### What changes were proposed in this pull request?
When channel terminated will call `connectionTerminated` and remove corresponding StreamState,
then all coming request on this StreamState will throw NPE like
```
2021-07-31 22:00:24,810 ERROR server.ChunkFetchRequestHandler (ChunkFetchRequestHandler.java:lambda$respond$1(146)) - Error sending result ChunkFetchFailure[streamChunkId=StreamChunkId[streamId=1119950114515,chunkIndex=0],errorString=java.lang.NullPointerException
at org.apache.spark.network.server.OneForOneStreamManager.getChunk(OneForOneStreamManager.java:80)
at org.apache.spark.network.server.ChunkFetchRequestHandler.processFetchRequest(ChunkFetchRequestHandler.java:101)
at org.apache.spark.network.server.ChunkFetchRequestHandler.channelRead0(ChunkFetchRequestHandler.java:82)
at org.apache.spark.network.server.ChunkFetchRequestHandler.channelRead0(ChunkFetchRequestHandler.java:51)
at org.sparkproject.io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:99)
at org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:61)
at org.sparkproject.io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:370)
at org.sparkproject.io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
at org.sparkproject.io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
at org.sparkproject.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500)
at org.sparkproject.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at org.sparkproject.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at org.sparkproject.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)
] to /ip:53818; closing connection
java.nio.channels.ClosedChannelException
at org.sparkproject.io.netty.channel.AbstractChannel$AbstractUnsafe.newClosedChannelException(AbstractChannel.java:957)
at org.sparkproject.io.netty.channel.AbstractChannel$AbstractUnsafe.write(AbstractChannel.java:865)
at org.sparkproject.io.netty.channel.DefaultChannelPipeline$HeadContext.write(DefaultChannelPipeline.java:1367)
at org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717)
at org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:709)
at org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:792)
at org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:702)
at org.sparkproject.io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:112)
at org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717)
at org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:709)
at org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:792)
at org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:702)
at org.sparkproject.io.netty.handler.timeout.IdleStateHandler.write(IdleStateHandler.java:302)
at org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717)
at org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:764)
at org.sparkproject.io.netty.channel.AbstractChannelHandlerContext$WriteTask.run(AbstractChannelHandlerContext.java:1104)
at org.sparkproject.io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
at org.sparkproject.io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
at org.sparkproject.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:497)
at org.sparkproject.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at org.sparkproject.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at org.sparkproject.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)
```
Since JVM will not show stack of NPE exception if it happen many times.
```
021-07-28 08:25:44,720 ERROR server.ChunkFetchRequestHandler (ChunkFetchRequestHandler.java:lambda$respond$1(146)) - Error sending result ChunkFetchFailure[streamChunkId=StreamChunkId[streamId=1187623335353,chunkIndex=11],errorString=java.lang.NullPoint
erException
] to /10.130.10.5:42148; closing connection
java.nio.channels.ClosedChannelException
```
Makes user confused.
We should improved this error message?
### Why are the changes needed?
Improve error message
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Closes#33622 from AngersZhuuuu/SPARK-36391.
Lead-authored-by: Angerszhuuuu <angers.zhu@gmaihu@gmail.com>
Co-authored-by: Angerszhuuuu <angers.zhu@gmail.com>
Signed-off-by: yi.wu <yi.wu@databricks.com>
b377ea26e2