I have a project on google app engine technologies using datastore, written in py38
For local development, I use dev_appserver.py and also a google data warehouse emulator (https://cloud.google.com/sdk/gcloud/reference/beta/emulators/datastore/start)
The project has been in successful development for more than 3 months - the local data warehouse emulator has been working. It also worked yesterday. But today I ran into a Stream Error problem when trying to access the database. I didn't change any settings, so it just had to work and not cause problems.
You can see the full traceback below
io.grpc.netty.NettyServerHandler onStreamError
[datastore] WARNING: Stream Error
[datastore] io.netty.handler.codec.http2.Http2Exception$StreamException: Stream closed before write could take place
[datastore] at io.netty.handler.codec.http2.Http2Exception.streamError(Http2Exception.java:149)
[datastore] at io.netty.handler.codec.http2.DefaultHttp2RemoteFlowController$FlowState.cancel(DefaultHttp2RemoteFlowController.java:480)
[datastore] at io.netty.handler.codec.http2.DefaultHttp2RemoteFlowController$1.onStreamClosed(DefaultHttp2RemoteFlowController.java:104)
[datastore] at io.netty.handler.codec.http2.DefaultHttp2Connection.notifyClosed(DefaultHttp2Connection.java:356)
[datastore] at io.netty.handler.codec.http2.DefaultHttp2Connection$ActiveStreams.removeFromActiveStreams(DefaultHttp2Connection.java:1000)
[datastore] at io.netty.handler.codec.http2.DefaultHttp2Connection$ActiveStreams.deactivate(DefaultHttp2Connection.java:956)
[datastore] at io.netty.handler.codec.http2.DefaultHttp2Connection$DefaultStream.close(DefaultHttp2Connection.java:512)
[datastore] at io.netty.handler.codec.http2.DefaultHttp2Connection$DefaultStream.close(DefaultHttp2Connection.java:518)
[datastore] at io.netty.handler.codec.http2.Http2ConnectionHandler.closeStream(Http2ConnectionHandler.java:589)
[datastore] at io.netty.handler.codec.http2.DefaultHttp2ConnectionDecoder$FrameReadListener.onRstStreamRead(DefaultHttp2ConnectionDecoder.java:352)
[datastore] at io.netty.handler.codec.http2.Http2InboundFrameLogger$1.onRstStreamRead(Http2InboundFrameLogger.java:80)
[datastore] at io.netty.handler.codec.http2.DefaultHttp2FrameReader.readRstStreamFrame(DefaultHttp2FrameReader.java:516)
[datastore] at io.netty.handler.codec.http2.DefaultHttp2FrameReader.processPayloadState(DefaultHttp2FrameReader.java:260)
[datastore] at io.netty.handler.codec.http2.DefaultHttp2FrameReader.readFrame(DefaultHttp2FrameReader.java:160)
[datastore] at io.netty.handler.codec.http2.Http2InboundFrameLogger.readFrame(Http2InboundFrameLogger.java:41)
[datastore] at io.netty.handler.codec.http2.DefaultHttp2ConnectionDecoder.decodeFrame(DefaultHttp2ConnectionDecoder.java:118)
[datastore] at io.netty.handler.codec.http2.Http2ConnectionHandler$FrameDecoder.decode(Http2ConnectionHandler.java:390)
[datastore] at io.netty.handler.codec.http2.Http2ConnectionHandler.decode(Http2ConnectionHandler.java:450)
[datastore] at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:502)
[datastore] at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:441)
[datastore] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:278)
[datastore] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
[datastore] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
[datastore] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
[datastore] at io.gapi.emulators.netty.HttpVersionRoutingHandler.channelRead(HttpVersionRoutingHandler.java:103)
[datastore] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
[datastore] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
[datastore] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
[datastore] at io.netty.handler.logging.LoggingHandler.channelRead(LoggingHandler.java:241)
[datastore] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
[datastore] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
[datastore] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
[datastore] at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
[datastore] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
[datastore] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
[datastore] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
[datastore] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
[datastore] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:656)
[datastore] at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:591)
[datastore] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:508)
[datastore] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:470)
[datastore] at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:909)
[datastore] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[datastore] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[datastore] at java.base/java.lang.Thread.run(Thread.java:834)
The data warehouse emulator is running on localhost:8081. In the app engine application, variables for connection are set during local development. The web application itself runs on localhost:8080. As I described above, I didn't change anything - it just stopped working
