Eric Badger created HDFS-10755:
----------------------------------

             Summary: 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


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. 



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-dev-unsubscr...@hadoop.apache.org
For additional commands, e-mail: hdfs-dev-h...@hadoop.apache.org

Reply via email to