java.lang.IllegalStateException: RpcEnv already stopped.

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java.lang.IllegalStateException: RpcEnv already stopped.
at io.netty.channel.AbstractChannelHandlerContext.fireChannelUnregistered(AbstractChannelHandlerContext.java:144)
at io.netty.channel.ChannelInboundHandlerAdapter.channelUnregistered(ChannelInboundHandlerAdapter.java:53)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:158)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelUnregistered(AbstractChannelHandlerContext.java:144)
at io.netty.channel.ChannelInboundHandlerAdapter.channelUnregistered(ChannelInboundHandlerAdapter.java:53)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:158)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelUnregistered(AbstractChannelHandlerContext.java:144)
at io.netty.channel.DefaultChannelPipeline.fireChannelUnregistered(DefaultChannelPipeline.java:739)
at io.netty.channel.AbstractChannel$AbstractUnsafe$8.run(AbstractChannel.java:659)
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.postgresql.core.PGStream.(PGStream.java:61)
at org.apache.spark.rpc.netty.Dispatcher.postMessage(Dispatcher.scala:159)
at org.apache.spark.rpc.netty.Dispatcher.postToAll(Dispatcher.scala:109)
at org.apache.spark.rpc.netty.NettyRpcHandler.connectionTerminated(NettyRpcEnv.scala:630)
at org.apache.spark.network.server.TransportRequestHandler.channelUnregistered(TransportRequestHandler.java:94)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:158)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelUnregistered(AbstractChannelHandlerContext.java:144)
at io.netty.channel.ChannelInboundHandlerAdapter.channelUnregistered(ChannelInboundHandlerAdapter.java:53)
at org.apache.spark.sql.execution.datasources.jdbc.JDBCRDD$$anonfun$getConnector$1.apply(JDBCRDD.scala:188)
at org.apache.spark.sql.execution.datasources.jdbc.JDBCRDD$$anonfun$getConnector$1.apply(JDBCRDD.scala:181)
at org.apache.spark.sql.execution.datasources.jdbc.JDBCRDD$.resolveTable(JDBCRDD.scala:121)
at org.apache.spark.sql.execution.datasources.jdbc.JDBCRelation.(JDBCRelation.scala:91)
at org.apache.spark.sql.execution.datasources.jdbc.DefaultSource.createRelation(DefaultSource.scala:60)
at org.apache.spark.sql.execution.datasources.ResolvedDataSource$.apply(ResolvedDataSource.scala:158)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:119)
at local_project.hawqload_0_1.HawqLoad.tJDBCInput_1Process(HawqLoad.java:1489)
at local_project.hawqload_0_1.HawqLoad.run(HawqLoad.java:1950)
at local_project.hawqload_0_1.HawqLoad.runJobInTOS(HawqLoad.java:1754)
at local_project.hawqload_0_1.HawqLoad.main(HawqLoad.java:1641)

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