Bug: When fetch chunk throw NPE, improve the error message
Status: Resolved | Priority: Major | Resolution: Fixed
Created: 03/Aug/21 09:32
Affects Version/s: 3.2.0

{code}
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$2.run(ThreadExecutorMap.java:74)
	at org.sparkproject.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.lang.Thread.run(Thread.java:748)
] to /10.128.137.103:53818; closing connection
java.nio.channels.ClosedChannelException
	at org.sparkproject.io.netty.channel.AbstractChannel$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)
{code}