Kihwal Lee created HADOOP-9229: ---------------------------------- Summary: IPC: Retry on connection reset or socket timeout during SASL negotiation Key: HADOOP-9229 URL: https://issues.apache.org/jira/browse/HADOOP-9229 Project: Hadoop Common Issue Type: Improvement Components: ipc Affects Versions: 3.0.0, 2.0.3-alpha, 0.23.7 Reporter: Kihwal Lee
When an RPC server is overloaded, incoming connections may not get accepted in time, causing listen queue overflow. The impact on client varies depending on the type of OS in use. On Linux, connections in this state look fully connected to the clients, but they are without buffers, thus any data sent to the server will get dropped. This won't be a problem for protocols where client first wait for server's greeting. Even for clients-speak-first protocols, it will be fine if the overload is transient and such connections are accepted before the retransmission of dropped packets arrive. Otherwise, clients can hit socket timeout after several retransmissions. In certain situations, connection will get reset while clients still waiting for ack. We have seen this happening to IPC clients during SASL negotiation. Since no call has been sent, we should allow retry when connection reset or socket timeout happens in this stage. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira