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https://issues.apache.org/jira/browse/DRILL-4708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361689#comment-16361689
 ] 

Vlad Rozov commented on DRILL-4708:
-----------------------------------

[~cch...@maprtech.com]  Please retest once DRILL-5902 is fixed.

> connection closed unexpectedly
> ------------------------------
>
>                 Key: DRILL-4708
>                 URL: https://issues.apache.org/jira/browse/DRILL-4708
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - RPC
>    Affects Versions: 1.7.0
>            Reporter: Chun Chang
>            Assignee: Vlad Rozov
>            Priority: Critical
>         Attachments: data.tgz
>
>
> Running DRILL functional automation, we often see query failed randomly due 
> to the following unexpected connection close error.
> {noformat}
> Execution Failures:
> /root/drillAutomation/framework/framework/resources/Functional/ctas/ctas_flatten/100000rows/filter5.q
> Query: 
> select * from dfs.ctas_flatten.`filter5_100000rows_ctas`
> Failed with exception
> java.sql.SQLException: CONNECTION ERROR: Connection /10.10.100.171:36185 <--> 
> drillats4.qa.lab/10.10.100.174:31010 (user client) closed unexpectedly. 
> Drillbit down?
> [Error Id: 3d5dad8e-80d0-4c7f-9012-013bf01ce2b7 ]
>       at 
> org.apache.drill.jdbc.impl.DrillCursor.nextRowInternally(DrillCursor.java:247)
>       at org.apache.drill.jdbc.impl.DrillCursor.next(DrillCursor.java:321)
>       at 
> oadd.net.hydromatic.avatica.AvaticaResultSet.next(AvaticaResultSet.java:187)
>       at 
> org.apache.drill.jdbc.impl.DrillResultSetImpl.next(DrillResultSetImpl.java:172)
>       at 
> org.apache.drill.test.framework.DrillTestJdbc.executeQuery(DrillTestJdbc.java:210)
>       at 
> org.apache.drill.test.framework.DrillTestJdbc.run(DrillTestJdbc.java:99)
>       at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
>       at java.util.concurrent.FutureTask.run(FutureTask.java:262)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>       at java.lang.Thread.run(Thread.java:744)
> Caused by: oadd.org.apache.drill.common.exceptions.UserException: CONNECTION 
> ERROR: Connection /10.10.100.171:36185 <--> 
> drillats4.qa.lab/10.10.100.174:31010 (user client) closed unexpectedly. 
> Drillbit down?
> [Error Id: 3d5dad8e-80d0-4c7f-9012-013bf01ce2b7 ]
>       at 
> oadd.org.apache.drill.common.exceptions.UserException$Builder.build(UserException.java:543)
>       at 
> oadd.org.apache.drill.exec.rpc.user.QueryResultHandler$ChannelClosedHandler$1.operationComplete(QueryResultHandler.java:373)
>       at 
> oadd.io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:680)
>       at 
> oadd.io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:603)
>       at 
> oadd.io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:563)
>       at 
> oadd.io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:406)
>       at 
> oadd.io.netty.channel.DefaultChannelPromise.trySuccess(DefaultChannelPromise.java:82)
>       at 
> oadd.io.netty.channel.AbstractChannel$CloseFuture.setClosed(AbstractChannel.java:943)
>       at 
> oadd.io.netty.channel.AbstractChannel$AbstractUnsafe.doClose0(AbstractChannel.java:592)
>       at 
> oadd.io.netty.channel.AbstractChannel$AbstractUnsafe.close(AbstractChannel.java:584)
>       at 
> oadd.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.closeOnRead(AbstractNioByteChannel.java:71)
>       at 
> oadd.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.handleReadException(AbstractNioByteChannel.java:89)
>       at 
> oadd.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:162)
>       at 
> oadd.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
>       at 
> oadd.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
>       at 
> oadd.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
>       at oadd.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
>       at 
> oadd.io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
>       ... 1 more
> {noformat}



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