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From "Khurram Faraaz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4338) Concurrent query remains in CANCELLATION_REQUESTED state
Date Tue, 05 Apr 2016 04:03:25 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15225648#comment-15225648
] 

Khurram Faraaz commented on DRILL-4338:
---------------------------------------

It is very easy to reproduce the problem on MapR Drill 1.6.0 RPM. Please run the test java
program attached in this JIRA. I can point you to the JSON data file that was used in the
test. That way you can look at jstack output at your end. For some reason on my node jstack
does not provide the required stack information. 

> Concurrent query remains in CANCELLATION_REQUESTED state 
> ---------------------------------------------------------
>
>                 Key: DRILL-4338
>                 URL: https://issues.apache.org/jira/browse/DRILL-4338
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Flow
>    Affects Versions: 1.4.0
>         Environment: 4 node cluster CentOS
>            Reporter: Khurram Faraaz
>         Attachments: ConcurrencyTest.java, query_In_cancellation_requested_state.png
>
>
> Execute a query concurrently through a Java program and while the java program is under
execution (executing SQL queries concurrently) issue Ctrl-C on the prompt where the java program
was being executed.
> Here are two observations, 
> (1) There is an Exception in drillbit.log.
> (2) Once Ctrl-C was issued to the java program, queries that were under execution at
that point of time, move from FAILED state to CANCELLATION_REQUESTED state, they do not end
up in CANCELED state. Ideally that last state of these queries should be CANCELED state and
not CANCELLATION_REQUESTED. 
> Snippet from drillbit.log
> {noformat}
> 2016-02-02 06:21:21,903 [294fb51d-8a4c-c099-dc90-97434056e3d7:frag:0:0] INFO  o.a.d.e.w.fragment.FragmentExecutor
- 294fb51d-8a4c-c099-dc90-97434056e3d7:0:0: State change requested AWAITING_ALLOCATION -->
RUNNING
> 2016-02-02 06:21:21,903 [294fb51d-8a4c-c099-dc90-97434056e3d7:frag:0:0] INFO  o.a.d.e.w.f.FragmentStatusReporter
- 294fb51d-8a4c-c099-dc90-97434056e3d7:0:0: State to report: RUNNING
> 2016-02-02 06:21:48,560 [UserServer-1] ERROR o.a.d.exec.rpc.RpcExceptionHandler - Exception
in RPC communication.  Connection: /10.10.100.201:31010 <--> /10.10.100.201:45087 (user
client).  Closing connection.
> java.io.IOException: syscall:read(...)() failed: Connection reset by peer
> 2016-02-02 06:21:48,562 [UserServer-1] INFO  o.a.d.e.w.fragment.FragmentExecutor - 294fb51d-8a4c-c099-dc90-97434056e3d7:0:0:
State change requested RUNNING --> FAILED
> 2016-02-02 06:21:48,562 [UserServer-1] INFO  o.a.d.e.w.fragment.FragmentExecutor - 294fb51d-f424-6adc-d668-1659e4353698:0:0:
State change requested RUNNING --> FAILED
> 2016-02-02 06:21:48,562 [UserServer-1] INFO  o.a.d.e.w.fragment.FragmentExecutor - 294fb51d-c7f6-2c8f-0689-af9de21a6d20:0:0:
State change requested RUNNING --> FAILED
> 2016-02-02 06:21:48,563 [UserServer-1] INFO  o.a.d.e.w.fragment.FragmentExecutor - 294fb51e-5de9-0919-be56-52f75a0532f1:0:0:
State change requested RUNNING --> FAILED
> 2016-02-02 06:21:48,573 [CONTROL-rpc-event-queue] INFO  o.a.d.e.w.fragment.FragmentExecutor
- 294fb51d-f424-6adc-d668-1659e4353698:0:0: State change requested FAILED --> CANCELLATION_REQUESTED
> 2016-02-02 06:21:48,573 [CONTROL-rpc-event-queue] WARN  o.a.d.e.w.fragment.FragmentExecutor
- 294fb51d-f424-6adc-d668-1659e4353698:0:0: Ignoring unexpected state transition FAILED -->
CANCELLATION_REQUESTED
> 2016-02-02 06:21:48,580 [CONTROL-rpc-event-queue] INFO  o.a.d.e.w.fragment.FragmentExecutor
