pkuwm opened a new issue #503: Null returned for instance stoppable check when connection refused URL: https://github.com/apache/helix/issues/503 ``` $ curl -H "Content-Type: application/json" -X POST http://server:port/admin/v2/namespaces/myNamespace/clusters/myCluster/instances/myInstance/stoppable -d '{"selection_base": "zone_based", "max_instance": "2", "customized_values": "{}"}' null ``` Troubleshooting and getting exception stack: ``` Caused by: org.apache.http.conn.HttpHostConnectException: Connect to <hosts> failed: Connection refused (Connection refused) at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:156) at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:374) at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:393) at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236) at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186) 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 org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56) at org.apache.helix.rest.client.CustomRestClientImpl.post(CustomRestClientImpl.java:133) at org.apache.helix.rest.client.CustomRestClientImpl.getInstanceStoppableCheck(CustomRestClientImpl.java:76) at org.apache.helix.rest.server.service.InstanceServiceImpl.performCustomInstanceCheck(InstanceServiceImpl.java:227) at org.apache.helix.rest.server.service.InstanceServiceImpl.lambda$null$2(InstanceServiceImpl.java:168) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ... 1 more Caused by: java.net.ConnectException: Connection refused (Connection refused) at java.net.PlainSocketImpl.socketConnect(Native Method) 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.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:75) at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142) ... 18 more ``` Solution: we need to return a `StoppableCheck` object when connection refused.
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