[GitHub] [helix] pkuwm opened a new issue #503: Null returned for instance stoppable check when connection refused

[GitBox <gi...@apache.org>]

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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