[IMPALA-571] Impala shell does not cancel query immediately

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: Impala 1.1.1
• Fix Version/s: Impala 1.2.1
• Component/s: Clients
• Labels: shell
• Assignee: Ishaan Joshi
• Reporter: Alan Choi
• Created: 29/Aug/13 18:22
• Updated: 28/Dec/15 17:43
• Resolved: 21/Nov/13 17:46

Description

For a big join query, such as:
select * from tpch.lineitem x, tpch.lineitem y where x.l_orderkey=y.l_orderkey;

Hitting Ctrl-C in the shell doesn't cancel the query immediately (i.e. more than a few sec).

The problem is that the Shell is in the middle of the Fetch RPC and can't process the Cancel.

When Impala return a "FINISHED" state, it's simply means it's finished planning. No result is available yet. So, the FETCH is blocked. While the shell is blocked on Fetch, it's not processing the Ctrl-C.

To work around, use the Impala debug webpage to cancel the query.

It is a serious issue. That means all BIG JOIN queries can't be cancelled until the first row has been returned.