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https://issues.apache.org/jira/browse/HBASE-18588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16126819#comment-16126819
 ] 

Guanghao Zhang commented on HBASE-18588:
----------------------------------------

OS: Ubuntu.
java version "1.8.0_131". 
Apache Maven 3.3.9.
I run "mvn clean test -Dtest=TestXX", then get a error. Is it related?
{code}
Discovery starting.
Discovery completed in 1 second, 161 milliseconds.
Run starting. Expected test count is: 79
HBaseDStreamFunctionsSuite:
Formatting using clusterid: testClusterID
*** RUN ABORTED ***
  java.io.IOException: Shutting down
  at org.apache.hadoop.hbase.MiniHBaseCluster.init(MiniHBaseCluster.java:232)
  at org.apache.hadoop.hbase.MiniHBaseCluster.<init>(MiniHBaseCluster.java:94)
  at 
org.apache.hadoop.hbase.HBaseTestingUtility.startMiniHBaseCluster(HBaseTestingUtility.java:1111)
  at 
org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:1065)
  at 
org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:936)
  at 
org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:930)
  at 
org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:859)
  at 
org.apache.hadoop.hbase.spark.HBaseDStreamFunctionsSuite.beforeAll(HBaseDStreamFunctionsSuite.scala:41)
  at 
org.scalatest.BeforeAndAfterAll$class.beforeAll(BeforeAndAfterAll.scala:187)
  at 
org.apache.hadoop.hbase.spark.HBaseDStreamFunctionsSuite.beforeAll(HBaseDStreamFunctionsSuite.scala:30)
  ...
  Cause: java.lang.RuntimeException: Failed construction of Master: class 
org.apache.hadoop.hbase.master.HMasterorg.apache.hadoop.hbase.shaded.io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.epollin()I
  at 
org.apache.hadoop.hbase.util.JVMClusterUtil.createMasterThread(JVMClusterUtil.java:145)
  at 
org.apache.hadoop.hbase.LocalHBaseCluster.addMaster(LocalHBaseCluster.java:217)
  at 
org.apache.hadoop.hbase.LocalHBaseCluster.<init>(LocalHBaseCluster.java:152)
  at org.apache.hadoop.hbase.MiniHBaseCluster.init(MiniHBaseCluster.java:214)
  at org.apache.hadoop.hbase.MiniHBaseCluster.<init>(MiniHBaseCluster.java:94)
  at 
org.apache.hadoop.hbase.HBaseTestingUtility.startMiniHBaseCluster(HBaseTestingUtility.java:1111)
  at 
org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:1065)
  at 
org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:936)
  at 
org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:930)
  at 
org.apache.hadoop.hbase.HBaseTestingUtility.startMiniCluster(HBaseTestingUtility.java:859)
  ...
  Cause: java.lang.UnsatisfiedLinkError: failed to load the required native 
library
  at 
org.apache.hadoop.hbase.shaded.io.netty.channel.epoll.Epoll.ensureAvailability(Epoll.java:78)
  at 
org.apache.hadoop.hbase.shaded.io.netty.channel.epoll.EpollEventLoopGroup.<clinit>(EpollEventLoopGroup.java:38)
  at 
org.apache.hadoop.hbase.util.NettyEventLoopGroupConfig.<init>(NettyEventLoopGroupConfig.java:61)
  at 
org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:553)
  at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:469)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  at 
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
  at 
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
  at 
org.apache.hadoop.hbase.util.JVMClusterUtil.createMasterThread(JVMClusterUtil.java:140)
  ...
  Cause: java.lang.UnsatisfiedLinkError: 
org.apache.hadoop.hbase.shaded.io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.epollin()I
  at 
org.apache.hadoop.hbase.shaded.io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.epollin(Native
 Method)
  at 
org.apache.hadoop.hbase.shaded.io.netty.channel.epoll.Native.<clinit>(Native.java:66)
  at 
org.apache.hadoop.hbase.shaded.io.netty.channel.epoll.Epoll.<clinit>(Epoll.java:33)
  at 
org.apache.hadoop.hbase.shaded.io.netty.channel.epoll.EpollEventLoopGroup.<clinit>(EpollEventLoopGroup.java:38)
  at 
org.apache.hadoop.hbase.util.NettyEventLoopGroupConfig.<init>(NettyEventLoopGroupConfig.java:61)
  at 
org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:553)
  at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:469)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  at 
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
  at 
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  ...
{code}

> Verify we're using netty .so epolling on linux post HBASE-18271
> ---------------------------------------------------------------
>
>                 Key: HBASE-18588
>                 URL: https://issues.apache.org/jira/browse/HBASE-18588
>             Project: HBase
>          Issue Type: Task
>          Components: test
>    Affects Versions: 2.0.0
>            Reporter: stack
>            Assignee: stack
>             Fix For: 2.0.0
>
>
> This is a task to verify that indeed we are using .so native epoll on linux. 
> This task is probably unnecessary since we'd fail on the linux build box if 
> this was not in place but verify that our relocation is indeed finding the 
> native code. Assigned myself.



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