2998402 - SDI error: Connection pool shut downcom.sap.hana.dp.adapter.sdk.AdapterException: http read error Context: java.lang.IllegalStateException: Connection pool shut down

framework_alert.trc shows:

2019-08-22 09:07:58,803 [ERROR] DPFramework | RequestHandlerThread.run [] - Connection reset
2019-08-22 09:07:59,256 [ERROR] MDSService | MDSListener.run [] - socket closed
2019-08-22 09:08:10,061 [ERROR] DPFramework | SocketListener.run [] - java.net.SocketException: socket closed
2019-08-22 09:08:10,096 [ERROR] DPFramework | HttpConnector.read [] - Failed to send message to server. Message [112:111:GET_AGENT_MSG:SDA:0:dpagent1_TZA-EC2-SAP-CC:null:null:0000C134-F409-ECBA-0000-000000000033:0:0:GET_AGENT_MSG:HttpHeaders :{agentRequest=post}].
2019-08-22 09:08:10,096 [ERROR] DPFramework | HttpConnector.read [] - java.lang.IllegalStateException: Connection pool shut downcom.sap.hana.dp.adapter.sdk.AdapterException: http read error Context: java.lang.IllegalStateException: Connection pool shut down
at org.apache.http.util.Asserts.check(Asserts.java:34)
at org.apache.http.pool.AbstractConnPool.lease(AbstractConnPool.java:191)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.requestConnection(PoolingHttpClientConnectionManager.java:268)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:176)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
at com.sap.hana.dp.adapter.framework.cloud.HttpConnector.readMessage(HttpConnector.java:660)
at com.sap.hana.dp.adapter.framework.cloud.HttpConnector.read(HttpConnector.java:598)
at com.sap.hana.dp.adapter.framework.core.RequestHandlerThread.run(RequestHandlerThread.java:79)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:805)

SAP Smart Data Integration

KBA , HAN-DP-SDI , SAP HANA smart data integration (SDI) , Problem