Hi, I am investigating the most common errors we see in our Impala Cluster. The most common is with query status = 'Session Closed'
I can see from the code (https://github.com/apache/impala/blob/72c9370856d7436885adbee3e8da7e7d9336df15/be/src/service/impala-server.cc#L1435) that it is set when Session is closed and this happens when connection is closed (ConnectionEnd<https://github.com/apache/impala/blob/72c9370856d7436885adbee3e8da7e7d9336df15/be/src/service/impala-server.cc#L2094>) and this is called when Thrift transport is closed<https://github.com/apache/impala/blob/82f753e3044bd2482f35d137fbb28516fc0ef86c/be/src/rpc/TAcceptQueueServer.cpp> (and query has not completed or failed in some way it would be marked as Session Closed Does this mean that the remote end has simply dropped the connection ? E.g there has been network interruption or someone killed (SIGKILL) the remote process ? We have (TCP) load balancer (HaProxy) and I am wondering if for example Load Balancer tcp timeout can cause such error. Or can client socket timeout cause it? I'd be grateful for any insides into the semantics of when "Session Closed" is set. Thanks, Antoni
