I have increased my timeout to 1200s ( i.e spark.network.timeout=1200s) . Still I am getting netty error. This time error occurs on block replication.

17/02/24 09:10:21 ERROR TransportResponseHandler: Still have 1 requests outstanding when connection from ip-172-20-101-120.ec2.internal/172.20.101.120:46113 is closed
17/02/24 09:10:21 ERROR NettyBlockTransferService: Error while uploading block rdd_24_2312
java.io.IOException: Connection from ip-172-20-101-120.ec2.internal/172.20.101.120:46113 closed