[IMPALA-7555] impala-shell can hang in connect in certain cases

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 3.1.0
• Fix Version/s: Impala 3.1.0
• Component/s: Clients
• Epic Color: ghx-label-6
• Assignee: Anuj Phadke
• Reporter: Anuj Phadke
• Created: 11/Sep/18 05:58
• Updated: 07/Dec/18 15:45
• Resolved: 15/Nov/18 00:50

Description

1. Open a random listening port using netcat (nc -l 1234). 
2. When I connect through impala-shell to this port, it hangs in the connect call. I think this is similar to impala-shell connecting a load balancer port and the connection between LB and impala going down.
3. Connect in impala-shell also calls PingImpalaService which does more than a normal TCP connect and can hang. Since there is no timeout set on this socket, connect can hang in this call.
4. We should set a timeout on the client socket to prevent hangs during the connect phase of session creation.

Issue Links

• is related to: IMPALA-6071 impala-shell hang during Kerberos authentication
• is related to: IMPALA-3280 impala-shell hangs if started with --ssl option
• relates to: IMPALA-7312 Non-blocking mode for Fetch() RPC
• relates to: IMPALA-2568 ExecuteStatement RPC (and beeswax query() RPC) should not block