Get timeout error on seldon-container-engine if I set GUNICORN_WORKERS env

[kysersozelee]

Get timeout error on seldon-container-engine if I set GUNICORN_WORKERS environment variable(using seldonio/seldon-core-s2i-python36:1.1.0). Deleting GUNICORN_WORKERS works without any problem. How can I set up gunicorn?

seldon-container-engine error logs

org.springframework.web.client.ResourceAccessException: I/O error on POST request for "http://localhost:9000/predict": Read timed out; nested exception is java.net.SocketTimeoutException: Read timed out
	at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:751) ~[spring-web-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:717) ~[spring-web-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at org.springframework.web.client.RestTemplate.postForEntity(RestTemplate.java:470) ~[spring-web-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at io.seldon.engine.service.InternalPredictionService.queryREST(InternalPredictionService.java:493) ~[classes!/:1.0.1]
	at io.seldon.engine.service.InternalPredictionService.transformInput(InternalPredictionService.java:291) ~[classes!/:1.0.1]
	at io.seldon.engine.predictors.PredictiveUnitBean.transformInput(PredictiveUnitBean.java:257) ~[classes!/:1.0.1]
	at io.seldon.engine.predictors.PredictiveUnitBean.getOutputAsync(PredictiveUnitBean.java:134) ~[classes!/:1.0.1]
	at io.seldon.engine.predictors.PredictiveUnitBean$$FastClassBySpringCGLIB$$ddb0d27b.invoke(<generated>) ~[classes!/:1.0.1]
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:769) ~[spring-aop-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747) ~[spring-aop-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at org.springframework.aop.interceptor.AsyncExecutionInterceptor.lambda$invoke$0(AsyncExecutionInterceptor.java:115) ~[spring-aop-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:?]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:?]
	at java.lang.Thread.run(Unknown Source) [?:?]
Caused by: java.net.SocketTimeoutException: Read timed out
	at java.net.SocketInputStream.socketRead0(Native Method) ~[?:?]
	at java.net.SocketInputStream.socketRead(Unknown Source) ~[?:?]
	at java.net.SocketInputStream.read(Unknown Source) ~[?:?]
	at java.net.SocketInputStream.read(Unknown Source) ~[?:?]
	at org.apache.http.impl.io.SessionInputBufferImpl.streamRead(SessionInputBufferImpl.java:137) ~[httpcore-4.4.12.jar!/:4.4.12]
	at org.apache.http.impl.io.SessionInputBufferImpl.fillBuffer(SessionInputBufferImpl.java:153) ~[httpcore-4.4.12.jar!/:4.4.12]
	at org.apache.http.impl.io.SessionInputBufferImpl.readLine(SessionInputBufferImpl.java:280) ~[httpcore-4.4.12.jar!/:4.4.12]
	at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:138) ~[httpclient-4.5.10.jar!/:4.5.10]
	at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56) ~[httpclient-4.5.10.jar!/:4.5.10]
	at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259) ~[httpcore-4.4.12.jar!/:4.4.12]
	at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:163) ~[httpcore-4.4.12.jar!/:4.4.12]
	at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:157) ~[httpclient-4.5.10.jar!/:4.5.10]
	at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273) ~[httpcore-4.4.12.jar!/:4.4.12]
	at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125) ~[httpcore-4.4.12.jar!/:4.4.12]
	at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272) ~[httpclient-4.5.10.jar!/:4.5.10]
	at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186) ~[httpclient-4.5.10.jar!/:4.5.10]
	at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89) ~[httpclient-4.5.10.jar!/:4.5.10]
	at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110) ~[httpclient-4.5.10.jar!/:4.5.10]
	at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185) ~[httpclient-4.5.10.jar!/:4.5.10]
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83) ~[httpclient-4.5.10.jar!/:4.5.10]
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56) ~[httpclient-4.5.10.jar!/:4.5.10]
	at org.springframework.http.client.HttpComponentsClientHttpRequest.executeInternal(HttpComponentsClientHttpRequest.java:87) ~[spring-web-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48) ~[spring-web-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:53) ~[spring-web-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at org.springframework.http.client.InterceptingClientHttpRequest$InterceptingRequestExecution.execute(InterceptingClientHttpRequest.java:109) ~[spring-web-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at org.springframework.boot.actuate.metrics.web.client.MetricsClientHttpRequestInterceptor.intercept(MetricsClientHttpRequestInterceptor.java:93) ~[spring-boot-actuator-2.2.0.RELEASE.jar!/:2.2.0.RELEASE]
	at org.springframework.http.client.InterceptingClientHttpRequest$InterceptingRequestExecution.execute(InterceptingClientHttpRequest.java:93) ~[spring-web-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at org.springframework.http.client.InterceptingClientHttpRequest.executeInternal(InterceptingClientHttpRequest.java:77) ~[spring-web-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48) ~[spring-web-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:53) ~[spring-web-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:742) ~[spring-web-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
	... 16 more