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https://issues.apache.org/jira/browse/HBASE-15835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15285524#comment-15285524
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Sean Busbey commented on HBASE-15835:
-------------------------------------
you should be able to assign to yourself now.
> HBaseTestingUtility#startMiniCluster throws "HMasterAddress already in use"
> RuntimeException when a local instance of HBase is running
> --------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-15835
> URL: https://issues.apache.org/jira/browse/HBASE-15835
> Project: HBase
> Issue Type: Bug
> Components: API
> Affects Versions: 2.0.0
> Reporter: Daniel Vimont
> Labels: easyfix
> Fix For: 2.0.0
>
>
> When a MiniCluster is being started with the
> {{HBaseTestUtility#startMiniCluster}} method (most typically in the context
> of JUnit testing), if a local HBase instance is already running (or for that
> matter, another thread with another MiniCluster is already running), the
> startup will fail with a RuntimeException saying "HMasterAddress already in
> use", referring explicitly to contention for the same default master info
> port (16010).
> This problem most recently came up in conjunction with HBASE-14876 and its
> sub-JIRAs (development of new HBase-oriented Maven archetypes), but this is
> apparently a known issue to veteran developers, who tend to set up the
> @BeforeClass sections of their test modules with code similar to the
> following:
> {code}
> UTIL = HBaseTestingUtility.createLocalHTU();
> // disable UI's on test cluster.
> UTIL.getConfiguration().setInt("hbase.master.info.port", -1);
> UTIL.getConfiguration().setInt("hbase.regionserver.info.port", -1);
> UTIL.startMiniCluster();
> {code}
> A comprehensive solution modeled on this should be put directly into
> HBaseTestUtility's main constructor, using one of the following options:
> OPTION 1 (always force random port assignment):
> {code}
> this.getConfiguration().setInt(HConstants.MASTER_INFO_PORT, -1);
> this.getConfiguration().setInt(HConstants.REGIONSERVER_PORT, -1);
> {code}
> OPTION 2 (always force random port assignment if user has not explicitly
> defined alternate port):
> {code}
> Configuration conf = this.getConfiguration();
> if (conf.getInt(HConstants.MASTER_INFO_PORT,
> HConstants.DEFAULT_MASTER_INFOPORT)
> == HConstants.DEFAULT_MASTER_INFOPORT) {
> conf.setInt(HConstants.MASTER_INFO_PORT, -1);
> }
> if (conf.getInt(HConstants.REGIONSERVER_PORT,
> HConstants.DEFAULT_REGIONSERVER_PORT)
> == HConstants.DEFAULT_REGIONSERVER_PORT) {
> conf.setInt(HConstants.REGIONSERVER_PORT, -1);
> }
> {code}
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