[
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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