[IMPALA-718] ExecuteStatement (HS2) and query (beeswax) are supposed to be non-blocking RPC but for DDL, they block

• Type: Sub-task
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: Impala 1.1.1
• Component/s: Backend
• Labels: incompatibility
• Target Version: Product Backlog
• Assignee: Unassigned
• Reporter: Alan Choi
• Created: 19/Dec/13 02:26
• Updated: 20/Feb/18 06:50

Description

Certain operations, such as

1. LOAD DATA
2. REFRESH
3. Invalidate Metadata
(4. and potentially compute stats)

can be long running DDL. These operations blocks on ExecuteStatement (HS2) or query (beeswax).

Because Hue expects all operations as async, when an user issues such a long running DDL from Hue, Hue might timeout. Also, Impala does not have progress reporting on these operations. The lack of progress reporting makes it hard for our user to tell if it's still running or not.

Issue Links

• is blocked by: IMPALA-2568 ExecuteStatement RPC (and beeswax query() RPC) should not block
• relates to: IMPALA-5216 Admission control queuing should be asynchronous