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From "Eric Badger (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10755) TestDecommissioningStatus BindException Failure
Date Fri, 12 Aug 2016 18:20:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15419248#comment-15419248
] 

Eric Badger commented on HDFS-10755:
------------------------------------

The pre-commit test failure is unrelated to the patch. I believe the patch is ready for review.
[~kihwal], could you take a look?

> TestDecommissioningStatus BindException Failure
> -----------------------------------------------
>
>                 Key: HDFS-10755
>                 URL: https://issues.apache.org/jira/browse/HDFS-10755
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Eric Badger
>            Assignee: Eric Badger
>         Attachments: HDFS-10755.001.patch, HDFS-10755.002.patch
>
>
> Tests in TestDecomissioningStatus call MiniDFSCluster.dataNodeRestart(). They are required
to come back up on the same (initially ephemeral) port that they were on before being shutdown.
Because of this, there is an inherent race condition where another process could bind to the
port while the datanode is down. If this happens then we get a BindException failure. However,
all of the tests in TestDecommissioningStatus depend on the cluster being up and running for
them to run correctly. So if a test blows up the cluster, the subsequent tests will also fail.
Below I show the BindException failure as well as the subsequent test failure that occurred.
> {noformat}
> java.net.BindException: Problem binding to [localhost:35370] 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:436)
> 	at sun.nio.ch.Net.bind(Net.java:428)
> 	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:430)
> 	at org.apache.hadoop.ipc.Server$Listener.<init>(Server.java:768)
> 	at org.apache.hadoop.ipc.Server.<init>(Server.java:2391)
> 	at org.apache.hadoop.ipc.RPC$Server.<init>(RPC.java:951)
> 	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server.<init>(ProtobufRpcEngine.java:523)
> 	at org.apache.hadoop.ipc.ProtobufRpcEngine.getServer(ProtobufRpcEngine.java:498)
> 	at org.apache.hadoop.ipc.RPC$Builder.build(RPC.java:796)
> 	at org.apache.hadoop.hdfs.server.datanode.DataNode.initIpcServer(DataNode.java:802)
> 	at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:1134)
> 	at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:429)
> 	at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:2387)
> 	at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:2274)
> 	at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:2321)
> 	at org.apache.hadoop.hdfs.MiniDFSCluster.restartDataNode(MiniDFSCluster.java:2037)
> 	at org.apache.hadoop.hdfs.server.namenode.TestDecommissioningStatus.testDecommissionDeadDN(TestDecommissioningStatus.java:426)
> {noformat}
> {noformat}
> java.lang.AssertionError: Number of Datanodes  expected:<2> but was:<1>
> 	at org.junit.Assert.fail(Assert.java:88)
> 	at org.junit.Assert.failNotEquals(Assert.java:743)
> 	at org.junit.Assert.assertEquals(Assert.java:118)
> 	at org.junit.Assert.assertEquals(Assert.java:555)
> 	at org.apache.hadoop.hdfs.server.namenode.TestDecommissioningStatus.testDecommissionStatus(TestDecommissioningStatus.java:275)
> {noformat}
> I don't think there's any way to avoid the inherent race condition with getting the same
ephemeral port, but we can definitely fix the tests so that it doesn't cause subsequent tests
to fail. 



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