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https://issues.apache.org/jira/browse/HDFS-9444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15028559#comment-15028559
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Steve Loughran commented on HDFS-9444:
--------------------------------------
FWIW, the technique I use for finding > 1 free port is to allocate all the
server sockets before releasing any of them, in the scala code
[FreePortFinder|https://github.com/steveloughran/spark/blob/stevel/feature/SPARK-1537-ATS/yarn/src/history/test/scala/org/apache/spark/deploy/history/yarn/testtools/FreePortFinder.scala].
A version in Hadoop would address this problem
> TestEditLogTailer#testNN1TriggersLogRolls fails bind exception.
> ---------------------------------------------------------------
>
> Key: HDFS-9444
> URL: https://issues.apache.org/jira/browse/HDFS-9444
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Brahma Reddy Battula
> Attachments: HDFS-9444.001.patch
>
>
> https://builds.apache.org/job/Hadoop-Hdfs-trunk/2556/testReport/
> {noformat}
> java.net.BindException: Problem binding to [localhost:42477]
> java.net.BindException: Address already in use; For more details see:
> http://wiki.apache.org/hadoop/BindException
> at sun.nio.ch.Net.bind0(Native Method)
> at sun.nio.ch.Net.bind(Net.java:444)
> at sun.nio.ch.Net.bind(Net.java:436)
> at
> sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)
> at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
> at org.apache.hadoop.ipc.Server.bind(Server.java:469)
> at org.apache.hadoop.ipc.Server$Listener.<init>(Server.java:695)
> at org.apache.hadoop.ipc.Server.<init>(Server.java:2464)
> at org.apache.hadoop.ipc.RPC$Server.<init>(RPC.java:945)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server.<init>(ProtobufRpcEngine.java:535)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine.getServer(ProtobufRpcEngine.java:510)
> at org.apache.hadoop.ipc.RPC$Builder.build(RPC.java:787)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.<init>(NameNodeRpcServer.java:390)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createRpcServer(NameNode.java:742)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:680)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:883)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:862)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1564)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.createNameNode(MiniDFSCluster.java:1247)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.configureNameService(MiniDFSCluster.java:1016)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.createNameNodesAndSetConf(MiniDFSCluster.java:891)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.initMiniDFSCluster(MiniDFSCluster.java:823)
> at org.apache.hadoop.hdfs.MiniDFSCluster.<init>(MiniDFSCluster.java:482)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster$Builder.build(MiniDFSCluster.java:441)
> at
> org.apache.hadoop.hdfs.server.namenode.ha.TestEditLogTailer.testStandbyTriggersLogRolls(TestEditLogTailer.java:139)
> at
> org.apache.hadoop.hdfs.server.namenode.ha.TestEditLogTailer.testNN1TriggersLogRolls(TestEditLogTailer.java:114)
> {noformat}
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