- 294fb51e-5de9-0919-be56-52f75a0532f1:0:0: State change requested FAILED --> CANCELLATION_REQUESTED
> 2016-02-02 06:21:48,580 [CONTROL-rpc-event-queue] WARN  o.a.d.e.w.fragment.FragmentExecutor
- 294fb51e-5de9-0919-be56-52f75a0532f1:0:0: Ignoring unexpected state transition FAILED -->
CANCELLATION_REQUESTED
> 2016-02-02 06:21:48,588 [CONTROL-rpc-event-queue] INFO  o.a.d.e.w.fragment.FragmentExecutor
- 294fb51d-c7f6-2c8f-0689-af9de21a6d20:0:0: State change requested FAILED --> CANCELLATION_REQUESTED
> 2016-02-02 06:21:48,588 [CONTROL-rpc-event-queue] WARN  o.a.d.e.w.fragment.FragmentExecutor
- 294fb51d-c7f6-2c8f-0689-af9de21a6d20:0:0: Ignoring unexpected state transition FAILED -->
CANCELLATION_REQUESTED
> 2016-02-02 06:21:48,596 [CONTROL-rpc-event-queue] INFO  o.a.d.e.w.fragment.FragmentExecutor
- 294fb51d-8a4c-c099-dc90-97434056e3d7:0:0: State change requested FAILED --> CANCELLATION_REQUESTED
> 2016-02-02 06:21:48,596 [CONTROL-rpc-event-queue] WARN  o.a.d.e.w.fragment.FragmentExecutor
- 294fb51d-8a4c-c099-dc90-97434056e3d7:0:0: Ignoring unexpected state transition FAILED -->
CANCELLATION_REQUESTED
> 2016-02-02 06:21:48,597 [UserServer-1] INFO  o.a.d.e.w.fragment.FragmentExecutor - 294fb51d-f424-6adc-d668-1659e4353698:0:0:
State change requested FAILED --> FAILED
> 2016-02-02 06:21:48,599 [UserServer-1] WARN  o.a.d.exec.rpc.RpcExceptionHandler - Exception
occurred with closed channel.  Connection: /10.10.100.201:31010 <--> /10.10.100.201:45087
(user client)
> io.netty.handler.codec.EncoderException: RpcEncoder must produce at least one message.
> at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:98)
~[netty-codec-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:705)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:32)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:980)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1032)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:965)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:357)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:254) [netty-transport-native-epoll-4.0.27.Final-linux-x86_64.jar:na]
>         at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65]
> 2016-02-02 06:21:48,600 [UserServer-1] INFO  o.a.d.e.w.fragment.FragmentExecutor - 294fb51e-5de9-0919-be56-52f75a0532f1:0:0:
State change requested FAILED --> FAILED
> 2016-02-02 06:21:48,600 [UserServer-1] WARN  o.a.d.exec.rpc.RpcExceptionHandler - Exception
occurred with closed channel.  Connection: /10.10.100.201:31010 <--> /10.10.100.201:45087
(user client)
> io.netty.handler.codec.EncoderException: RpcEncoder must produce at least one message.
>         at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:98)
~[netty-codec-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:705)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:32)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:980)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1032)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:965)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:357)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:254) [netty-transport-native-epoll-4.0.27.Final-linux-x86_64.jar:na]
>         at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65]
> 2016-02-02 06:21:48,601 [UserServer-1] INFO  o.a.d.e.w.fragment.FragmentExecutor - 294fb51d-c7f6-2c8f-0689-af9de21a6d20:0:0:
State change requested FAILED --> FAILED
> 2016-02-02 06:21:48,601 [UserServer-1] WARN  o.a.d.exec.rpc.RpcExceptionHandler - Exception
occurred with closed channel.  Connection: /10.10.100.201:31010 <--> /10.10.100.201:45087
(user client)
> io.netty.handler.codec.EncoderException: RpcEncoder must produce at least one message.
