30000 milliseconds
	at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
	at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:901)
	at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1293)
	at java.net.InetAddress.getAllByName0(InetAddress.java:1246)
	at java.net.InetAddress.getAllByName(InetAddress.java:1162)
	at java.net.InetAddress.getAllByName(InetAddress.java:1098)
	at java.net.InetAddress.getByName(InetAddress.java:1048)
	at org.apache.hadoop.net.NetUtils.normalizeHostName(NetUtils.java:561)
	at org.apache.hadoop.net.NetUtils.normalizeHostNames(NetUtils.java:578)
	at org.apache.hadoop.net.CachedDNSToSwitchMapping.resolve(CachedDNSToSwitchMapping.java:109)
	at org.apache.hadoop.hbase.master.RackManager.getRack(RackManager.java:66)
	at org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer$Cluster.<init>(BaseLoadBalancer.java:273)
	at org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.createCluster(BaseLoadBalancer.java:1113)
	at org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.randomAssignment(BaseLoadBalancer.java:1175)
	at org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.immediateAssignment(BaseLoadBalancer.java:1145)
	at org.apache.hadoop.hbase.master.balancer.TestBaseLoadBalancer.testImmediateAssignment(TestBaseLoadBalancer.java:136)
{code}
One possible fix is to submit CachedDNSToSwitchMapping.resolve() to executor pool for execution. RackManager.getRack() can set a timeout beyond which UNKNOWN_RACK is returned.



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