[HBASE-14293] TestStochasticBalancerJmxMetrics intermittently fails due to port conflict

• Type: Test
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.3.0, 2.0.0
• Hadoop Flags: Reviewed
• Assignee: Ted Yu
• Reporter: Ted Yu
• Created: 22/Aug/15 21:22
• Updated: 01/Jul/22 21:07
• Resolved: 24/Aug/15 13:21

Description

From https://builds.apache.org/job/HBase-TRUNK/6748/testReport/junit/org.apache.hadoop.hbase/TestStochasticBalancerJmxMetrics/testJmxMetrics_EnsembleMode/ :

2015-08-22 20:46:07,939 ERROR [M:0;asf900:59022] coprocessor.CoprocessorHost(518): The coprocessor org.apache.hadoop.hbase.JMXListener threw java.rmi.server.ExportException: Port already in use: 61120; nested exception is: 
	java.net.BindException: Address already in use
java.rmi.server.ExportException: Port already in use: 61120; nested exception is: 
	java.net.BindException: Address already in use
	at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:329)
	at sun.rmi.transport.tcp.TCPTransport.exportObject(TCPTransport.java:237)
	at sun.rmi.transport.tcp.TCPEndpoint.exportObject(TCPEndpoint.java:411)
...
2015-08-22 20:49:41,755 DEBUG [main] hbase.TestStochasticBalancerJmxMetrics(93): Encountered exception when starting cluster. Trying port 61122
java.lang.IllegalStateException: A mini-cluster is already running
	at org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:981)
	at org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:872)
	at org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:866)
	at org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:810)
	at org.apache.hadoop.hbase.TestStochasticBalancerJmxMetrics.setupBeforeClass(TestStochasticBalancerJmxMetrics.java:89)

When port conflict is detected, we try the next port.
However, HTU#miniClusterRunning is true by this moment, leading to the second exception shown above.