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From "Daniel Barclay (Drill) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-1735) JDBC driver's close() leaks resources in local mode
Date Mon, 02 Mar 2015 22:25:04 GMT

     [ https://issues.apache.org/jira/browse/DRILL-1735?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Barclay (Drill) updated DRILL-1735:
------------------------------------------
    Attachment: DRILL-1735.13-core.patch.txt

Core 1735 changes (not FragmentExecutor, etc., comments and adjustments).

> JDBC driver's close() leaks resources in local mode
> ---------------------------------------------------
>
>                 Key: DRILL-1735
>                 URL: https://issues.apache.org/jira/browse/DRILL-1735
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Client - JDBC
>            Reporter: Daniel Barclay (Drill)
>            Assignee: Daniel Barclay (Drill)
>            Priority: Critical
>             Fix For: 0.8.0
>
>         Attachments: Bug1735CloseDoesntCloseTest.java, DRILL-1735.10.patch.txt, DRILL-1735.11.patch.txt,
DRILL-1735.12.patch.txt, DRILL-1735.13-core.patch.txt, DRILL-1735.6.patch.txt, DRILL-1735.9.patch.txt
>
>
> When the Drill JDBC driver is used in local mode (as  DriverManager.getConnection("jdbc:drill:zk=local",
... ), the close() method doesn't free resources:  Calling getConnection() and then close()
and then repeating that pair of calls enough times results in an exception, the root cause
exeception of which is an IOException saying "Too many open files":
> java.sql.SQLException: Failure while attempting to start Drillbit in embedded mode.
> 	at org.apache.drill.jdbc.DrillConnectionImpl.<init>(DrillConnectionImpl.java:81)
> 	at org.apache.drill.jdbc.DrillJdbc41Factory$DrillJdbc41Connection.<init>(DrillJdbc41Factory.java:88)
> 	at org.apache.drill.jdbc.DrillJdbc41Factory.newDrillConnection(DrillJdbc41Factory.java:57)
> 	at org.apache.drill.jdbc.DrillJdbc41Factory.newDrillConnection(DrillJdbc41Factory.java:1)
> 	at org.apache.drill.jdbc.DrillFactory.newConnection(DrillFactory.java:51)
> 	at net.hydromatic.avatica.UnregisteredDriver.connect(UnregisteredDriver.java:126)
> 	at java.sql.DriverManager.getConnection(DriverManager.java:571)
> 	at java.sql.DriverManager.getConnection(DriverManager.java:187)
> 	at temp.Bug1735CloseDoesntCloseTest.testBug(Bug1735CloseDoesntCloseTest.java:26)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at java.lang.reflect.Method.invoke(Method.java:606)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at java.lang.reflect.Method.invoke(Method.java:606)
> 	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
> 	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
> 	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
> 	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
> 	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
> 	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
> Caused by: java.lang.IllegalStateException: failed to create a child event loop
> 	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:68)
> 	at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
> 	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
> 	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
> 	at org.apache.drill.exec.rpc.TransportCheck.createEventLoopGroup(TransportCheck.java:75)
> 	at org.apache.drill.exec.server.BootStrapContext.<init>(BootStrapContext.java:45)
> 	at org.apache.drill.exec.server.Drillbit.<init>(Drillbit.java:95)
> 	at org.apache.drill.jdbc.DrillConnectionImpl.<init>(DrillConnectionImpl.java:78)
> 	... 18 more
> Caused by: io.netty.channel.ChannelException: failed to open a new selector
> 	at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128)
> 	at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120)
> 	at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87)
> 	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:64)
> 	... 25 more
> Caused by: java.io.IOException: Too many open files
> 	at sun.nio.ch.IOUtil.makePipe(Native Method)
> 	at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126)
> 	... 28 more



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