[
https://issues.apache.org/jira/browse/DRILL-4338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15223741#comment-15223741
]
Khurram Faraaz commented on DRILL-4338:
---------------------------------------
I will try and get the jstack output of the drillbit processes.
Please note that queries were (concurrently) executed from a java program and
not through sqlline.
> 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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