>         at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:98)
~[netty-codec-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:705)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:32)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:980)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1032)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:965)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:357)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:254) [netty-transport-native-epoll-4.0.27.Final-linux-x86_64.jar:na]
>         at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65]
> 2016-02-02 06:21:48,601 [UserServer-1] INFO  o.a.d.e.w.fragment.FragmentExecutor - 294fb51d-8a4c-c099-dc90-97434056e3d7:0:0:
State change requested FAILED --> FAILED
> 2016-02-02 06:21:48,601 [UserServer-1] WARN  o.a.d.exec.rpc.RpcExceptionHandler - Exception
occurred with closed channel.  Connection: /10.10.100.201:31010 <--> /10.10.100.201:45087
(user client)
> io.netty.handler.codec.EncoderException: RpcEncoder must produce at least one message.
>         at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:98)
~[netty-codec-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:705)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:32)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:980)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1032)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:965)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:357)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:254) [netty-transport-native-epoll-4.0.27.Final-linux-x86_64.jar:na]
>         at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65]
> 2016-02-02 06:21:48,602 [UserServer-1] INFO  o.a.d.e.w.fragment.FragmentExecutor - 294fb51d-f424-6adc-d668-1659e4353698:0:0:
State change requested FAILED --> FAILED
> 2016-02-02 06:21:48,602 [UserServer-1] WARN  o.a.d.exec.rpc.RpcExceptionHandler - Exception
occurred with closed channel.  Connection: /10.10.100.201:31010 <--> /10.10.100.201:45087
(user client)
> io.netty.handler.codec.EncoderException: RpcEncoder must produce at least one message.
>         at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:98)
~[netty-codec-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:705)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:32)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:980)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1032)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:965)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:357)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:254) [netty-transport-native-epoll-4.0.27.Final-linux-x86_64.jar:na]
>         at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65]
> 2016-02-02 06:21:48,602 [UserServer-1] INFO  o.a.d.e.w.fragment.FragmentExecutor - 294fb51e-5de9-0919-be56-52f75a0532f1:0:0:
State change requested FAILED --> FAILED
> 2016-02-02 06:21:48,603 [UserServer-1] WARN  o.a.d.exec.rpc.RpcExceptionHandler - Exception
occurred with closed channel.  Connection: /10.10.100.201:31010 <--> /10.10.100.201:45087
(user client)
> io.netty.handler.codec.EncoderException: RpcEncoder must produce at least one message.
>         at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:98)
~[netty-codec-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:705)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:32)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:980)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1032)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:965)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:357)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:254) [netty-transport-native-epoll-4.0.27.Final-linux-x86_64.jar:na]
>         at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65]
> 2016-02-02 06:21:48,603 [UserServer-1] INFO  o.a.d.e.w.fragment.FragmentExecutor - 294fb51d-c7f6-2c8f-0689-af9de21a6d20:0:0:
State change requested FAILED --> FAILED
> 2016-02-02 06:21:48,603 [UserServer-1] WARN  o.a.d.exec.rpc.RpcExceptionHandler - Exception
occurred with closed channel.  Connection: /10.10.100.201:31010 <--> /10.10.100.201:45087
(user client)
> io.netty.handler.codec.EncoderException: RpcEncoder must produce at least one message.
>         at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:98)
~[netty-codec-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:705)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:32)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:980)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1032)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:965)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:357)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:254) [netty-transport-native-epoll-4.0.27.Final-linux-x86_64.jar:na]
>         at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65]
> 2016-02-02 06:21:48,603 [UserServer-1] INFO  o.a.d.e.w.fragment.FragmentExecutor - 294fb51d-8a4c-c099-dc90-97434056e3d7:0:0:
State change requested FAILED --> FAILED
> 2016-02-02 06:21:48,604 [UserServer-1] WARN  o.a.d.exec.rpc.RpcExceptionHandler - Exception
occurred with closed channel.  Connection: /10.10.100.201:31010 <--> /10.10.100.201:45087
(user client)
> io.netty.handler.codec.EncoderException: RpcEncoder must produce at least one message.
>         at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:98)
~[netty-codec-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:705)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:32)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:980)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1032)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:965)
[netty-transport-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:357)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:254) [netty-transport-native-epoll-4.0.27.Final-linux-x86_64.jar:na]
>         at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
[netty-common-4.0.27.Final.jar:4.0.27.Final]
>         at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65]
> {noformat}



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