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From "Sudheesh Katkam (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4338) Concurrent query remains in CANCELLATION_REQUESTED state
Date Sun, 03 Apr 2016 20:14:25 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15223494#comment-15223494
] 

Sudheesh Katkam commented on DRILL-4338:
----------------------------------------

Issuing control + C is cancellation only though sqlline. To issue a cancel through JDBC, use
the [Statement#cancel|https://docs.oracle.com/javase/7/docs/api/java/sql/Statement.html#cancel()]
method; I think sqlline maps control + C to the cancel method. So issuing a control + C in
your application is causing the connection to be [closed somewhat nicely|http://stackoverflow.com/questions/1434451/what-does-connection-reset-by-peer-mean].

Regarding the two observations:
(1) Drill logs the exception to note that the failure is due to connection drop; the admin
might be interested in this 'unusual' event.
(2) The query might end up in CANCELED or FAILED state. If Drill was sending data to the client
when it died, the query is failed because the client does not acknowledge receiving data.
Otherwise the query is cancelled.

There are two other things to investigate:
(1) The queries remain in CANCELLATION_REQUESTED state. Can you gather the jstack output of
the drillbit processes? This will help us track why the cancellation or failure is not fully
processed.
(2) If the bit that is the Foreman is killed, the queries hang. This is same issue as DRILL-3743.

> 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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