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https://issues.apache.org/jira/browse/BOOKKEEPER-783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14134365#comment-14134365
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Sijie Guo commented on BOOKKEEPER-783:
--------------------------------------
[~fpj] the test was to test multiple read/write threads in bookie server side.
we don't actually need multiple clients to spawn multiple connections, since in
bookie server side, individual read requests would be submitted to different
read threads.
> Avoid running out of fds in MutlipleThreadReadTest
> --------------------------------------------------
>
> Key: BOOKKEEPER-783
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-783
> Project: Bookkeeper
> Issue Type: Bug
> Components: bookkeeper-server
> Reporter: Sijie Guo
> Assignee: Sijie Guo
> Labels: test
> Fix For: 4.3.0
>
> Attachments: BOOKKEEPER-783.patch
>
>
> {code}
> org.jboss.netty.channel.ChannelException: Failed to create a selector.
> at
> org.jboss.netty.channel.socket.nio.AbstractNioSelector.openSelector(AbstractNioSelector.java:343)
> at
> org.jboss.netty.channel.socket.nio.AbstractNioSelector.<init>(AbstractNioSelector.java:100)
> at
> org.jboss.netty.channel.socket.nio.AbstractNioWorker.<init>(AbstractNioWorker.java:52)
> at
> org.jboss.netty.channel.socket.nio.NioWorker.<init>(NioWorker.java:45)
> at
> org.jboss.netty.channel.socket.nio.NioWorkerPool.createWorker(NioWorkerPool.java:45)
> at
> org.jboss.netty.channel.socket.nio.NioWorkerPool.createWorker(NioWorkerPool.java:28)
> at
> org.jboss.netty.channel.socket.nio.AbstractNioWorkerPool.newWorker(AbstractNioWorkerPool.java:143)
> at
> org.jboss.netty.channel.socket.nio.AbstractNioWorkerPool.init(AbstractNioWorkerPool.java:81)
> at
> org.jboss.netty.channel.socket.nio.NioWorkerPool.<init>(NioWorkerPool.java:39)
> at
> org.jboss.netty.channel.socket.nio.NioWorkerPool.<init>(NioWorkerPool.java:33)
> at
> org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory.<init>(NioClientSocketChannelFactory.java:151)
> at
> org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory.<init>(NioClientSocketChannelFactory.java:116)
> at org.apache.bookkeeper.client.BookKeeper.<init>(BookKeeper.java:204)
> at
> org.apache.bookkeeper.client.BookKeeperTestClient.<init>(BookKeeperTestClient.java:50)
> at
> org.apache.bookkeeper.test.MultipleThreadReadTest.createClients(MultipleThreadReadTest.java:73)
> at
> org.apache.bookkeeper.test.MultipleThreadReadTest.multiLedgerMultiThreadRead(MultipleThreadReadTest.java:282)
> at
> org.apache.bookkeeper.test.MultipleThreadReadTest.test1Ledger50ThreadsRead(MultipleThreadReadTest.java:326)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
> at
> org.junit.internal.runners.statements.FailOnTimeout$1.run(FailOnTimeout.java:28)
> Caused by: java.io.IOException: Too many open files
> at sun.nio.ch.EPollArrayWrapper.epollCreate(Native Method)
> at sun.nio.ch.EPollArrayWrapper.<init>(EPollArrayWrapper.java:69)
> at sun.nio.ch.EPollSelectorImpl.<init>(EPollSelectorImpl.java:52)
> at
> sun.nio.ch.EPollSelectorProvider.openSelector(EPollSelectorProvider.java:18)
> at java.nio.channels.Selector.open(Selector.java:209)
> at
> org.jboss.netty.channel.socket.nio.SelectorUtil.open(SelectorUtil.java:63)
> at
> org.jboss.netty.channel.socket.nio.AbstractNioSelector.openSelector(AbstractNioSelector.java:341)
> {code}
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